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| 題名: | Evidence for non-self-similarity of microearthquakes recorded at a Taiwan borehole seismometer array |
| 作者: | 馬國鳳;Lin, Yen-Yu;Ma, Kuo-Fong;Kanamori, Hiroo;Song, Teh-Ru Alex;Lapusta, Nadia;Tsai, Victor C. |
| 貢獻者: | 地球科學學院地球科學學系 |
| 日期: | 2016-08-01 |
| 上傳時間: | 2026-04-23 11:33:25 (UTC+8) |
| 出版者: | Oxford University Press;Oxford University Press (OUP) |
| 摘要: | 摘要： We investigate the relationship between seismic moment M 0 and source duration tw of microearthquakes by using high-quality seismic data recorded with a vertical borehole array installed in central Taiwan. We apply a waveform cross-correlation method to the three-component records and identify several event clusters with high waveform similarity, with event magnitudes ranging from 0.3 to 2.0. Three clusters—Clusters A, B and C—contain 11, 8 and 6 events with similar waveforms, respectively. To determine how M 0 scales with tw , we remove path effects by using a path-averaged Q. The results indicate a nearly constant tw for events within each cluster, regardless of M 0, with mean values of tw being 0.058, 0.056 and 0.034 s for Clusters A, B and C, respectively. Constant tw , independent of M 0, violates the commonly used scaling relation ${t_w} \propto M_0^{1/3}$ . This constant duration may arise either because all events in a cluster are hosted on the same isolated seismogenic patch, or because the events are driven by external factors of constant duration, such as fluid injections into the fault zone. It may also be related to the earthquake nucleation size.
出版者： Oxford University Press (OUP)
出版日期： 2016-08-01
出處： Geophysical Journal International, 2016-08, Vol.206 (2), p.757-773
版權： The Authors 2016. Published by Oxford University Press on behalf of The Royal Astronomical Society. 2016
識別號： ISSN: 0956-540X
識別號： ISSN: 1365-246X
識別號： EISSN: 1365-246X
識別號： DOI: 10.1093/gji/ggw172 |
| 顯示於類別: | [地球科學學系] 期刊論文
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