Observational Research on the Generating Mechanism of volcanic tremor and volcanic earthquakes observed at Iwate Volcano
岩手火山观测到的火山震和火山地震发生机制的观测研究
基本信息
- 批准号:09640499
- 负责人:
- 金额:$ 1.6万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (C)
- 财政年份:1997
- 资助国家:日本
- 起止时间:1997 至 1998
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Volcanic tremor was first observed at Iwate volcano on Sep.15, 1995. Since then, the activities of volcanic tremor and volcanic earthquakes have been at a high level. To investigate the seismic activity, We installed a dense seismic observation network. Precise observation revealed the temporal changes in mode of activity and in hypocenter distribution. The seismic activity started in 1995 as volcanic tremor consisting of successive low-frequency earthquake about 10 km beneath the eastern flank. But, a series of severe activity of high-frequency earthquakes took plane at West Iwate volcanoes in 1998. The most distinctive feature of the activity in 1998 is that the seismic source region expanded westward in the period from March to July. Finally the source region was formed beneath a narrow area elongated about 10 km in E-W direction from the summit to the west end of West Iwate volcano.Significant volcanic ground deformations accompanying the seismic activity were observed by GPS observations and also by strain and tilt observations. The horizontal displacements observed by GPS were analyzed using an isotropic pressure source model. The migration of the pressure source (increase in pressure) from a part about 10 km beneath the eastern region of West Iwate volcanoes to a part a few km beneath the west end of West Iwate volcanoes was revealed, It is noteworthy that the pressure source is located nearly beneath the west end of the expanding seismic region. That is to say the westward expansion of the seismic source region and the westward migration of the pressure source took place simultaneously.We interpret the phenomenon means that the both of seismic activities and ground deformations were caused by an intrusion and migration of some magmatic liquid from a deeper part near the summit to a western shallower part.
1995年9月15日,岩手火山首次观测到火山震动。此后,火山震动和火山地震的活动一直处于较高水平。为了调查地震活动,我们安装了密集的地震观测网。精确的观察揭示了活动方式和震源分布的时间变化。地震活动始于1995年,由东侧下方约10公里处接连发生的低频地震组成的火山震动开始。但是,1998年,西岩手岛火山发生了一系列强烈的高频地震。1998年地震活动的最大特点是震源区在3~7月期间向西扩展。最后,震源区形成在从岩手西火山顶端到西端沿东西方向延伸约10公里的狭窄区域下。GPS观测以及应变和倾斜观测都观察到了伴随地震活动的显著火山地面变形。利用各向同性压力源模型对GPS观测的水平位移进行了分析。揭示了压力源从西岩手岛火山东区下方约10公里处向西岩手岛西端下方几公里处的迁移,值得注意的是,压力源几乎位于扩张地震区的西端下方。即震源区向西扩展和压力源向西迁移同时发生。我们解释说,这一现象意味着地震活动和地面变形都是由一些岩浆液体从靠近山顶的深部向西部浅部侵入和迁移造成的。
项目成果
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