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Title: Spatial and Temporal Variations in the Moment Tensor Solutions of the 2008 Wenchuan Earthquake Aftershocks and Their Tectonic Implications

Journal Article · · Tectonics
DOI:https://doi.org/10.1002/2017TC004764· OSTI ID:1513154
ORCiD logo [1];  [2];  [3];  [1];  [1]; ORCiD logo [4];  [1]; ORCiD logo [5]
  1. Beijing Earthquake Agency (China)
  2. Univ. of California, Berkeley, CA (United States). Berkeley Seismological Lab.
  3. China Univ. of Petroleum, Beijing (China). Unconventional Natural Gas Inst.
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  5. Macquarie Univ., North Ryde, NSW (Australia). ARC Centre of Excellence from Core to Crust Fluid Systems; Univ. of Western Australia, Perth, WA (Australia). Centre for Exploration Targeting; Geological Survey of Western Australia, East Perth, WA (Australia)
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Following the mainshock of the 2008 M8 Wenchuan Earthquake, there were more than 300 ML ≥ 4.0 aftershocks that occurred between 12 May 2008 and 8 September 2010. We analyzed here the broadband waveforms for these events and found 160 events with sufficient signal-to-noise levels to invert for seismic moment tensors. Considering the length of the activated fault and the distances to the recording stations, four velocity models were employed to account for variability in crustal structure. The moment tensor solutions show considerable variations with a mixture of mainly reverse and strike-slip mechanisms and a small number of normal events and ambiguous events. We analyzed the spatial and temporal distribution of the aftershocks and their mechanism types to characterize the structure and the deformation occurring in the Longmen Shan fold and thrust belt. Our results suggest that the stress is very complex at the Longmen Shan fault zone. The moment tensors have both a spatial segmentation with two major categories of the moment tensor of thrust and strike slip; and a temporal pattern that the majority of the aftershocks gradually migrated to thrust-type events. The variability of aftershock mechanisms is a strong indication of significant tectonic release and stress reorganization that activated numerous small faults in the system.

Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Beijing Earthquake Agency (China); China Univ. of Petroleum, Beijing (China)
Sponsoring Organization:
USDOE; National Natural Science Foundation of China (NSFC); China Earthquake Administration (CEA); China Scholarship Council
Grant/Contract Number:
AC52-07NA27344; 41604045; 41474087; XH16004Y
OSTI ID:
1513154
Report Number(s):
LLNL-JRNL-771048; 960868
Journal Information:
Tectonics, Vol. 37, Issue 3; ISSN 0278-7407
Publisher:
Wiley/American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 13 works
Citation information provided by
Web of Science

References (47)

