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Journal of the Australian Society of Exploration Geophysicists
RESEARCH ARTICLE (Open Access)

Direct simulation Monte Carlo method with a focal mechanism algorithm

Asep Nur Rachman 1 Tae Woong Chung 1 4 Kazuo Yoshimoto 2 Sukyoung Yun 3
+ Author Affiliations
- Author Affiliations

1 Department of Energy and Mineral Resources Engineering, Sejong University, Seoul 143-747, Korea.

2 Graduate School of Nanobioscience, Department of Materials System Science, Yokohama City University, Yokohama 236-0027, Japan.

3 Korea Polar Research Institute, Incheon 406-840, Korea.

4 Corresponding author. Email: chungtw@sejong.ac.kr

Exploration Geophysics 46(4) 371-380 https://doi.org/10.1071/EG14116
Submitted: 18 November 2014  Accepted: 19 November 2014   Published: 15 January 2015
Originally submitted to KSEG 30 September 2014, accepted 15 November 2014  

Journal Compilation © ASEG 2015

Abstract

To simulate the observation of the radiation pattern of an earthquake, the direct simulation Monte Carlo (DSMC) method is modified by implanting a focal mechanism algorithm. We compare the results of the modified DSMC method (DSMC-2) with those of the original DSMC method (DSMC-1). DSMC-2 shows more or similarly reliable results compared to those of DSMC-1, for events with 12 or more recorded stations, by weighting twice for hypocentral distance of less than 80 km. Not only the number of stations, but also other factors such as rough topography, magnitude of event, and the analysis method influence the reliability of DSMC-2. The most reliable result by DSMC-2 is obtained by the best azimuthal coverage by the largest number of stations. The DSMC-2 method requires shorter time steps and a larger number of particles than those of DSMC-1 to capture a sufficient number of arrived particles in the small-sized receiver.

Key words: direct simulation Monte Carlo (DSMC) method, focal mechanism, number of stations, receiver problem, seismic wave attenuation.


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