Tidal Response in Shallow Tectonic Tremors
Tidal Response in Shallow Tectonic Tremors
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浅层构造震动的潮汐响应
DOI：
10.1002/2017gl074060
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发表时间：
2017
影响因子：
5.2
通讯作者：
Ohta K.
中科院分区：
文献类型：
--
作者：
Katakami S.;Yamashita Y.;Yakihara H.;Shimizu H.;Ito Y.;Ohta K.
各种类型的慢地震（例如，构造地震和缓慢滑动事件）在构造带，特别是在俯冲带中已被报道。地震的潮汐响应被认为与板块界面的弱摩擦状态密切相关，许多研究报告了潮汐与深震活动之间这种相关性的观测证据。在这里，我们使用修改后的频率扫描方法在一个单一的站，以检测微构造地震，以前没有报告在九州南部。在地震活动的早期阶段，地震主要受到慢滑事件的调制。与此相反，我们发现了地震响应的海洋潮汐在后期在较浅的部分俯冲带。这可能表明，地震是由潮汐变化引起的断层弱化，由于缓慢的滑动事件，如更深的条件相同。
Various types of slow earthquakes (e.g., tectonic tremors and slow slip events) have been reported in tectonic zones, especially in the subduction zone. The tidal response of a tremor is considered to be strongly related to the weak friction state of the plate interface, and many studies have reported observational evidence of such correlation between tides and deep tremor activity. Here we used the modified frequency scanning method at a single station to detect micro tectonic tremors that have not been previously reported in southern Kyushu. In the early stage of the tremor activity, tremors are mostly modulated by slow slip events. In contrast, we found a seismic response to ocean tides during the later stage in the shallower part of the subduction zone. This might indicate that the tremors are triggered by tidal changes caused by fault weakening due to slow slip events as same as deeper condition.