摘要
把震源机制的分析结果和构造地质学的研究成果结合起来进行综合分析,来揭示长白山天池火山未来喷发的动力背景.深源地震的震源机制表明,西太平洋板块向我国大陆的俯冲作用,使研究区处于近E-W向的挤压状态.从浅源地震的震源机制分析发现,研究区平均最大主压应力方向为NEE-SWW向.构造地质学的研究显示,天池周边NWW向的断层在更新世晚期以来较发育.天池火山未来的喷发可能受西太平洋板块的俯冲作用及NWW向断裂的走滑活动控制.根据以上分析,提出了天池火山未来喷发的可能动力背景.
The dynamic setting for future eruption of Tianchi volcano in Changbaishan Mountain is analyzed with the focal mechanism and tectonic geology. Study on the focal mechanism of anatectic earthquake shows that subduction of the West Pacific plate to Northeast China makes the near-west-east pressure in Tianchi region. The direction of the maximum principal compressive stress axis in the area is trending NEE. Research on structural geology reveals that NWW-trending faults around Tianchi are active since late Pleistocene. The future eruption of Tianchi volcano is possibly controlled by the subduction of West Pacific plate and the NWW-trending strike-slip faulting. On this basis, the dynamic setting for the future eruption of Tianchi volcano is put forward.
出处
《地质与资源》
CAS
2008年第4期245-249,共5页
Geology and Resources
基金
国家油气中心项目(XQ-2004-07)
中石化项目(GO800-06)
中国地震局重点项目(9511030302)
国家自然科学基金项目(50278090)资助.
关键词
天池火山
板块俯冲
震源机制
最大主压应力方向
北西西向断裂
动力背景
Tianchi volcano
subduction of plate
focal mechanism
maximum principal compressive stress
NWW-trending fault
dynamic setting