Kinematic fault slip evolution source models of the 2008 M7.9 Wenchuan earthquake in China from SAR interferometry, GPS and teleseismic analysis and implications for Longmen Shan tectonics journal May 2013
Regional stresses inferred from coseismic slip models of the 2008 Mw 7.9 Wenchuan, China, earthquake journal January 2013
Surface wave array tomography in SE Tibet from ambient seismic noise and two-station analysis - II. Crustal and upper-mantle structure journal April 2008
Source Parameters of the 2014 M s  6.5 Ludian Earthquake Sequence and Their Implications on the Seismogenic Structure journal September 2015
The role of crustal strength variations in shaping orogenic plateaus, with application to Tibet: CRUSTAL STRENGTH AND PLATEAU DEFORMATION journal August 2008
Non-double-couple earthquakes 1. Theory journal November 1998
Lithospheric structure of the Arabian Shield and Platform from complete regional waveform modelling and surface wave group velocities journal September 1999
Parametrization of general seismic potency and moment tensors for source inversion of seismic waveform data journal April 2013
Slip maxima at fault junctions and rupturing of barriers during the 2008 Wenchuan earthquake journal September 2009
Crustal structure beneath the eastern margin of the Tibetan Plateau and its tectonic implications journal January 2007
Continuous Permeability Measurements Record Healing Inside the Wenchuan Earthquake Fault Zone journal June 2013
Source parameters of the Sierra Madre Earthquake from regional and local body waves journal November 1991
The Role Played and Opportunities Provided by IGP DMC of China National Seismic Network in Wenchuan Earthquake Disaster Relief and Researches journal October 2010
Two-phase growth of high topography in eastern Tibet during the Cenozoic journal August 2012
Spatial distribution and focal mechanism solutions of the Wenchuan earthquake series: Results and implications journal February 2011
Seismic signature of the collision between the east Tibetan escape flow and the Sichuan Basin journal April 2010
12 May 2008 M = 7.9 Wenchuan, China, earthquake calculated to increase failure stress and seismicity rate on three major fault systems journal January 2008
Dilational Processes Accompanying Earthquakes in the Long Valley Caldera journal April 2000
Stress changes from the 2008 Wenchuan earthquake and increased hazard in the Sichuan basin journal July 2008
Surface Deformation and Lower Crustal Flow in Eastern Tibet journal May 1997
Coseismic slip model of the 2008 Wenchuan earthquake derived from joint inversion of interferometric synthetic aperture radar, GPS, and field data journal January 2010
Rupture of deep faults in the 2008 Wenchuan earthquake and uplift of the Longmen Shan journal July 2011
Oblique, High-Angle, Listric-Reverse Faulting and Associated Development of Strain: The Wenchuan Earthquake of May 12, 2008, Sichuan, China journal April 2010
Spatial segmentation characteristic of focal mechanism of aftershock sequence of Wenchuan Earthquake journal June 2009
Co-seismic thrusting rupture and slip distribution produced by the 2008 Mw 7.9 Wenchuan earthquake, China journal June 2009
First- and second-order patterns of stress in the lithosphere: The World Stress Map Project journal January 1992
A Preliminary Study on Crustal Velocity Structures of Maqin-Lanzhou-Jingbian Deep Seismic Sounding Profile journal March 2002
Stable inversions for complete moment tensors journal August 2008
Rupture process of the 2008 Wenchuan, China earthquake inferred from teleseismic waveform inversion and forward modeling of broadband seismic waves journal August 2010
A geological and geophysical context for the Wenchuan earthquake of 12 May 2008, Sichuan, People's Republic of China journal January 2008
Slip distribution of the 2008 Wenchuan Ms 7.9 earthquake by joint inversion from GPS and InSAR measurements: a resolution test study: Slip distribution of 2008 Wenchuan earthquake journal May 2011
Rupture process of the Wenchuan M8.0 earthquake of Sichuan China: the segmentation feature journal August 2009
Coseismic fault slip of the 2008 M w 7.9 Wenchuan earthquake estimated from InSAR and GPS measurements : WENCHUAN COSEISMIC FAULT SLIP journal January 2010
Component azimuths of the CEArray stations estimated from P-wave particle motion journal February 2011
Failure patterns caused by localized rise in pore-fluid overpressure and effective strength of rocks journal January 2007
Strong Ground-Motion Simulation of the 12 May 2008 Mw 7.9 Wenchuan Earthquake, Using Various Slip Models journal October 2010
Source process of the 12 May 2008 Wenchuan, China, earthquake determined by waveform inversion of teleseismic body waves with a data covariance matrix journal July 2012
Study on the Effect of Source-Contacting Gas Accumulations upon Abnormal Pressures in Western Sichuan Depression journal March 2008
The 1994 Northridge earthquake sequence in California: Seismological and tectonic aspects journal July 1995
Crustal Structures beneath West Qinling-East Kunlun Orogen and its Adjacent Area -Result of Wide-Angle Seismic Reflection and Refraction Experiment journal March 2008
Crustal thicknesses and Poisson's ratios in the eastern Tibetan Plateau and their tectonic implications journal January 2010
Structure of the crust beneath the southeastern Tibetan Plateau from teleseismic receiver functions journal December 2007
Strong aftershocks in the northern segment of the Wenchuan earthquake rupture zone and their seismotectonic implications journal November 2010
Determination of source parameters at regional distances with three-component sparse network data journal May 1993
Reanimating eastern Tibet journal August 2012
Isotropic source terms of San Jacinto fault zone earthquakes based on waveform inversions with a generalized CAP method journal January 2015
Surface wave array tomography in SE Tibet from ambient seismic noise and two-station analysis - II. Crustal and upper-mantle structure text January 2017

Cited By (1)

A Gravity Study of the Longmenshan Fault Zone: New Insights Into the Nature and Evolution of the Fault Zone and Extrusion-Style Growth of the Tibetan Plateau Since 40 Ma journal January 2019

Figures / Tables (3)

Table 1(p. 29)table Table 1
Table 2(p. 29)table Table 2
Table 3(p. 30)table Table 3

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Related Subjects

58 GEOSCIENCES
aftershock sequence
moment tensor solution
broadband waveforms
Wenchuan earthquake