Estimating the Radiated Seismic Energy of the 2010 ML 6.4 JiaSian, Taiwan, Earthquake Using Multiple-Event Analysis
Through a proposed multiple-event analysis of teleseismic P-waves, this study investigated the radiated seismic energy and rupture process of the 2010 JiaSian earthquake. Results showed that the earthquake comprised at least two sub-events. The first sub-event was followed by the second sub-event, ~...
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| Format: | Article |
| Language: | English |
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Springer
2012-01-01
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| Series: | Terrestrial, Atmospheric and Oceanic Sciences |
| Subjects: | |
| Online Access: |
http://tao.cgu.org.tw/images/attachments/v234p459.pdf
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| Summary: | Through a proposed multiple-event analysis of teleseismic P-waves, this study investigated the radiated seismic energy and rupture process of the 2010 JiaSian earthquake. Results showed that the earthquake comprised at least two sub-events. The first sub-event was followed by the second sub-event, ~1.7 s later. The entire source duration was 5.4 s. Let the two sub-events occur on the same fault plane with a strike of 304¢X and a dip of 28¢X; the first sub-event had a relatively smaller seismic moment (M0) and larger radiated seismic energy (ES) than the second sub-event, and this leads to the ES/M0 of the first sub-event larger than that of the second sub-event thus. This feature implies that the first sub-event probably had a higher static stress drop during faulting. The total M0 was estimated to be 2.17 ¡_ 1018 Nm, corresponding to MW = 6.15, and the total ES was ~2.91 ¡_ 1013 Nm, larger than that estimated only from a single source. Subsequently, the ES/M0 was approximately 1.3 ¡_ 10-5, lower than ordinary earthquakes. The low static stress drop was probably responsible for the low ES/M0. Overall, the 2010 JiaSian earthquake was characterized by a relatively low ES/M0 and low static stress drop, and then the partial stress drop model would be relatively appropriate to interpret its rupture process. |
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| ISSN: | 1017-0839 2311-7680 |