Repeating short- and long-term slow slip events with deep tremor activity around the Bungo channel region, southwest Japan

被引:202
作者
Hirose, H [1 ]
Obara, K [1 ]
机构
[1] Natl Res Inst Earth Sci & Disaster Prevent, Tsukuba, Ibaraki, Japan
来源
EARTH PLANETS AND SPACE | 2005年 / 57卷 / 10期
关键词
subduction zone; Philippine Sea plate; plate interface; Hi-net; borehole tiltmeter; GPS; slow slip patch;
D O I
10.1186/BF03351875
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
We report the repeating occurrence of short- and long-term slow slip events (SSE) which are accompanied by deep tremor activity around the Bungo channel region, southwest Japan. Both of these activities are detected by NIED Hi-net, which is composed of densely distributed observatories equipped with a set of tiltmeter and a high-sensitivity seismograph. Since the short-term SSE is small in magnitude, GPS can detect only the long-term SSE. Some of these episodes have nearly the same surface deformation pattern. This shows the existence of `slow slip patches' on a plate interface, where the episodic slow slip is the characteristic slip behavior. We observe a change in periodicity and size of the short-term episode after the onset of the long-term SSE. Moreover, the long-term slow slip accelerates when the short-term activity takes place. This suggests that there is an interaction between these two types of SSEs.
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页码:961 / 972
页数:12
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