腾冲火山区形变分析  

Analysis on the Deformation in Tengchong Volcanic Region

作　　者：胡亚轩[1] 王庆良[1] 赵慈平[2] 邵德晟[2] 施发奇[2] 

机构地区：[1]中国地震局第二监测中心,西安710054 [2]云南省地震局,昆明650041

出　　处：《国际地震动态》2008年第4期42-47,共6页Recent Developments in World Seismology

摘　　要：腾冲火山群是我国目前仍具喷发危险的火山群。本文首先对火山区的地壳运动背景进行了总结分析,然后介绍了火山区的形变监测情况,再依据1998～2004年的水准测量及2002～2004年GPS观测成果,参考重力变化及其它观测资料分析火山区岩浆的活动特征,最后得出主要结论:相对欧亚板块,腾冲火山区总体具有向西南的顺时针旋转运动;火山区的形变变化受岩浆和断层活动两方面控制;火山区西南部发生了较强烈的下沉运动,可能由于岩浆和水的流失及放气等原因引起;以固东—腾冲断裂的西支为界,水平位移在断层两侧分别向东西两个方向运动,2002～2003年运动更剧烈些,断层活动表现为明显的拉张特征。综合各种资料表明火山目前活动量较小,近期喷发的危险性不大。There is a eruption risk of Tengchong volcano in our country. In the paper the crustal movement in the volcanic region is summarized and analyzed at first. Then the deformation surveys are introduced. Based on the level surveys from 1998 to 2004 and GPS observations from 2002 to 2004, combined with gravity measurement and other observation data, magma active characteristics are analyzed. At last the main results have been obtained as follows： There is a clockwise rotation towards SW direction compared with EU plate; the deformation characteristic is controlled by magma activity as well as fault movement; the obvious sink occurs in the SW region, maybe it is caused by lava and underground water movement and gas release etc; The horizontal displacement shows opposite direction separated by the Gudong-Tengchong fault, in the region, and the rate of movement is a little bit higher during it is shown by the tension feature 2002-2003 period. The results show that the displacement is rather small in the region, so the eruption risk of Tengchong volcano quite low in near future.

关 键 词：腾冲火山 形变分析 岩浆活动特征 

分 类 号：P317.6[天文地球—固体地球物理学]