Open AccessSlip distribution effect in spatial coulomb stress analysis (Case study: Palu earthquake on September 28, 2018)
Author(s) -
Kevin Hanyu Clinton Wulur,
I Dewa Putu Oka Suardi,
Sesar Prabu Dwi Sriyanto,
Yusuf Hadi Perdana
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/873/1/012033
Subject(s) - aftershock , seismology , asperity (geotechnical engineering) , geology , slip (aerodynamics) , fault plane , coulomb , spatial distribution , fault (geology) , geodesy , physics , geotechnical engineering , nuclear physics , remote sensing , thermodynamics , electron
On September 28, 2018, the Palu-Koro fault released the accumulated stress that caused the earthquake. An earthquake with magnitude 7.5 caused large and massive damage around Palu. There were many aftershocks along the Palu-Koro fault. This research aims to calculate a model of spatial Coulomb stress based on this event to find a correlation between mainshock and the aftershocks. The slip distribution was used as an input of the spatial stress Coulomb modeling to increase the accuracy. We use the Teleseismic Body-Wave Inversion method to calculate slip distribution along the fault plane. As a result, this earthquake was generated by the Palu-Koro fault movement with Mw 7.48, strike 350°, dip angle 67°, and rake -9°. There are three asperity zones along the fault plane located in the north and southern parts of the fault plane. The location of the most energy discharge is in the south asperity zone of the fault plane model with a maximum slip value of 1.65 meters. The spatial Coulomb stress change of this event shows that aftershocks concentration are in areas experiencing increased stress after the earthquake.