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題 名 | Source Properties of Four Microearthquakes in the New Madrid Seismic Zone=美國新馬德里地震帶的微震震源特性 |
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作 者 | 陳國誠; 邱哲明; 鍾偉瑛; | 書刊名 | 中國地質學會會刊 |
卷 期 | 40:2 1997.04[民86.04] |
頁 次 | 頁435-451 |
分類號 | 354.4 |
關鍵詞 | 經驗式格林函數; 震源參數; 新馬德里地震帶; Empirical green's function; Source parameters; New madrid seismic zone; |
語 文 | 英文(English) |
英文摘要 | 利用經驗式格林函數消除地震波的路徑、場址及儀器效應,推求美國新馬德里地 震帶的四個微震 (Md=2.1 ~ 2.4) 震源參數。此四個微震可模擬為單純的圓形破裂,其破裂 半徑介於 191 至 232 公尺,其地震矩為 6.20 ~ l1.63x10 �� dyne-cm。 而其應力降估計 為 3.9 至 6.O bars 之間,此與美國東部微震特性相吻合。 然而,與大多數的大陸板塊內 較大的地震相比較,本結果所得的應力降顯然較小。這四個地震可能代表著新馬德里地震帶 之上部地殼較為軟弱物質的破裂。 ts range from 6.20 to 11.63x10 �� dyne-cm. The estimated static stress drops vary from 3.9 to 6.0 bars, making them consistent with those of other studies of small earthquakes in the eastern U.S.. Compared with stress drops of many larger continental intraplate earthquakes, however, the results here have lower stress drops. These four events probably represent ruptures of relatively weak materials as the shallow part ofthe upper crust in the NMSZ. |
本系統中英文摘要資訊取自各篇刊載內容。