Spontaneous dynamic rupture modeling of 2017 M 5.4 Pohang, South Korea, earthquake, using the slip-weakening friction law

2020 ◽  
Author(s):  
Seok Goo Song ◽  
Chang Soo Cho ◽  
Geoffrey Ely
Keyword(s):  
Stress Drop ◽  
High Performance ◽  
Slip Model ◽  
Dynamic Rupture ◽  
Coseismic Slip ◽  
Southeastern Part ◽  
Friction Law ◽  
Initial Nucleation ◽  
Dynamic Rupture Model ◽  
Rupture Model

<p>An M 5.4 earthquake occurred in the southeastern part of the Korean Peninsula in 2017. It is an oblique thrust event that occurred at a relatively shallow depth (~ 5 km) although it did not create coseismic surface rupture. A coseismic slip model was successfully obtained by inverting the ground displacement field extracted by the InSAR data (Song and Lee, 2019). In this study, we performed spontaneous dynamic rupture modeling using the slip weakening friction law. The static stress drop distribution obtained by the coseismic slip model was used as an input stress field. We adopted high performance computing (HPC) using the parallelized dynamic rupture modeling code (SORD, Support Operator Rupture Dynamics). Although our target event is moderate-sized one, we can successfully produce a spontaneous dynamic rupture model using a relatively small initial nucleation patch (radius ~ 1 km) with a relatively small slip weakening distance (~ 5 cm). Our preliminary results show that the rupture creates an asperity near the initial nucleation zone with approximately 4 MPa stress drop, then propagates obliquely upward both in the northeast and southwest directions. Although we assumed a single planar fault plane in our current rupture modeling, it seems worthwhile to dynamically model the rupture process, including complex fault geometry in following studies. Dynamic rupture modeling for a natural earthquake provides an opportunity to understand the dynamic rupture characteristics of the earthquake, including both stress drop and fracture energy.</p>

scholarly journals FUNDAMENTAL STUDY ON PULSE-TYPE EARTHQUAKE MOTION NEAR SEISMIC FAULT BASED ON DYNAMIC RUPTURE MODEL

2015 ◽  
Vol 21 (47) ◽  
pp. 83-88
Author(s):  
Masayuki NAGANO ◽  
Ryo UEDA ◽  
Kenichi KATO ◽  
Yasuhiro OTSUKA ◽  
Kazuhito HIKIMA ◽  
...  
Keyword(s):  
Dynamic Rupture ◽  
Fundamental Study ◽  
Seismic Fault ◽  
Earthquake Motion ◽  
Dynamic Rupture Model ◽  
Pulse Type ◽  
Rupture Model

Exploring Physical Links between Fluid Injection and Nearby Earthquakes: The 2012 Mw 4.8 Timpson, Texas, Case Study

2020 ◽  
Vol 110 (5) ◽  
pp. 2350-2365 ◽  
Author(s):  
Dawid Szafranski ◽  
Benchun Duan
Keyword(s):  
Aftershock Sequence ◽  
Fluid Injection ◽  
Dynamic Rupture ◽  
Predictive Tool ◽  
Dynamic Friction Coefficient ◽  
Effective Normal Stress ◽  
A Value ◽  
Dynamic Rupture Model ◽  
Rupture Model

ABSTRACT In this work, we integrate a fluid-flow model of 3D deformable porous media with a dynamic rupture model of earthquakes in 3D heterogeneous geologic medium. The method allows us to go beyond fault failure potential analyses and to examine how big an earthquake can be if part of a fault reaches failure due to fluid injection. We apply the method to the 17 May 2012 Mw 4.8 Timpson, Texas, earthquake as a case study. The simulated perturbations of pore pressure and stress from wastewater injection at the time of the mainshock are high enough (several MPa) to trigger an earthquake. Dynamic rupture modeling could reproduce the major observations from the Mw 4.8 event, including its size, focal mechanism, and aftershock sequence, and thus building a more convincing physical link between fluid injection and the Mw 4.8 earthquake. Furthermore, parameter space studies of dynamic rupture modeling allow us to place some constraints on fault frictional properties and background stresses. For the Timpson case, we find that a dynamic friction coefficient of ∼0.3, a value of ∼0.1  m for the critical slip distance in the slip-weakening friction law, and uniform effective normal stress are associated with the Timpson earthquake fault. By reproducing main features of the aftershock sequence of the mainshock, we also demonstrate that the method has potential to become a predictive tool for fluid injection design in the future.

