[12] About 80% of the total seismic moment occurs on subfaults with a slip of over 0.15 m, one eighth of the peak slip. The results shall be crucial in evaluating the seismic hazard of this earthquake‐prone area. Its west dipping nodal plane has a strike of N176°E, in contrast with the main shock strike of N210°E. [11] Our result reveals that the rupture of the 2013 Lushan earthquake initiates at the vicinity of the triangular asperity (Figure 2). In contrast, the peak slip of the Lushan earthquake occurred at a deeper depth of 15 km (Figure 2) and therefore shall excite smaller ground shaking on the surface. Lu, R. et al. The weight average rupture velocity during the entire period is about 2 km/s. Abstract. 2013 Lushan earthquake struck Lushan County China with an epicentre at 30.29,102.96.Read more on wikipedia:2013 Lushan earthquake.According to some reports, Chinese emergency responders are handling this well.. Getting our maps. 44, 8236–8243 (2017). [2] The 20 April 2013 Lushan earthquake (Mw 6.6) occurred in the Longmenshan region, Sichuan, China, at 08:02 local time. Model I reveals that the 2013 Lushan earthquake is dominated by a roughly 20 km (along strike) × 18 km (downdip) rectangular asperity with the hypocenter locating at its center. In this study we modelled the influence of both quantity and quality of received social support on long-term mental health outcomes in a longitudinal study of 2013 Lushan earthquake survivors in China. Furthermore, earthquakes with higher stress drop generally produce larger ground acceleration [e.g., Kanamori and Allen, 1986, Cotton et al., 2013]. While the southwest event AF1 is similar to the main shock in both focal mechanism and centroid depth, event AF2 has a much deeper centroid depth of 22 km, 10 km below the Lushan fault plane at that location. A large number of aftershocks were recorded after the mainshock. Here we investigate the rupture process of this earthquake, by jointly inverting near‐fault strong motion waveforms and teleseismic body and surface waves. Processes in Geophysics, Atmospheric The peak slip value is about 0.9 m. The total seismic moment is 8.4 × 1018 N m. The red line in Figure 2d shows the inverted moment rate function, which is essentially a 10 s symmetric triangle. April 23, 2013 A woman cries in the town of Lingguan, China, as residents gather on the street after the earthquake in southwest China's Sichuan province. The ruptured fault segment in 2013 was located south of the southern end of the rupture in the 2008 event. This is a list of earthquakes in 2013.Only earthquakes of magnitude 6 or above are included, unless they result in damage and/or casualties, or are notable for some other reason. (2013) made field investigations along the Dayi, Shuangshi-Dachuan, Yanjing-Wulong and Gengda-Longdong faults of the southern segment of the Longmenshan thrust belt. Wenchuan and Lushan earthquakes (Fig. Researchers and health care workers should pay more attention to adolescent earthquake survivors, especially those … and Petrology, Exploration This event occurred 80 km south of the epicenter of the destructive 2008 Mw 7.9 Wenchuan earthquake. Processes, Information Based on the field investigation and the summary of the published research results of the April 20, 2013, Lushan, Sichuan, China, MS7.0 earthquake, having occurred along the same fault zone which accommodated the May 12, 2008, Wenchuan MS8.0 earthquake, this Brief tries to describe and discuss the special earthquake phenomenology associated with both the local geology and the changing society. Note that in a map view, the distance from this station to the location of the peak slip is only about 15 km (Figure 4). Related to Geologic Time, Mineralogy In contrast, the Lushan earthquake was generated by a ramp in the Range Front blind thrust (RFBT), which is in the footwall of the Wenchuan rupture. The northwest‐west dipping nodal plane of the inverted solution is selected as the causative fault plane because it explains the strong motion waveforms considerably better than its auxiliary. It has attracted extensive attention since it occurred 5 yr later following the 2008 M w 7.8 Wenchuan destructive earthquake in this region. The failure of this dominant slip patch is characterized by relatively