Precise Hypocenter Determination around Palu Koro Fault: a Preliminary Results

Southeast Asian Conference on Geophysics

Muhammad Fawzy Ismullah, M.^1 ; Dian Nugraha, Andri^2 ; Ramdhan, Mohamad^3,4 ; Wandono^4

Master Program of Geophysical Engineering, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Ganesha 10, Bandung

40132, Indonesia^1

Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Ganesha 10, Bandung

40132, Indonesia^2

Doctorate Program of Earth Science, Faculty of Earth Sciences and Technology, Institut Teknologi Bandung, Ganesha 10, Bandung

40132, Indonesia^3

Agency for Meteorology, Climatology and Geophysics (BMKG), Jakarta, Indonesia^4

关键词: Double differences;    Earthquake events;    Hypocenter location;    P- and S-waves;    Residual time;    Seismic velocities;    Tectonic patterns;    Waveform cross correlation;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/62/1/012056/pdf
DOI  :  10.1088/1755-1315/62/1/012056

来源: IOP

【 摘 要 】

Sulawesi area is located in complex tectonic pattern. High seismicity activity in the middle of Sulawesi is related to Palu Koro fault (PKF). In this study, we determined precise hypocenter around PKF by applying double-difference method. We attempt to investigate of the seismicity rate, geometry of the fault and distribution of focus depth around PKF. We first re-pick P-and S-wave arrival time of the PKF events to determine the initial hypocenter location using Hypoellipse method through updated 1-D seismic velocity. Later on, we relocated the earthquake event using double-difference method. Our preliminary results show the distribution of relocated events are located around PKF and have smaller residual time than the initial location. We will enhance the hypocenter location through updating of arrival time by applying waveform cross correlation method as input for double-difference relocation.