scholarly journals Strong Aftershock Study Based on Coulomb Stress Triggering—A Case Study on the 2016 Ecuador Mw 7.8 Earthquake

2017 ◽  
Vol 7 (1) ◽  
pp. 88 ◽  
Author(s):  
Jianchao Wu ◽  
Yongjian Cai ◽  
Weijie Li ◽  
Qian Feng
Keyword(s):  
Coulomb Stress ◽  
Strong Aftershock ◽  
Stress Triggering

The Stress Triggering of Aftershocks by Badong M5.1 Mainshock from Coulomb Stress Changes

2014 ◽  
Vol 971-973 ◽  
pp. 2172-2175
Author(s):  
Dong Ning Lei ◽  
Jian Chao Wu ◽  
Yong Jian Cai
Keyword(s):  
Stress Change ◽  
Coulomb Stress ◽  
Coulomb Stress Change ◽  
Coulomb Stress Changes ◽  
Stress Changes ◽  
Stress Triggering

TheCoulomb stress changes are usually adopted to make analysis on faultinteractions and stress triggering. This paper mainly deals with Coulomb stresschange of mainshock and affect on aftershocks. We preliminarily conclude thatthe mainshock produce Coulomb stress change on aftershocks most behavingpositive and triggered them. By calculating it is obvious that more aftershocksfell into stress increasing area and triggering percentage is up to ninety ofmaximum and seventy-one of minimum.

Stress triggering among faults rupturing during one earthquake: a case study of the 2016 Mw7.8 Kaikōura Earthquake, New Zealand

2020 ◽  
Vol 65 (2) ◽  
pp. 89-91
Author(s):  
Bin Shan ◽  
Yashan Feng ◽  
Chengli Liu ◽  
Zujun Xie ◽  
Xiong Xiong
Keyword(s):  
New Zealand ◽  
Stress Triggering ◽  
Kaikoura Earthquake

Static Stress Changes and Triggering Imposed by Wenchuan Earthquake on Lushan M7 Earthquake

2014 ◽  
Vol 597 ◽  
pp. 324-327
Author(s):  
Dong Ning Lei ◽  
Yong Jian Cai ◽  
Heng Li
Keyword(s):  
Wenchuan Earthquake ◽  
Static Stress ◽  
Coulomb Stress ◽  
Stress Increase ◽  
Stress Changes ◽  
Stress Triggering ◽  
Important Field ◽  
Earthquake Event ◽  
Space Stress

Some faults rupture the surface followed by coseismic dislocation, which causes space stress changes and transmits or imposes static stress on or to neighboring faults.The static stress triggering leads to the adjacent fault ruptured in advance, which means a Coulomb stress increase and triggers a new earthquake event. In recent two decades, some studies on stress triggering became important field of seismotectonics. The occurrence of both Wenchuan M8.0 earthquake and Japan M9.0 eathquake have arisen interest of many researchers, and obtained much new result and understanding.

AutoCoulomb: An Automated Configurable Program to Calculate Coulomb Stress Changes on Receiver Faults with Any Orientation and its Application to the 2020 Mw 7.8 Simeonof Island, Alaska, Earthquake

2021 ◽  
Author(s):  
Jianjun Wang ◽  
Caijun Xu ◽  
Jeffrey T. Freymueller ◽  
Yangmao Wen ◽  
Zhuohui Xiao
Keyword(s):  
Batch Process ◽  
Stress Change ◽  
Coulomb Stress ◽  
Slow Slip ◽  
Coulomb Stress Change ◽  
Coulomb Stress Changes ◽  
Stress Changes ◽  
Command Line Tool ◽  
Alaska Earthquake

Abstract Coulomb stress change is the change in resultant force of shear stress and friction imposed on a receiver fault plane. The resulting stress change is often computed using the Coulomb 3.4 and the postseismic Green’s functions and postseismic components (PSGRN-PSCMP) programs. Notwithstanding both preferences, both have incomplete optimally oriented failure planes (OOPs) and are inconvenient to resolve Coulomb stress changes on various fault planes placed in varying depths. Here, we present an alternative program termed AutoCoulomb. It leverages the shell command-line tool to automatically batch-process Coulomb stress changes on all sorts of receiver fault planes. We first validate the program. We then apply it to the 2020 Mw 7.8 Simeonof Island, Alaska, earthquake, as a case study. Our results show that Coulomb stress changes resolved on fixed receiver faults, using the three programs, are in line with each other. So are those resolved on 3D OOPs using the PSGRN–PSCMP and the AutoCoulomb programs. Nevertheless, Coulomb stress changes on 2D OOPs, generated by the AutoCoulomb program, always outweigh those done by the Coulomb 3.4 program, indicating that 2D OOPs constrained by the latter are not the most optimal. Some nonoptimal 2D OOPs result in the reversal of the signs of Coulomb stress changes, posing a risk of misleading stress shadows with negative Coulomb stress changes. For the case study, the 28 July 2020 Mw 6.1 aftershock received a positive coseismic Coulomb stress change of ∼3.5 bars. In contrast, the compounded coseismic Coulomb stress changes at the hypocenters of the 1946 Mw 8.2, the 1948 Mw 7.2, and the 2020 Mw 7.8 earthquakes are within a range from −1.1 to 0.1 bar, suggesting that coseismic Coulomb stress changes promoted by preceding mainshocks alone are not responsible for these mainshocks. Other factors, such as postseismic viscoelastic relaxation, afterslip, and slow slip, may contribute to promoting their occurrence.

scholarly journals Study on Coulomb Stress Triggering of the April 2015 M7.8 Nepal Earthquake Sequence

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Jianchao Wu ◽  
Qing Hu ◽  
Weijie Li ◽  
Dongning Lei
Keyword(s):  
Main Shock ◽  
Earthquake Sequence ◽  
Coulomb Stress ◽  
Coulomb Stress Changes ◽  
Nepal Earthquake ◽  
Rupture Plane ◽  
Stress Changes ◽  
Stress Triggering ◽  
Source Models ◽  
Earthquake Sequences

In April 2015, a M7.8 earthquake occurred less than one month before a M7.3 earthquake near Kodari, Nepal. The Nepal earthquake sequences also include four larger (M > 6) aftershocks. To reveal the interrelation between the main shock and the aftershocks, we check the role of coseismic coulomb stress triggering on aftershocks that follow the M7.8 main shock. Based on the focal mechanisms of the aftershocks and source models of the main shock, the coulomb failure stress changes on both of the focal mechanism nodal planes are calculated. In addition, the coulomb stress changes on the focal sources of each aftershock are also calculated. A large proportion of the M > 6 aftershocks occurred in positive coulomb stress areas triggered by the M7.8 main shock. The secondary triggering effect of the M7.3 aftershock is also found in this paper. More specifically, the M7.3 aftershock promoted failure on the rupture plane of the M6.3 aftershock. Therefore, we may conclude that the majority of larger aftershocks, which accumulated positive coulomb stress changes during the sequence, were promoted or triggered by the main shock failure. It suggests that coulomb stress triggering contributed to the evolution of the Nepal M7.8 earthquake sequence.

scholarly journals Observations of static Coulomb stress triggering of the November 2011 M 5.7 Oklahoma earthquake sequence

2014 ◽  
Vol 119 (3) ◽  
pp. 1904-1923 ◽  
Author(s):  
Danielle F. Sumy ◽  
Elizabeth S. Cochran ◽  
Katie M. Keranen ◽  
Maya Wei ◽  
Geoffrey A. Abers
Keyword(s):  
Earthquake Sequence ◽  
Coulomb Stress ◽  
Stress Triggering
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