Non-volcanic tremor and low-frequency earthquake swarms
Non-volcanic tremor and low-frequency earthquake swarms
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DOI：
10.1038/nature05666
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发表时间：
2007-03-15
期刊：
影响因子：
64.8
通讯作者：
Ide, Satoshi
中科院分区：
文献类型：
--
作者：
Shelly, David R.;Beroza, Gregory C.;Ide, Satoshi
非火山地震是在一些主要断层上偶尔观察到的一种微弱的、持续时间较长的地震信号，通常与缓慢滑动事件(1-4)结合在一起。这种震颤可能是理解断层深层基本过程的关键，并可能预示着加速滑动的次数，从而增加了地震风险。然而，震颤产生的机制及其与无震滑动的关系仍未解决。在这里，我们论证了日本四国之下的地震可以解释为一群小的低频地震，每一次地震都发生在俯冲-带状板块界面上的剪切断层上。这表明震颤和缓慢滑动是单一过程的不同表现形式。
Non-volcanic tremor is a weak, extended duration seismic signal observed episodically on some major faults, often in conjunction with slow slip events(1-4). Such tremor may hold the key to understanding fundamental processes at the deep roots of faults, and could signal times of accelerated slip and hence increased seismic hazard. The mechanism underlying the generation of tremor and its relationship to aseismic slip are, however, as yet unresolved. Here we demonstrate that tremor beneath Shikoku, Japan, can be explained as a swarm of small, low-frequency earthquakes, each of which occurs as shear faulting on the subduction-zone plate interface. This suggests that tremor and slow slip are different manifestations of a single process.