INVESTIGATION OF INTERNATIONAL CATALOGUES IN THE MAINLAN SOUTHEAST ASIA
Keywords:
earthquake catalogue, frequency-magnitude distribution, Southeast AsiaAbstract
The research aimed to study the quality of earthquake catalogue of the National Earthquake
Information Center (NEIC) and the International Seismological Center (ISC), with respect to the seismicity patterns of the mainland Southeast Asia. The readymade relationships between the different magnitude scales were derived to allow their convenient interconversion. Earthquake declustering was performed in order to screen the main shocks from the foreshocks and aftershocks. The NEIC’s network has gone through periods of station expansion, change in theseismic measurement system but the only major periods of rate changes were found. The ISC catalogue has gone through periods of change in seismic measurement system but the only major periods of rate changes were found. Therefore, the NEIC’s catalogue and the ISC’s catalogue ware sufficient for hazardous earthquake investigations. The results of the NEIC’s catalogue were sufficient for hazardous earthquake investigations that were recorded during 2014.0185-2017.6086 for Mw > 4.5. The FMD investigation using EMR revealed Mc of 4.5, 4.6, 4.8 and 4.5 for the 4 bulk data set. And the results of the ISC catalogue were sufficient for hazardous earthquake investigations that were recorded during 1995.2115 –2014.4836 for mb > 4.0. The FMD investigation using EMR revealed Mc of 4.1, 4.0 and 4.4 for the 3 bulk data set.
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