Focal mechanism and rupture process of the 2012 M w 7.0 Santa Isabel, Mexico earthquake inverted by teleseismic data

2014 ◽  
Vol 26 (3) ◽  
pp. 384-390 ◽  
Author(s):  
Chengli Liu ◽  
Yong Zheng ◽  
Xiong Xiong
Keyword(s):  
Focal Mechanism ◽  
Rupture Process ◽  
Teleseismic Data ◽  
Mexico Earthquake

scholarly journals Kinematic rupture process of the 2014 ChileMw8.1 earthquake constrained by strong-motion, GPS static offsets and teleseismic data

2015 ◽  
Vol 202 (2) ◽  
pp. 1137-1145 ◽  
Author(s):  
Chengli Liu ◽  
Yong Zheng ◽  
Rongjiang Wang ◽  
Xiong Xiong
Keyword(s):  
Strong Motion ◽  
Rupture Process ◽  
Teleseismic Data

Rupture process of the 2015 Pishan earthquake from joint inversion of InSAR, teleseismic data and GPS

2018 ◽  
Vol 61 (10) ◽  
pp. 1467-1481 ◽  
Author(s):  
Xun Wang ◽  
Weimin Wang ◽  
Junmeng Zhao ◽  
Zhenxing Yao
Keyword(s):  
Joint Inversion ◽  
Rupture Process ◽  
Teleseismic Data

Mechanism of the main shock and the aftershock study of the Tabas-e-Golshan (Iran) earthquake of September 16, 1978: A preliminary report

1979 ◽  
Vol 69 (6) ◽  
pp. 1851-1859
Author(s):  
M. Berberian ◽  
I. Asudeh ◽  
R. G. Bilham ◽  
C. H. Scholz ◽  
C. Soufleris
Keyword(s):  
Focal Mechanism ◽  
Preliminary Report ◽  
Main Shock ◽  
Rupture Process ◽  
Rupture Zone ◽  
Local Network ◽  
Depth Range ◽  
Aftershock Activity ◽  
Surface Ruptures

abstract Aftershocks of the Tabas-e-Golshan earthquake (Ms = 7.7) of September 16, 1978 were recorded with a local network of portable seismometers. The main shock produced a discontinuous series of surface ruptures extending 85 km NNW and dipping ENE beneath the Shotori Range. The largest aftershocks located thus far are not concentrated in the hypocentral region of the main shock nor near the ends of the rupture zone but appear to be concentrated down-dip from gaps in the surface ruptures. This suggests that these features may extend to depth and act as barrier zones in the rupture process. The 65 km long zone of aftershock activity dips 40°ENE from the surface break, which agrees with the focal mechanism for the main shock in indicating thrusting on a NNW-striking, ENE-dipping fault. The aftershocks range in depth from 2 to 24 km with greatest concentration in the depth range 5 to 10 km.

Source Characteristics of the 2020 Mw 7.4 Oaxaca, Mexico, Earthquake Estimated from GPS, InSAR, and Teleseismic Waveforms

2021 ◽  
Author(s):  
Yangmao Wen ◽  
Zhuohui Xiao ◽  
Ping He ◽  
Jianfei Zang ◽  
Yang Liu ◽  
...  
Keyword(s):  
Near Field ◽  
Rupture Process ◽  
High Rate ◽  
Coseismic Deformation ◽  
Interferometric Synthetic Aperture Radar ◽  
Key Factors ◽  
Factors Affecting ◽  
Initial Rupture ◽  
Mexico Earthquake ◽  
Nonlinear Joint

Abstract On 23 June 2020, an Mw 7.4 earthquake struck offshore Oaxaca, Mexico, providing a unique opportunity to understand the seismogenic tectonics of the Mexican subduction zone. In this study, near-field coseismic deformation caused by the event was retrieved from Global Positioning System (GPS) observations and Interferometric Synthetic Aperture Radar (InSAR) measurements. Given static geodetic measurements, high-rate GPS waveforms, and teleseismic waveforms, the fault geometry and rupture process for the 2020 Oaxaca earthquake were robustly determined by nonlinear joint inversions. The main slip was located at a depth of 20–30 km with a peak slip of 3.4 m near the epicenter. The total released moment was 1.70×1020  N·m, corresponding to Mw 7.4. The whole rupture process lasted 14 s, with the dominant rupture slip occurring 5–8 s after initial rupture. The mainshock rupture mostly occurred along the fault strike, covering a size of ∼55  km(along strike)×∼35  km(along dip) and totally overlapping with the 1965 Mw 7.5 rupture zone. We speculate that this 2020 earthquake is a repeat event following that in 1965. Fluid percolation under the slab may be one of the key factors affecting the seismogenic depth in the Oaxaca region.

Further studies on the focal mechanism and source rupture process of the 2012 Haida Gwaii, Canada, 7.8 moment magnitude earthquake

2016 ◽  
Vol 53 (2) ◽  
pp. 129-139
Author(s):  
Dariush Motazedian ◽  
Yong Zhang ◽  
Shutian Ma ◽  
Yun-tai Chen
Keyword(s):  
Focal Mechanism ◽  
Fault Plane ◽  
Leading Edge ◽  
Rupture Process ◽  
Moment Magnitude ◽  
Haida Gwaii ◽  
Source Rupture Process ◽  
Sea Floor ◽  
Stress Drops ◽  
Total Seismic Moment

The 28 October 2012 Haida Gwaii, British Columbia, Canada, earthquake with a moment magnitude (MW) of 7.8 occurred along an east-dipping poorly known thrust fault beneath the Queen Charlotte Terrace. It was the largest thrust event ever recorded in this dominated by strike-slip motion region. We studied the focal mechanism and the source rupture process for the event. The retrieved geometric parameters of the fault plane were a strike of 329°, dip of 24°, and slip of 114°. The isotropic moment was negative, and its value was about one-fifth of the total seismic moment released. The earthquake ruptured an area of about 160 km × 60 km, and major slip occurred in an area of about 100 km × 60 km. The maximum slip was about 5.8 m. The slip distribution on the fault plane was highly heterogeneous, with four slip patches. The main slip lay on a large zone above the hypocentre to the sea floor. The maximum and average stress drops calculated using the Brune model were 16.5 and 4.6 MPa, respectively. The major rupture occurred about 10 s after the rupture initiation, and lasted about 25 s. During a subducting earthquake, the leading edge of the overriding plate is assumed to spring seaward and upward, while the landward portion is assumed to extend and drop down, and the generated rapid motions set off a tsunami. The falling-down process seems to be consistent with a negative isotropic moment.

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