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

• DOI: 10.5194/egusphere-egu2020-12490
• Publication Date: 2020-03-09T23:44:00Z
• Authors: Seok Goo Song; Chang Soo Cho; Geoffrey Ely
• Keywords: Earthquake rupture; Stress field; Thrust fault

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