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来自公元2000年伊祖岛地震群的证据表明,压力率决定了地震性

Shinji Toda¹, Ross S Stein, Takeshi Sagiya

¹Active Fault Research Center, Geological Survey of Japan, AIST, Tsukuba 305-8567, Japan. s-toda@aist.go.jp

|September 6, 2002

概括

岩入侵大大增加了地震群的发生率,并缩短了余震的持续时间. 这种地震性与岩入侵直接相关.

科学领域:

地球科学地球科学地球科学
地震学地震学
火山学火山学是一门学科.

背景情况:

岩入侵导致远离管道的地震,其特点是群.
与典型的地震事件相比,这些地震群体表现出独特的迁移模式和缩短的余震持续时间.

研究的目的:

为了研究岩入侵压力和地震群体特征之间的关系.
了解火山事件期间突然的地震性变化和改变的余震衰变背后的机制.

主要方法:

从一个主要的堤入侵事件的地震性数据的分析.
计算由岩入侵引起的应力率.
观察到的地震率和余震持续时间与理论模型的比较.

主要成果:

在堤防入侵期间,地震发生率增加了1000倍.
记录了余震持续时间的1000倍减少.
地震性率与应力率正相关;余震持续时间与逆相关.

结论:

这项研究提供了证据,支持在岩入侵期间产生地震的速度/状态宪法.
来自各种地质来源的压力率持续增加,可以解释地震群现象.
这项研究提供了关于火山和构造活跃地区地震危险评估的见解.

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