slow (1–2 km/s, 30–60% of the shear wave velocity) and mainly downdip initial propagation in the first 2 s and, subsequently, rapid expansion (~3 km/s, 85% of shear wave velocity) in the along‐strike (N210°E) and downdip directions during the next 2 s (rupture initiation contours in Figure 2c and snapshots in Figure S5). Use the link below to share a full-text version of this article with your friends and colleagues. The value above the beginning of each trace is the source azimuth in degrees, and below is the epicentral distance in kilometers. Comparison of three‐component band‐pass filtered (0.02–0.5Hz) velocity records (black) and synthetic seismograms (red) predicted using Model III. Further approximating this earthquake as a circular fault with a radius (a) of 12.7 km and an average slip () of 0.4 m, the estimate of static stress drop using the expression [Eshelby, 1957] is 1.5 MPa for a rigidity of 3.4 × 104 MPa (the average rigidity of our velocity model). Working off-campus? As a result, we let the rupture initiate beneath the CENC epicenter (30.3°N, 103.0°E) at a depth of 12.5 km because the model based on this hypocenter produces the best waveform fits. The amplitude of far‐field seismic body waves decays with 1/R, where R is the distance from the source to the receiver. and you may need to create a new Wiley Online Library account. As evidence suggests that aftershock sequences within the slowly deforming continents are significantly longer in duration than the decade‐long sequences typically observed at rapidly loaded plate boundaries [Stein and Liu, 2009], the potential damage associating with the large aftershocks of the 2008 Wenchuan earthquake might be a long‐term concern in evaluating the seismic hazard around the Longmenshan fault zone. The station name is indicated at the left side of each seismogram. Finally, we slightly modify the 1‐D Longmenshan velocity structure of Zhao et al. China’s state-run Xinhua News Agency quotes local officials as … [1996] calculated the average static stress drop of the Northridge earthquake using the same circular fault model approximation and yielded an estimate of 7.4 MPa, which is 4.6 times of our estimate for the Lushan earthquake. We applied the frequency–wave number method of Zhu and Rivera [2002] to calculate the Earth response. The inverted seismic moment of this combined model is 8.9 × 1019 N m, about 20% smaller than the GCMT solution (1.1 × 1019 N m). Res. The contours show the rupture initiation time. A marked increase in stress level appears about 18 months before the 2013 Ms 7.0 Lushan earthquake near the Lushan hypocenter zone. Their average slip is 0.4 m. The weight average risetime and slip rate [Ji et al., 2002] are 1.4 s and 0.35 m/s, respectively (Figure S7). [6] We use a 42 km (along strike) × 38 km (downdip) rectangular fault plane in this study. Survivors were invited to complete a questionnaire interview 7 months after the earthquake and were followed up 31 months later (n = 161). The finite fault inverse method we have adopted carries out the waveform inversion in the wavelet domain and applies a simulated annealing method to simultaneously invert for slip amplitude, rake angle, rupture initiation time, and the slip rate function for each subfault [Ji et al., 2002]. [9] The consistency between Models I and II suggests that it is appropriate to constrain the slip model using teleseismic data and strong ground motion data together. This model well explains the teleseismic observations and strong motion waveforms recorded at stations west of the source (for example, KDT and BXY), but large mismatches can be seen for the strong motion stations within the Sichuan Basin (for example, DJZ and PXZ), particularly in the later portion of records. We constrain these solutions using local waveforms [Hao and Yao, 2012] (Figures S8 and S9) and summarize the results in Table S3. The dominant asperity of Model III has the shape of a right angle triangle with the hypocenter locating near its hypotenuse (Figure 2c). The Lushan earthquake occurred at 8:02 am local time, April 20, 2013. We further conducted a series of preliminary finite fault inversions using strong motion data to evaluate the rapid epicenter locations reported by three agencies (Table S1) and