琼北火山群形成的动力学机制及地震现象的新认识  

Dynamic mechanism of volcanic belt and new understanding from earthquake evidence in Northern Hainan Island,China

作　　者：刘辉[1] 洪汉净[1] 冉洪流[1] 沈繁銮[2] 赵波[1] 陈会仙[1] 

机构地区：[1]中国地震局地质研究所,北京100029 [2]海南省地震局,北京570203

出　　处：《地球物理学报》2008年第6期1804-1809,共6页Chinese Journal of Geophysics

基　　金：中国地震局“十五”规划海口市地震活断层探测子专题(0106515);十一五国家科技支撑计划项目(2006BAC01B040104);国家自然科学基金项目(40674056)共同资助

摘　　要：分析世界火山分布图发现琼北火山群分布在一南北向的火山带上,应用有限元方法模拟计算了双俯冲作用下海南岛所在雷琼-越东火山带的形成机制,结合海南岛精确定位的地震数据和形变观测结果,认为琼北地区可能存在岩墙侵入或张性断裂膨胀,并根据地震数据模拟分析了岩墙侵入对区域应力场及形变的影响.琼北地区精确地震（2000-2006）定位结果表明地震主要集中在一个垂直面上,并且地震带两端有分叉现象.通过地震时空分布特征推测存在岩墙侵入,并通过数值模拟很好地解释了琼北地区地震的分布特征（狗骨头状）以及地表垂向形变东升西降的特征.trending volcanic （ Indian subducti The world volcano map shows that on the Northern Hainan Islan intraplate volcanic belt. In order to understand the mechanism of belt zone finite element method has been applied to simulate the d plate subduction and Philippine plate subduction）. The results on induces double convection and between the two subduction zones from the upper mantle to the surface, which is a possible reason volcanic belt. Be vertical earthqua considering distribution the sides this result, the accurate ke plane, we assume it is geological and geophysical of earthquake and st deformation pattern by simulating information. ress, also the ＂rising in the dyke intrusion, which d there is a NS-formation of the ouble subduction show that double forms an upwelling of the NS-trending intraplate kes from 2000 to 2006 shows a intrusion in a vertical dyke We get the ＂ dog-bone＂-shaped east and falling in west＂ vertical are the same as the actual results.

关 键 词：双俯冲 岩墙侵入 海南岛 有限元 火山 

分 类 号：P315[天文地球—地震学] P317[天文地球—固体地球物理学]