Time Sequence of Deep Low-frequency Tremors in the Southwest Japan Subduction Zone
Time Sequence of Deep Low-frequency Tremors in the Southwest Japan Subduction Zone
复制标题
日本西南俯冲带深部低频震颤的时间序列
DOI：
10.5026/jgeography.112.6_837
复制
发表时间：
2003
影响因子：
3.1
通讯作者：
K. Obara
中科院分区：
文献类型：
--
作者：
K. Obara
日本西南部检测到的非火山深部低频震颤分布在沿菲律宾海板块下降走向的弧前侧。震源深度对应于板片界面或莫霍面不连续面。震颤活动的时间顺序特点是持续时间较长，从几小时到几周不等。震颤的活动性和连续发生被认为与脱水过程中从板中释放出的液体的存在有关。地震的空间分布在狭窄的带内并不均匀，而是在空间上聚集。持续时间较长的地震主要活动也呈周期性聚集，四国东部和中部地区的活动周期为2～3个月，四国西部地区的周期为6个月左右。另一方面，地震有时是由当地地震或远震波引发的。震颤活动的周期性可能代表着稳定的俯冲过程中流体的稳定积累，而触发现象则暗示着震颤发生的不稳定条件。
Non-volcanic deep low-frequency tremors detected in southwest Japan are distributed in the forearc side along the strike of the descending Philippine Sea plate. The source depth of the tremor corresponds to the slab interface or the Moho discontinuity. The time sequence of the tremor activity is characterized by long durations from hours to weeks. The mobility and the successive occurrence of the tremor are thought to be related to the existence of fluid liberated from the slab by a dehydration process. The spatial distribution of the tremors is not homogeneous in a narrow belt but is spatially clustered. The major activity of the tremors with relatively long time durations is also clustered periodically, with a period of 2-3 months in the east and middle of Shikoku area and about 6 months in the west of Shikoku. On the other hand, tremors are sometimes triggered by local earthquakes or teleseismic waves. The periodicity of the tremor activity may represent a stable accumulation of fluid with a stable subduction process and the triggering phenomenon implies the unstable condition of the occurrence of tremors.
影响因子：
2.9
作者：
HASEGAWA, A;YAMAMOTO, A
通讯作者：
YAMAMOTO, A
影响因子：
56.9
作者：
Obara, K
通讯作者：
Obara, K