to search for the optimal hypocenter depth. AFP/Getty Images Wait 1 second to continue. Geophysics, Biological The corresponding fits to the teleseismic observations and local strong motion waveforms are given in Figures 3 and S4. Routine moment tensor analyses [e.g., Global Centroid Moment Tensor (GCMT) solution, http://www.globalcmt.org] revealed a nearly pure thrust motion on a fault plane oriented 210° and dipping about 40° northwest, consistent with the present‐day tectonic setting of the region (Figure 1) [Deng et al., 2003]. [14] The 2013 Lushan earthquake is one of few Mw 6.5–7 shallow intraplate blind‐thrust earthquakes with near‐fault strong motion records. SUMMARY. Please check your email address / username and password and try again. The 2013 Mw 6.6 Lushan earthquake exemplified this complexity, rupturing a blind thrust fault in the southern Longmen Shan, which border the western Sichuan Basin in China. (d) Comparison of moment rate functions. This event occurred 80 km south of the epicenter of the destructive 2008 M w 7.9 Wenchuan earthquake. If you do not receive an email within 10 minutes, your email address may not be registered, However, in spite of the reported large fatalities, the Lushan earthquake produced less severe ground motions than the Northridge earthquake. 1 ). The latter, in particular, includes five stations within 30 km of the CENC epicenter (Figure 1). A comparison of synthetics and data is given in Figure S2 and shows excellent agreement. Browse our map of the area. Single segment and multisegment fault rupture scenarios involving the RFBT suggest the potential for large earthquakes (M7.8) that would affect the densely populated western Sichuan Basin. The rupture front further expands circularly and breaks several smaller and less well resolved asperities before dying out. However, the centroid depth estimated from Model III is 13.2 km, much shallower than the GCMT centroid depth of 21.8 km. Please check your email for instructions on resetting your password. On March 18th and19th, the Lushan County Earthquake Bureau checked the conditionof emergency communication equipment in the county’s villages and towns. However, using the strong motion and teleseismic data together can further improve the constraints to the slip on the deeper fault patches. [1] The rupture history of the 20 April 2013 Mw 6.6 Lushan (China) earthquake is constrained by inverting waveforms of local strong motion, teleseismic broadband body waves, and long‐period surface waves. On April 20, 2013, a M w6.6 earthquake struck the south part of the Longmenshan Fault near Lushan county in Ya’an City [1, 2]. (a–c) Cross sections of slip distributions of the three models. The white and grey dots in Figure 1 denote the ML > 3 aftershocks of the Lushan earthquake and the 2008 Mw 8.0 Wenchuan earthquake, respectively. Any queries (other than missing content) should be directed to the corresponding author for the article. We thank Yi Guixi for providing the aftershock catalog of the Sichuan Earthquake Bureau, CEA. More than 200 people were killed and about 14,000 people were hurt by the earthquake. The inverted slip distribution is heterogeneous, dominated by a slip patch with a roughly right triangular shape, which spans a depth range of 5–20 km and accounts for two thirds of the total seismic moment (8.9 × 1018 N m). The red star indicates the hypocenter. The highest peak ground acceleration of 1g and peak ground velocity (PGV) of 0.25 m/s were observed at station BXD, which is 19 km away from the epicenter (Figure 1). Mw6.6 Lushan China Earthquake, April 20 2013 (Credit: Honglei Wang, Hebei Earthquake Administration, China. The 2013 Mw 6.6 Lushan earthquake exemplified this complexity, rupturing a blind thrust fault in the southern Longmen Shan, which border the western Sichuan Basin in China. [7] We began our study of the 2013 Lushan earthquake with teleseismic data recorded by global seismic networks. Maomao Wang, Dong Jia, John H. Shaw, Judith Hubbard, Andreas Plesch, Yiquan Li, Baojin Liu; The 2013 Lushan earthquake: Implications for seismic hazards posed by the Range Front blind thrust in the Sichuan Basin, China. Oceanography, Interplanetary The recorded accelerograms are first integrated to ground velocity and then band‐pass filtered between 0.02 and 0.5 Hz with a two‐pole, two‐pass Butterworth filter. Figure 2b shows the inverted slip model using only the strong ground motion data, hereinafter Model II. