Study on rupture zone of the M=8.1 Kunlun Mountain earthquake using fault-zone trapped waves

2005 ◽  
Vol 18 (1) ◽  
pp. 43-52 ◽  
Author(s):  
Song-lin Li ◽  
Xian-kang Zhang ◽  
Ji-chang Fan
Keyword(s):  
Fault Zone ◽  
Rupture Zone ◽  
Trapped Waves ◽  
Kunlun Mountain

Rupture Branching Structure of the 2014 Mw 6.0 South Napa, California, Earthquake Inferred from Explosion‐Generated Fault‐Zone Trapped Waves

2019 ◽  
Vol 109 (5) ◽  
pp. 1907-1921
Author(s):  
Yong‐Gang Li ◽  
Rufus D. Catchings ◽  
Mark R. Goldman
Keyword(s):  
Fault Zone ◽  
Rupture Zone ◽  
Seismic Velocities ◽  
Trapped Waves ◽  
Low Velocity ◽  
Surface Rupture ◽  
Multiple Fault ◽  
S Waves ◽  
Surface Rupture Zone ◽  
Surface Ruptures

Abstract We present evidence for multiple fault branches of the West Napa fault zone (WNFZ) based on fault‐zone trapped waves (FZTWs) generated by two explosions that were detonated within the main surface rupture zone produced by the 24 August 2014 Mw 6.0 South Napa earthquake. The FZTWs were recorded by a 15‐kilometer‐long dense (100 m spacing) linear seismic array consisting of 155 4.5‐hertz three‐component seismometers that were deployed across the surface ruptures and adjacent faults in Napa Valley in the summer of 2016. The two explosions were located ∼3.5  km north and ∼5  km south of the 2016 recording array. Prominent FZTWs, with large amplitudes and long wavetrains following the P and S waves, are observed on the seismograms. We analyzed FZTW waveforms in both time and frequency domains to characterize the branching structure of subsurface rupture zones along the WNFZ. The 2014 surface rupture zone was ∼12  km in length along the main trace of the WNFZ, which appears to form an ∼400–600‐meter‐wide low‐velocity waveguide to depths in excess of 5–7 km. Seismic velocities within the main rupture are reduced by 40%–50% relative to the surrounding‐rock velocities. Within 1.5 km of the main trace of the WNFZ, there are at least two subordinate fault traces that formed 3‐ to 6‐kilometer‐long surface breaks during the 2014 mainshock. Our modeling suggests that these subordinate fault traces are also low‐velocity waveguides that connect with the main rupture at depths of ∼2–3  km, forming a flower structure. FZTWs were also recorded at seismic stations across the Carneros fault (CF), which is ∼1  km west of the WNFZ; this suggests that the CF connects with the WNFZ at shallow depths, even though the CF did not experience surface rupture during the 2014 Mw 6.0 mainshock. 3D finite‐difference simulations of recorded FZTWs imply a branching structure along multiple fault strands associated with the WNFZ.

Low-velocity damaged structure of the San Andreas Fault at Parkfield from fault zone trapped waves

2004 ◽  
Vol 31 (12) ◽  
pp. n/a-n/a ◽  
Author(s):  
Yong-Gang Li ◽  
John E. Vidale ◽  
Elizabeth S. Cochran
Keyword(s):  
Fault Zone ◽  
San Andreas Fault ◽  
Trapped Waves ◽  
Low Velocity ◽  
San Andreas

scholarly journals A delineation of the Nojima fault ruptured in theM7.2 Kobe, Japan, earthquake of 1995 using fault zone trapped waves

1998 ◽  
Vol 103 (B4) ◽  
pp. 7247-7263 ◽  
Author(s):  
Yong-Gang Li ◽  
Keiiti Aki ◽  
John E. Vidale ◽  
Mark G. Alvarez
Keyword(s):  
Fault Zone ◽  
Trapped Waves ◽  
Nojima Fault

scholarly journals Fault zone trapped waves at Longmenshan fault belt

2013 ◽  
Vol 4 (3) ◽  
pp. 48-52
Author(s):  
Sun Yi ◽  
Lai Xiaoling
Keyword(s):  
Fault Zone ◽  
Trapped Waves ◽  
Longmenshan Fault ◽  
Fault Belt

scholarly journals Fault-zone trapped waves at Muyu in Wenchuan earthquake region

2011 ◽  
Vol 2 (2) ◽  
pp. 66-70 ◽  
Author(s):  
Lai Xiaoling ◽  
Sun Yi
Keyword(s):  
Wenchuan Earthquake ◽  
Fault Zone ◽  
Trapped Waves

scholarly journals An algorithm for automated identification of fault zone trapped waves

2015 ◽  
Vol 202 (2) ◽  
pp. 933-942 ◽  
Author(s):  
Z.E. Ross ◽  
Y. Ben-Zion
Keyword(s):  
Fault Zone ◽  
Automated Identification ◽  
Trapped Waves
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