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首页> 外文期刊>Journal of Asian earth sciences >Background and precursory seismicities along and surrounding the Kunlun fault before the M_s8.1, 2001, Kokoxili earthquake, China
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Background and precursory seismicities along and surrounding the Kunlun fault before the M_s8.1, 2001, Kokoxili earthquake, China

机译:2001年中国Kokoxili地震M_s8.1前后昆仑断裂带及其周围的背景和前兆地震活动

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摘要

The M_s8.1 Kokoxili, China, earthquake on 14 November, 2001, occurred on the western portion of the Kunlun fault. By analyzing data from geological surveys and records of historical and modem earthquakes, we know that at least 8 M_s6.9-8.1 earthquakes occurred along the Kunlun fault from 1879 AD to 2000 AD. The spatial arrangement of these ruptures indicates the existence of two rupture gaps, the Kokoxili and the Maqu, on the fault before 2001. The Kokoxili gap and surrounding area experienced a long-term seismicity quiescence of M_s ≥ 5 earthquakes and developed the corresponding background seismic gap at least from 1966 to 2001. The 2001 Kokoxili earthquake occurred on the Kokoxili gap. The Maqu gap on the eastern portion of the Kunlun fault was found to be a site where the seismicity rate of smaller earthquakes increased anomalously about 3.4 years before the Kokoxili earthquake. We analyze this anomalous increase in seismicity rate and conclude that it was a significant precursor of the Kokoxili earthquake. The cases in this study suggest that rupture gaps on a great inland strike-slip fault zone could be sites of potentially major or great earthquakes, or sites of precursory seismicities, emerging prior to major or great earthquakes on the same fault zone.
机译:2001年11月14日,中国科科西里M_s8.1地震发生在昆仑断裂的西部。通过分析地质调查的数据以及历史和现代地震的记录,我们知道,从1879年到2000 AD,昆仑断裂沿线至少发生了8次M_s6.9-8.1地震。这些破裂的空间排列表明,在2001年之前,该断裂带上存在两个破裂带,分别为Kokoxili和Maqu。Kokoxili间隙和周边地区经历了M_s≥5级地震的长期地震活动静息,并发展了相应的背景地震至少从1966年到2001年。2001年的Kokoxili地震发生在Kokoxili缝隙上。发现昆仑断裂带东部的玛曲缝隙是一个地方,小地震的地震发生率在可可西里地震发生前约3.4年反常增加。我们分析了这种地震活动率的异常增加,并得出结论,这是科科西里地震的重要先兆。本研究中的案例表明,一个大的内陆走滑断层带的破裂带可能是潜在的大地震或大地震的地点,或者是在同一断层带的大地震或大地震之前出现的先验地震活动的地点。

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