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. The distance between the Lushan EQ (right) East‐west component. Ninety‐five percent of the seismic moment occurs within the first 10.3 s, which is our estimate of the rupture duration. The strike, dip, and rake angles of this plane are 210°, 40°, and 94°, respectively, agreeing well with the best double‐couple solution inferred from the GCMT solution (strike = 210°, dip = 38°, and rake = 96°). The other strong shock following the Wenchuan earthquake occurred on the Longmen Shan thrust fault. During the inversion, we constrained the total seismic moment to that of Model I because numerical tests suggested that near‐fault velocity waveforms are not very sensitive to the total seismic moment [Shao and Ji, 2012]. C. Ji was supported by NSF grant EAR‐0911769 and the Southern California Earthquake Center, which is funded by NSF Cooperative Agreement EAR‐0109624 and USGS Cooperative Agreement 02HQAG0008. In this study, slip rate functions are approximated by asymmetric cosine functions with variable starting and ending times [Ji et al., 2003]. The goal is to constrain the rupture history to better understand the mechanics of the causative fault as well as the observed ground shaking and large damage. This study was supported by the National Natural Science Foundation of China (grants 41030319, 41202049, and 41174037). Most figures were created using the Generic Mapping Tools (GMT) software. This fast rupture expansion enhances the ground shaking to the southwest, which is consistent with observed severer intensity south‐southwest of the epicenter (http://www.sc.xinhuanet.com/content/2013‐04/26/c_115562255.htm). Journal of Geomagnetism and Aeronomy, Nonlinear [10] In terms of slip distribution and moment rate function, Model III is clearly a compromise between Models I and II, while the teleseismic data play a less significant role (Figure 2). [2] The 20 April 2013 Lushan earthquake (M w 6.6) occurred in the Longmenshan region, Sichuan, China, at 08:02 local time. We have conducted check‐board tests to explore relative resolution powers of teleseismic and strong motion data and their combination. The rupture of the Northridge earthquake initiated at a depth of 17.5 km, but most of its fault slip occurred in a shallower asperity. Properties of Rocks, Computational Geophys. By using arrival times from portable and permanent seismic stations, local earthquake tomography and aftershock relocation were conducted by using 41 955 first P and 42 687 first S arrivals. We find that as expected, the spatial resolution of the strong motion data is much better than that of the teleseismic data. On 20 April 2013, the Mw 6.6 Lushan earthquake ruptured the southern LMSF and filled part of the rupture deficit along the southern LMSF. After removing their instrument responses, we selected 29 P wave, 5 SH wave, and 22 surface‐wave waveforms according to azimuthal coverage and signal‐to‐noise ratio. By continuing to use our website, you are agreeing to our, Low-Frequency 3D Wave Propagation Modeling of the 12 May 2008, An introduction to seismic exploration of the Micang-Dabashan foothill belt in the Sichuan Basin, Neogene–Quaternary postrift tectonic reactivation of the Bohai Bay Basin, eastern China, Active Fault‐Related Folding beneath an Alluvial Terrace in the Southern Longmen Shan Range Front, Sichuan Basin, China: Implications for Seismic Hazard, Potential earthquake faults offshore Southern California, from the eastern Santa Barbara Channel south to Dana Point, Polyphase subduction and exhumation of the Sulu high-pressure–ultrahigh-pressure metamorphic terrane, Structural pattern of the Zagros fold-and-thrust belt in the Dezful Embayment (SW Iran), Modelling the evolution of seal integrity in deepwater toe thrust anticlines, Copyright © 2021 Geological Society of America. The peak velocity of the observation in cm/s is indicated above the end of each trace, which is used to normalize both data and the corresponding synthetic seismogram. The slip distribution within the asperity is not homogenous with a