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The 2004 sequence of triggered earthquakes off the Kii peninsula, Japan

机译:日本纪伊半岛2004年引发的地震序列

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摘要

We examine the spatial and temporal relationships of the sequence of strong earthquakes that occurred off the Kii Peninsula, Japan, on 5 September 2004. The first event (Mj 7.1) occurred at 10:07:08 (UTC) on a northward dipping plane within the subducting Philippine Sea plate. From 10:16 to 14:47 the seismicity shows a group of earthquakes (Mj 3.2 to 4.8) 35 km to the east which are regarded as foreshocks to the second large earthquake. At 14:57:17, a Mw 6.1 strike-slip event occurred on a northwest trending plane. Some 14 seconds later, a large (Mj 7.4) thrust earthquake started 4.2 km southeast of the initial epicenter of the second earthquake. This largest earthquake is thought to have occurred on a southward dipping plane with the strike in an east-southeastly direction. Using the geometry of faults determined in this study, calculations of the Coulomb failure function show that simple static stress changes do not provide a good explanation for the triggering of the subsequent earthquakes.
机译:我们研究了2004年9月5日日本纪伊半岛附近发生的强烈地震序列的时空关系。第一次地震(Mj 7.1)于10:07:08(UTC)发生在日本北倾面俯冲菲律宾海板块。从10:16到14:47的地震活动显示出东部35公里处的一组地震(Mj 3.2至4.8),被视为第二次大地震的前兆。在14:57:17,西北趋势飞机上发生了6.1兆瓦的走滑事件。大约14秒后,一场大的(Mj 7.4)逆冲地震在第二次地震的震中东南方4.2公里处开始。据认为,这次最大的地震发生在向南倾斜的平面上,走向是东-东方向。使用在这项研究中确定的断层几何形状,库仑破坏函数的计算表明,简单的静应力变化不能为随后的地震触发提供很好的解释。

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