scholarly journals Simulation of Strong Ground Motions of the 2016 Tottori-Chubu Earthquake based on Dynamic Rupture Model

2019 ◽  
Vol 19 (5) ◽  
pp. 5_125-5_135
Author(s):  
Tetsushi WATANABE ◽  
Kenichi KATO ◽  
Yasuhiro OHTSUKA ◽  
Kazuhito HIKIMA ◽  
Tomiichi UETAKE ◽  
...  
Keyword(s):  
Ground Motions ◽  
Dynamic Rupture ◽  
Strong Ground Motions ◽  
Dynamic Rupture Model ◽  
Rupture Model ◽  
Strong Ground

scholarly journals The Mw 7.3 Papanoa, Mexico earthquake of April 18, 2014: Implications for recurrent M > 7 thrust earthquakes in western Guerrero

2017 ◽  
Vol 56 (1) ◽  
Author(s):  
Carlos Mendoza ◽  
María del Rosario Martínez López
Keyword(s):  
Waveform Inversion ◽  
Plate Boundary ◽  
Single Step ◽  
Body Waves ◽  
Slip Model ◽  
Coseismic Slip ◽  
Finite Fault ◽  
Rupture Model ◽  
Inversion Procedure ◽  
Mexico Earthquake

We apply a single-step, finite-fault waveform inversion procedure to derive a coseismic slip model for the large MW 7.3 Papanoa, Mexico earthquake of 18 April 2014 using broadband teleseismic body waves. Inversion of the P and SH ground-displacement waveforms yields a rupture model characterized by two principal sources of slip in the northwest portion of the Guerrero coast. The region is also the site of several M > 7 earthquakes in 1943, 1979 and 1985. A comparison of the 2014 slip model with ruptures observed for the 1979 and 1985 earthquakes suggests that the zones of high slip do not spatially coincide, despite similarities in the size and location of their aftershock areas. The zones of high coseismic slip are interpreted to represent asperity areas along the Cocos- North America plate boundary, and their limited spatial overlap from one event to another indicates that the rupture characteristics of recurring M > 7 thrust earthquakes in this portion of western Guerrero have not repeated in the last 70 years. The abutting nature of the asperities suggests that future large M > 7 earthquakes are likely to involve interplate patches between areas where large coseismic failure has been recently observed. Also, the observed asperities and their intervening regions may define locations where seismic failure may occur in future megathrust events. The results have important implications for the potential and recurrence of large M > 7 subduction earthquakes and the estimation of the strong ground motions expected from these events.

A Dynamic-Rupture Model of the 2019 Mw 7.1 Ridgecrest Earthquake Being Compatible with the Observations

2020 ◽  
Author(s):  
Zhenguo Zhang ◽  
Wenqiang Zhang ◽  
Danhua Xin ◽  
Kejie Chen ◽  
Xiaofei Chen
Keyword(s):  
Global Positioning System ◽  
Strong Ground Motion ◽  
Fault Plane ◽  
Positioning System ◽  
Dynamic Rupture ◽  
Global Positioning ◽  
Dynamic Rupture Model ◽  
Rupture Model ◽  
Strong Ground ◽  
Good Agreement

Abstract We explore the 2019 Mw 7.1 Ridgecrest earthquake dynamic rupture on the nonplanar fault with homogeneous dynamic parameters using a layered media model. Our model shows that this event produced an average of 1.9 m of right-lateral slip with a maximum slip of ∼4.2  m at the place near the epicenter, and the variation of fault-plane strike angles from the middle to the southeastern segment appears to have behaved as a “stress barrier,” which postponed the rupture. We also compare the synthetics based on our dynamic rupture with the field records and find good agreement with the static Global Positioning System (GPS) coseismic offsets and strong ground motion waveforms. Our work provides a dynamic-rupture interpretation of the Mw 7.1 Ridgecrest earthquake.