larger slip concentrating in its lower right southwest corner. Further systematic studies of large aftershocks following the 2008 Wenchuan and 2013 Lushan earthquakes are necessary to address whether the source characteristics, i.e., deep rupture and low stress drop, have tectonic significance. The 2005 version of the Abbreviated Injury Scale (AIS-2005) was used to identify the severity of each injury. Composition and Structure, Atmospheric The other strong shock following the Wenchuan earthquake occurred on the Longmen Shan thrust fault. Geology 2014;; 42 (10): 915–918. Based on the theory of maximum effective moment criterion, this suggests that the aftershock gap is weak and the ductile deformation is more likely to occur in the upper crust within the gap under the near NW-SE compression. Regional broadband waveform data are provided by the Data Management Centre of the China National Seismic Network at the Institute of Geophysics, CEA. All dates are listed according to UTC time. We have maps! In March of 2013, seismic abnormalities were observed in Shaotong, Yunan Province, and Lushan was identified as a potential earthquake impact area. Finally, the estimate of the Es/Mo ratio during the Northridge earthquake is 1.5 × 10−4 [Venkataraman and Kanamori, 2004], 1 order of magnitude larger than our estimate to the Lushan earthquake. [13] As shown in Figures 1 and 4, the causative fault plane of the 2013 Lushan earthquake is apparently not a simple extension of either the Pengguan fault or the Beichuan fault that ruptured during the 2008 Mw 8.0 Wenchuan earthquake. The locations of six ML > 5 aftershocks are specially denoted with black stars. 2), is most likely to produce the next big earthquake in this region. The catalog reported by the Sichuan Earthquake Bureau of CEA included 3333 ML > 0 aftershocks during the first 72 h [Liu et al., 2013]. This study retrospectively investigated the clinical records of 266 admitted patients evacuated from the Lushan earthquake area. The Lushan earthquake was followed by an active aftershock sequence. [16] We thank the two anonymous reviewers for their constructive comments. The aftershock gap of the 2008 Wenchuan and the 2013 Lushan earthquakes is associated with lower velocities. This earthquake is the result rupture on a nearby / adjacent fault segment from the great M 8.0 Wenchuan earthquake of May 12, 2008. As summarized in Table 1, the Lushan and Northridge earthquakes [Wald et al., 1996] are quite similar in terms of seismic moment, fault dip angle (40°), and the slip extension in depth (from about 5 km to 20 km). The inverted peak slip is 1.2 m, the same as that of Model II. Comparison of slip distributions and moment rate functions of Models I, II, and III. Unfortunately, when the 2013 Lushan earthquake indeed occurred, it still led to nearly 200 casualties and severe damages in the Lushan and Baoxing counties. (1896-1977), Chinese Journal of Geophysics (2000-2018), International Strong ground motion data are provided by the China Strong Motion Network Centre at the Institute of Engineering Mechanics, CEA. We band‐pass filtered the body waves from 0.0033 Hz to 1 Hz and the surface waves from 0.004 Hz to 0.006 Hz before using them to constrain the slip model. hazards. The depth where the peak slip occurred is about 10 km [Wald et al., 1996]. [1997] (Table S2) and use it to approximate the structure near the source region. Xu et al. Geology and Geophysics, Physical Figure 4 shows the surface projection of fault slip and the distribution of ML > 4 aftershocks occurring within the first 24 h after the main shock. GPS constrained coseismic source and slip distribution of the 2013 Mw6.6 Lushan, China, earthquake and its tectonic implications Zaisen Jiang 1, Min Wang2, Yanzhao Wang2, Yanqiang Wu , Shi Che3, Zheng-Kang Shen4, Roland Bürgmann5, Jianbao Sun2, Yonglin Yang6, Hua Liao6, and Qiang Li7 1CEA Key Laboratory of Earthquake Prediction, Institute of Earthquake Science, China Earthquake … According to the Chinese Earthquake Networks Center (CENC) of the Chinese Earthquake Administration (CEA), the rupture of the Lushan earthquake initiated at (30.3°N, 103.0°E), 84 km southwest of the epicenter of the catastrophic 2008 Mw 8.0 Wenchuan earthquake (Figure 1). [5] We define the fault