Dynamic Rupture Simulation of the 2008 Mw 7.9 Wenchuan Earthquake with Heterogeneous Initial Stress

2012 ◽  
Vol 102 (4) ◽  
pp. 1892-1898 ◽  
Author(s):  
Y.-Y. Wen ◽  
D. D. Oglesby ◽  
B. Duan ◽  
K.-F. Ma
Keyword(s):  
Wenchuan Earthquake ◽  
Initial Stress ◽  
Dynamic Rupture ◽  
Dynamic Rupture Simulation

scholarly journals Dynamic rupture simulation of 2018, Hokkaido Eastern Iburi earthquake: role of non-planar geometry

2020 ◽  
Vol 72 (1) ◽  
Author(s):  
Tatsuya Hisakawa ◽  
Ryosuke Ando ◽  
Tomoko Elizabeth Yano ◽  
Makoto Matsubara
Keyword(s):  
Planar Geometry ◽  
Dynamic Rupture ◽  
Dynamic Rupture Simulation

Dynamic Rupture Scenarios of Large Earthquakes on the Rodgers Creek-Hayward-Calaveras-Northern Calaveras Fault System, California

2021 ◽  
Author(s):  
Ruth Harris ◽  
Michael Barall ◽  
David Ponce ◽  
Diane Moore ◽  
Russell Graymer ◽  
...  
Keyword(s):  
Initial Stress ◽  
Active Faults ◽  
Large Earthquake ◽  
Stress Conditions ◽  
Rock Properties ◽  
Fault System ◽  
Fault Geometry ◽  
Dynamic Rupture ◽  
Field Samples ◽  
Large Earthquakes

<p>The Rodgers Creek-Hayward-Calaveras-Northern Calaveras fault system in California dominates the hazard posed by active faults in the San Francisco Bay Area. Given that this fault system runs through a densely populated area, a large earthquake in this region is likely to affect millions of people. This study produced scenarios of large earthquakes in this fault system, using spontaneous (dynamic) rupture simulations. These types of physics-based computational simulations require information about the 3D fault geometry, physical rock properties, fault friction, and initial stress conditions. In terms of fault geometry, the well-connected multi-fault system includes the Hayward fault, at its southern end the Central and Northern Calaveras faults, and at its northern end the Rodgers Creek fault. Geodetic investigations of the fault system’s slip-rate pattern provide images of where the fault surfaces at depth are creeping or locked interseismically, and this helped us choose appropriate initial stress conditions for our simulations. A 3D geologic model of the fault system provides the 3D rock units and fault structure at depth, while field samples from rocks collected at Earth’s surface provide frictional parameters. We used this suite of information to investigate the behavior of large earthquake ruptures nucleating at various positions along this partially creeping fault system. We found that large earthquakes starting on the Hayward fault or on the Rodgers Creek fault may be slowed, stopped, or unaffected in their progress, depending on how much energy is released by the creeping regions of the Hayward and Central Calaveras faults during the time between large earthquakes. Large earthquakes starting on either the Hayward fault or the Rodgers Creek faults will likely not rupture the Northern Calaveras fault, and large earthquakes starting on either the Northern Calaveras fault or the Central Calaveras fault will likely remain confined to those fault segments.</p>

Rupture Propagation along Stepovers of Strike-Slip Faults: Effects of Initial Stress and Fault Geometry

2020 ◽  
Vol 110 (3) ◽  
pp. 1011-1024 ◽  
Author(s):  
Hui Wang ◽  
Mian Liu ◽  
Benchun Duan ◽  
Jianling Cao
Keyword(s):  
Steady State ◽  
Initial Stress ◽  
Strike Slip ◽  
Frictional Property ◽  
Rupture Propagation ◽  
Fault Geometry ◽  
Dynamic Rupture ◽  
Initial Stress Field ◽  
State Stress

ABSTRACT Large earthquakes on strike-slip faults often rupture multiple fault segments by jumping over stepovers. Previous studies, based on field observations or numerical modeling with a homogeneous initial stress field, have suggested that stepovers more than ∼5  km wide would stop the propagation of rupture, but many exceptions have been observed in recent years. Here, we integrate a dynamic rupture model with a long-term fault stress model to explore the effects of background stress perturbation on rupture propagation across stepovers along strike-slip faults. Our long-term fault models simulate steady-state stress perturbation around stepovers. Considering such stress perturbation in dynamic rupture models leads to prediction of larger distance a dynamic rupture can jump over stepovers: over 15 km for a releasing stepover or 7 km for a restraining stepover, comparing with the 5 km limit in models with the same fault geometry and frictional property but assuming a homogeneous initial stress. The effect of steady-state stress perturbations is stronger in an overlapping stepover than in an underlapping stepover. The maximum jumping distance can reach 20 km in an overlapping releasing stepover with low-static frictional coefficients. These results are useful for estimating the maximum length of potential fault ruptures and assessing seismic hazard.

On the Free‐Surface Problem in Dynamic‐Rupture Simulation of a Nonplanar Fault

2016 ◽  
Vol 106 (3) ◽  
pp. 1162-1175 ◽  
Author(s):  
Zhenguo Zhang ◽  
Hanqing Huang ◽  
Wei Zhang ◽  
Xiaofei Chen
Keyword(s):  
Free Surface ◽  
Dynamic Rupture ◽  
Dynamic Rupture Simulation
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