scholarly journals A comparison between Dc′-values obtained from a dynamic rupture model and waveform inversion

2005 ◽  
Vol 32 (14) ◽  
pp. n/a-n/a ◽  
Author(s):  
Takumi Yasuda ◽  
Yuji Yagi ◽  
Takeshi Mikumo ◽  
Takashi Miyatake
Keyword(s):  
Waveform Inversion ◽  
Dynamic Rupture ◽  
Dynamic Rupture Model ◽  
Rupture Model

scholarly journals Effective friction law for small-scale fault heterogeneity in 3D dynamic rupture

2011 ◽  
Vol 116 (B10) ◽  
Author(s):  
S. Latour ◽  
M. Campillo ◽  
C. Voisin ◽  
I. R. Ionescu ◽  
J. Schmedes ◽  
...  
Keyword(s):  
Small Scale ◽  
Dynamic Rupture ◽  
Friction Law ◽  
Fault Heterogeneity ◽  
Effective Friction

The relations between the corner frequency, seismic moment and source dynamic parameters derived from the spontaneous rupture of a circular fault

2021 ◽  
Vol 228 (1) ◽  
pp. 134-146
Author(s):  
Jian Wen ◽  
Jiankuan Xu ◽  
Xiaofei Chen
Keyword(s):  
Stress Drop ◽  
Seismic Moment ◽  
Dynamic Models ◽  
Scaling Law ◽  
Boundary Integral ◽  
Corner Frequency ◽  
Dynamic Parameters ◽  
Zone Size ◽  
Dynamic Rupture ◽  
Scaling Relationships

SUMMARY The stress drop is an important dynamic source parameter for understanding the physics of source processes. The estimation of stress drops for moderate and small earthquakes is based on measurements of the corner frequency ${f_c}$, the seismic moment ${M_0}$ and a specific theoretical model of rupture behaviour. To date, several theoretical rupture models have been used. However, different models cause considerable differences in the estimated stress drop, even in an idealized scenario of circular earthquake rupture. Moreover, most of these models are either kinematic or quasi-dynamic models. Compared with previous models, we use the boundary integral equation method to simulate spontaneous dynamic rupture in a homogeneous elastic full space and then investigate the relations between the corner frequency, seismic moment and source dynamic parameters. Spontaneous ruptures include two states: runaway ruptures, in which the rupture does not stop without a barrier, and self-arresting ruptures, in which the rupture can stop itself after nucleation. The scaling relationships between ${f_c}$, ${M_0}$ and the dynamic parameters for runaway ruptures are different from those for self-arresting ruptures. There are obvious boundaries in those scaling relations that distinguish runaway ruptures from self-arresting ruptures. Because the stress drop varies during the rupture and the rupture shape is not circular, Eshelby's analytical solution may be inaccurate for spontaneous dynamic ruptures. For runaway ruptures, the relations between the corner frequency and dynamic parameters coincide with those in the previous kinematic or quasi-dynamic models. For self-arresting ruptures, the scaling relationships are opposite to those for runaway ruptures. Moreover, the relation between ${f_c}$ and ${M_0}$ for a spontaneous dynamic rupture depends on three factors: the dynamic rupture state, the background stress and the nucleation zone size. The scaling between ${f_c}$ and ${M_0}$ is ${f_c} \propto {M_0^{ - n}}$, where n is larger than 0. Earthquakes with the same dimensionless dynamic parameters but different nucleation zone sizes are self-similar and follow a ${f_c} \propto {M_0^{ - 1/3}}$ scaling law. However, if the nucleation zone size does not change, the relation between ${f_c}$ and ${M_0}$ shows a clear departure from self-similarity due to the rupture state or background stress.

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