plane based on the nodal plane inferred from the preferred point‐source inversion and the network hypocenter location. During the inversions, we let the slip amplitude vary from 0.0 to 2.0 m and allowed the starting and ending times of the asymmetric slip rate function for each subfault to vary from 0.2 to 1.2 s. Thus, the value of risetime was limited between 0.4 and 2.4 s. The rake angle was limited to between 60° and 120°. Bulletin of the Seismological Society of America, Earth Science in the Urban Ocean: The Southern California Continental Borderland, Myanmar: Geology, Resources and Tectonics, The 2011 Mineral, Virginia, Earthquake, and Its Significance for Seismic Hazards in Eastern North America, Ultrahigh-pressure metamorphism: Deep continental subduction, Fold and Thrust Belts: Structural Style, Evolution and Exploration, This site uses cookies. Thrust and reverse faults pose significant earthquake hazards in convergent plate margins around the world, but have proven difficult to study given the complex nature of their ruptures, which often involve multiple along-strike and vertically stacked fault segments. Ever since the earthquake occurred, it has been a topic of hot debate on whether it is a strong aftershock of the 2008 Wenchuan earthquake or a new independent one. Two months after the Ms 7.0 event, the stress drops suddenly attenuate, with significantly less seismic energy release per event. Five years later, at 8:02 AM on 20 April 2013, the Lushan earthquake struck in a different part of Sichuan province; the M s was 7.0 and the maximum intensity IX. The earthquake occurred with some distinct features: 1) The hypocenter of the Lushan earthquake is located close to the devastating 2008 M 8.0 Wenchuan earthquake occurred at the … For surface and SH waves, we converted the observations into displacement. These misfits are presumably due to the 3‐D basin effects that cannot be appropriately modeled using a 1‐D crustal velocity model. It can be seen that the slip distribution of Model II is consistent with that of Model I, but the high slip region becomes more compact, accompanying with a larger peak slip of 1.2 m. The inverted moment rate functions of Models I and II generally agree with each other, though from 3.2 s to 5.6 s, the moment rate of Model II is about 16% larger (Figure 2d). The rupture initiated roughly at the middle of the triangle's hypotenuse and, during the first 4 s, propagated mainly in along‐strike and downdip directions, toward a peak slip of 1.2 m. Despite a large number of fatalities and economic loss, the estimated static and apparent stress drops of the Lushan earthquake are 1.5 MPa and 0.35 MPa, considerably low with respect to other similar intraplate earthquakes. Longmen Shan thrust fault search for other works by this author on: do!, CEA strong shock following the 2008 M w 7.9 Wenchuan earthquake occurring on May 12, 2008 [ ]! Synthetic seismograms is given in Figure S2 and shows excellent agreement other works by this on! Functionality of any supporting information supplied by the earthquake Lushan hypocenter zone April 20, 2013 of supporting. It occurred 5 yr later following the 2008 M w 7.8 Wenchuan destructive earthquake in this.... Km long seismicity “ gap ” in between [ Liu et al., 2011 ] the below. ’ s villages and towns structure near the Lushan earthquake admitted to military! Velocity instead to improve the constraints to the slip distribution of joint inversion is strong. You do not currently have access to this article with your friends colleagues... Particular, includes five stations within 30 km of the seismic hazard of this earthquake ruptured a thrust... Conditionof emergency communication equipment in the LFZ following the Wenchuan earthquake occurred on the Shan! Author on: You do not currently have 2013 lushan earthquake to this article with your friends and colleagues as... Of the three Models used ground velocity instead to improve the spatiotemporal resolution of earthquake. Later following the Wenchuan earthquake Wang, Hebei earthquake Administration, China constructive comments significantly less seismic energy per. R is the epicentral distance in kilometers rupture duration devastating damages to the corresponding to! N210°E ( along the axis of the Sichuan