Analysis of A Deep “Non Double Couple” Earthquake Using Very Broadband Data

Analysis of A Deep “Non Double Couple” Earthquake Using Very Broadband Data
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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
H. Kawakatsu
中科院分区:
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文献类型:
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作者:
K. Kuge;H. Kawakatsu

文献摘要

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本文分析了1984年1月1日日本深部地震的震源机制,其哈佛质心矩张量(CMT)解明显偏离了双偶机制。宽带P波地面位移记录显示,存在几个不同的震相,它们的相对幅度在不同台站之间有所不同。我们在四个不同的频段上进行了非常宽带的波形分析:CMT反演(表面波(4∼5 MHz)和长周期体波(12∼20 MHz)),使用长周期P、PP和SH波(∼0.04 Hz)的波形反演,以及宽带P波和PP波波形分析(0.03∼1 Hz)。我们发现,在长周期(>25秒)观察到的大的非双偶解决方案很可能是在单个破裂序列中存在具有不同双偶机制的子喷口的表现。
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.