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Aftershock analysis in the mainland Southeast Asia |
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| รหัสดีโอไอ | |
| Title | Aftershock analysis in the mainland Southeast Asia |
| Creator | Premwadee Traitangwong |
| Contributor | Santi Pailoplee |
| Publisher | Chulalongkorn University |
| Publication Year | 2561 |
| Keyword | Earthquake prediction, Earthquakes -- Southeast Asia, พยากรณ์แผ่นดินไหว, แผ่นดินไหว -- เอเชียตะวันออกเฉียงใต้ |
| Abstract | In this study, the characteristics of the aftershock in the mainland Southeast Asia (MSEA) were investigated using the several seismological techniques, i.e., i) the Gutenberg-Richter relationship (G-R relationship) ii) the modified Omori’s law iii) the Bath’s law and iv) the fractal dimension. After declustering, 1,697 clusters during 1985-2017, which represent the aftershocks occurring after mainshock were investigated in 13 seismic source zones recognized in the MSEA. According to the Bath’s law, the maximum magnitude of the aftershock depends on the magnitude of the mainshock, with the difference value between 0.4-2.5. In the intraplate zone, it is less than in the interplate zone, especially in Western Thailand and Southern Thailand zones (0.4-0.7). Next, the decay rate of the aftershock and the number of aftershocks based on the modified Omori’s law are positive relation with the magnitude of mainshock. After that the fractal dimension (Dc) for 13 zones are approximately 2.0, which means the distribution of the aftershocks in the MSEA are distributed into two-dimensional fault plane.In addition, for the spatial investigation, the b values of aftershock from the G-R relationship are in range of 0.8-1.8 that different from the mainshock. While for the temporal investigation, it is confirmed that the beginning of the mainshock is high stress, and then gradually release the accumulated stress. Finally, the relationship of the Dc and b values is positive correction as well as the relationship of the Dc values and a-b ratios. |
| URL Website | cuir.car.chula.ac.th |