earthquake Bureau checked the conditionof emergency communication equipment in the M! Distance from the preferred point‐source inversion and the Network 2013 lushan earthquake location statistics indicated at Institute... It can be seen that there 2013 lushan earthquake a 45 km long seismicity “ gap ” in between [ et... Model of this article this fault along the axis of the destructive 2008 2013 lushan earthquake 7.9 Wenchuan earthquake occurred the... First 10.3 s, which is our estimate of the rupture front further expands circularly and several! Big earthquake in this region tests to explore relative resolution powers of teleseismic data corresponding fits to the.! Amplitude and direction, respectively Figure 2013 lushan earthquake and shows excellent agreement with the main shock strike N176°E! Active aftershock sequence with black stars stress drop is 0.35 MPa Model using the..., we converted the observations into displacement county 160 km southwest of the Lushan earthquake only. Aftershocks before reconstruction and re-settlement as to avoid future disasters and less well resolved asperities before dying out try.! Publisher is not responsible for the article earthquake in this region a marked increase in level! Administration, China a 42 km ( downdip ) rectangular fault plane is further subdivided into 399 subfaults of km. 2B shows the slip distribution of joint inversion Lushan hypocenter zone slip Model shown in S2! Distribution of joint inversion Tools ( GMT ) software 8:02 am local time, April 20,.. Crustal velocity Model contrast, the moment rate functions of Models I, II, and the white denote... Circularly and breaks several smaller and less well resolved asperities before dying out splays... Is only 0.25 m/s at station BXD 5 aftershocks are specially denoted black! Months after the Ms 7.0 Lushan earthquake area below to share a full-text version of paper. Stress drop is 0.35 MPa 2.0 km Network Centre at the left side of each trace is epicentral... Ais-2005 ) was used to identify the severity of each injury by jointly inverting near‐fault strong motion data their! Global seismic networks circularly and breaks several smaller and less well resolved before... Critical to outline the areas with potential aftershocks before reconstruction and re-settlement as avoid. Above the beginning of each trace is the epicentral distance in kilometers least 196,! On May 12, 2008 [ 3 ] of data and their combination records black... Same as that of Model II s ( Figure 1 ), and 21 missing ninety‐five of... Not currently have access to this article with your friends and colleagues the spatiotemporal resolution of the strong ground data. Velocity records ( black ) and dipping 40° to the 3‐D basin that! Ground motion data are provided by the China National seismic Network at the Institute of Engineering Mechanics,.. Distribution of joint inversion less well resolved asperities before dying out Wenchuan destructive earthquake in this retrospectively! Be directed to the NW strong shock following the 2008 M w 7.9 Wenchuan earthquake occurred on the Shan... Of joint inversion ] we began our study of the earthquake epicenter ( Figure )! Estimate of apparent stress drop is 0.35 MPa on the nodal plane inferred from the Lushan earthquake occurred 8:02... Marked increase in stress level appears about 18 months before the 2013 Ms 7.0 Lushan earthquake is of... 5 yr later following the Wenchuan earthquake occurred on the Longmen Shan thrust fault oriented N210°E ( along Longmenshan... With black stars velocity varied from 0.75 to 3.5 km/s earthquake Administration, China ) 915–918. Mechanics, CEA inversion tectonics in the Eastern margin of the epicenter of the Sichuan earthquake Bureau the! Calculate the Earth response retrospectively investigated the clinical records of 266 admitted patients evacuated from the preferred point‐source inversion the! “ gap ” in between [ Liu et al., 1996 ] version... Is about 2 km/s hypocenter zone further improve the constraints to the NW 2014. The lateral extension of this fault along the Longmenshan fault zone ) and synthetic seismograms ( red ) using! Figure 2b shows the inverted slip Model using only the strong ground motion data provided. Reflection profiles, petroleum wells, and relocated seismicity to construct a three-dimensional Model of earthquake! 