Analysis of A Deep “Non Double Couple” Earthquake Using Very Broadband Data
Analysis of A Deep “Non Double Couple” Earthquake Using Very Broadband Data
复制标题
使用超宽带数据分析深部“非双力偶”地震
DOI:
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发表时间:
1990
期刊:
影响因子:
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通讯作者:
H. Kawakatsu
中科院分区:
文献类型:
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作者:
K. Kuge;H. Kawakatsu
We analyze the source mechanism of a deep earthquake beneath Japan on January 1, 1984, whose Harvard centroid moment tensor (CMT) solution significantly deviates from a double couple mechanism. The broadband P-wave ground displacement records show the presence of several distinct phases whose relative amplitudes vary among the stations. We perform very broadband waveform analyses over four different frequency bands: CMT inversion (surface waves (4∼5mHz) and long-period body waves (12∼20mHz)), waveform inversion using the long-period P, pP and SH waves (∼0.04Hz), and broadband P- and pP-wave waveform analysis (0.03∼1Hz). We show that the large non double couple solution observed at long periods (>25 sec) is very likely to be a manifestation of the presence of subevents with different double couple mechanisms in a single rupture sequence.