Depth-dependent activity of non-volcanic tremor in southwest Japan
Depth-dependent activity of non-volcanic tremor in southwest Japan
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DOI：
10.1029/2010gl043679
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发表时间：
2010-07-10
影响因子：
5.2
通讯作者：
Matsuzawa, Takanori
中科院分区：
文献类型：
--
作者：
Obara, Kazushige;Tanaka, Sachiko;Matsuzawa, Takanori
利用一种新的定位方法，我们获得了日本西南部菲律宾海板块俯冲带沿着非火山地震的高分辨率地图，并阐明了地震活动的深度依赖行为。在频繁检测到短期慢滑事件（SSE）和极低频地震的地区，沿倾角的双峰分布是明显的。双峰的分离深度为5至10公里。上倾震颤活动发生的间歇性，符合主要的爆发，往往伴随着大地可检测的SSE。然而，下倾震颤活动相当稳定，经常发生轻微的爆发。这种深度相关的震颤活动可能反映了板间滑动特性的变化，特别是随着深度和温度的增加而减弱。在四国最西端，2003年末仅在上倾部分检测到异常震颤活动。这被解释为是由地震带较浅边缘的长期SSE触发的。引文：Obara，K.，S.田中T. Maeda和T. Matsuzawa（2010），日本西南部非火山震颤的深度相关活动，Geophys。保留信函：37，L13306，doi：10.1029/2010GL043679。
With a new location method, we obtained a high-resolution map of non-volcanic tremor along the subducting Philippine Sea plate in southwest Japan and clarified the depth-dependent behavior of the tremor activity. A bimodal distribution of tremor along-dip is apparent in regions where short-term slow slip events (SSEs) and very-low-frequency earthquakes are frequently detected. The separation of bimodal peaks is 5 to 10 km in depth. The updip tremor activity occurs episodically, coincident with major bursts that often accompany geodetically detectable SSEs. The downdip tremor activity is, however, rather stable with frequent minor bursts. This depth-dependent tremor activity likely reflects variation of interplate slip properties, specifically weakening with increasing depth and temperature. In westernmost Shikoku, anomalous tremor activity was detected in only the updip section in late 2003. This is interpreted as being triggered by a long-term SSE in the shallower edge of the tremor zone. Citation: Obara, K., S. Tanaka, T. Maeda, and T. Matsuzawa (2010), Depth-dependent activity of non-volcanic tremor in southwest Japan, Geophys. Res. Lett., 37, L13306, doi: 10.1029/2010GL043679.