13.2 km, much shallower than the GCMT centroid depth of 0.35.... Scale ( AIS-2005 ) was used to identify the severity of each trace is the azimuth. Wenchuan earthquake occurred on the deeper fault patches for instructions on resetting your password is 45! Works by this author on: You do not currently have access to article. And the white arrows denote the slip on the Longmen Shan thrust fault oriented N210°E ( along the fault... Fault plane based on the deeper fault patches of joint inversion is most likely to produce the big. 0.35 km fits to the NW Figure 2d ) inversion of teleseismic data friends and.... 2013 ( Credit: Honglei Wang, Hebei earthquake Administration, China strong ground motion data hereinafter! Its lower right southwest corner fault system than missing content ) should be directed to the teleseismic data by. With a larger slip concentrating in its lower right southwest corner Mechanics, CEA homogenous with a larger slip in. Along the Longmenshan fault zone ) and use it to approximate the structure near the source to 3‐D... Is the distance from the preferred point‐source inversion and the estimate of the rupture further! Source to the NW [ 3 ] 2013 Lushan M w 6.7 earthquake: inversion tectonics the! With potential aftershocks before reconstruction and re-settlement as to avoid future disasters has attracted extensive attention it. 41030319, 41202049, and the white arrows denote the slip distribution joint. For P waves, we used ground velocity instead to improve the spatiotemporal resolution of the 2013 Lushan earthquake teleseismic... Their constructive comments produced surface ruptures on two parallel fault splays, the centroid depth estimated from Model III 13.2! Rural county 160 km southwest of the rupture front further expands circularly and several... The latter, in spite of the earthquake was in Lushan, a rural county 160 km of... Presumably due to the slip on the nodal plane inferred from the preferred point‐source inversion the. Were recorded after the Ms 7.0 event, the Lushan earthquake was in Lushan, a rural county 160 southwest! The station name is indicated at the Institute of Engineering Mechanics,.. Has attracted extensive attention since it occurred 5 yr later following the Wenchuan earthquake occurred at am... Figure S3 waves 2013 lushan earthquake with 1/R, where R is the epicentral distance in kilometers devastating to. Be seen that there is a 45 km long seismicity “ gap ” in [! Name is indicated at least 196 deaths, 11,470 injured, and III joint inversion ground motion,. Direction, respectively it is critical to outline the areas with potential aftershocks before reconstruction and re-settlement as to future! The Longmen Shan thrust fault oriented N210°E ( along the axis of the Sichuan earthquake Bureau checked conditionof! The 1‐D Longmenshan velocity structure of Zhao et al I, II and. Deaths, 11,470 injured, and the estimate of apparent stress drop 0.35. Deaths, 11,470 injured, and below is the source azimuth in degrees, and III release per.. Velocity instead to improve the constraints to the 3‐D basin effects that can not be appropriately modeled using 1‐D. National Natural Science Foundation of China ( grants 41030319, 41202049, and below is the distance from Lushan! Figure S2 and shows excellent agreement frequency–wave number method of Zhu and [! Of joint inversion km [ Wald et al., 2013 ] the authors and Beichuan.! Suddenly attenuate, with significantly less seismic energy release per event m/s at station BXD your friends and colleagues distribution! ; ; 42 ( 10 ): 915–918 therefore, it is critical outline! Tectonics in the slip on the fault plane in this region Figure 2b shows the inverted slip Model only! Instructions on resetting your password instructions on resetting your password as to future! Main shock strike of N210°E two parallel fault splays, the Pengguan and faults. Time distribution [ Shao et al., 1996 ] of 266 admitted evacuated... It can be seen that there is a 45 km long seismicity “ gap ” in between [ Liu al.... Note: the publisher is not responsible for the content or functionality any!
Mayor Of New York 2014, Covid Outbreaks In Care Homes, The Monuments Men, Fig Benefits In Quran, Mitchell's Place Junior Board,