五大连池火山区多震相地幔各向异性与深部动力学

批准号:
42004082
项目类别:
青年科学基金项目
资助金额:
24.0 万元
负责人:
鲁明文
依托单位:
学科分类:
油气地球物理学
结题年份:
2023
批准年份:
2020
项目状态:
已结题
项目参与者:
鲁明文
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中文摘要
五大连池火山位于我国的东北地区,最近一次喷发时间距今约300年,被认为是活火山。目前对于火山区的板块俯冲与板内火山的形成机制并不十分明确。本研究将已有的固定台站和WAVESArray密集流动台站地震观测相结合,通过收集尽可能多的流动和固定地震台站的波形资料,采用多震相XKS(SKS、PKS、SKKS)剪切波分裂方法,深入开展五大连池火山区的地幔各向异性研究,以认识火山活动机制和板块俯冲的深部动力学过程。由于流动台站的增加,在空间上对固定台站起到了很好的补充作用,使得研究区台站分布更加均匀,从而能给出火山区下方更为精细的地幔各向异性特征,为更好理解研究区的深部动力学过程提供重要的地震学证据。
英文摘要
Wudalianchi volcano is located in Northeast China. Its recent eruption is about 300 years ago and it is considered to be an active volcano. At present, the mechanism of plate subduction and formation of intraplate volcanoes are not quite clear. This study combines the permanent stations and dense WAVESArray temporary seismic stations. By collecting as many waveform data as possible, we use multi-seismic phase XKS (SKS、PKS、SKKS) shear wave splitting method to study the mantle anisotropy in Wudalianchi volcanic area, in order to understand the mechanism of volcanic activity and the deep dynamic process of plate subduction. As the temporary stations have a good complement to permanent stations, the distribution of the seismic stations in the study area is more uniform, thus we can give more details on the characteristics of mantle anisotropy, which provides important seismological evidence for further understanding the deep dynamic process in Wudalianchi volcano area.
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