断层模型在火山区形变和重力反演中的应用  

APPLICATION OF FAULT MODEL IN VERTICAL DEFORMATION AND GRAVITY ANALYSES IN TENGCHONG VOLCANIC AREA

作　　者：施行觉[1] 胡亚轩[1] 毛竹[1] 赵慈平[2] 施发奇[2] 邵德晟[2] 

机构地区：[1]中国科学技术大学地球和空间学院,合肥200026 [2]云南省地震局,昆明650041

出　　处：《大地测量与地球动力学》2004年第3期24-28,共5页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金 (4 0 2 740 5 7);地震科学联合基金(10 2 0 99)

摘　　要：利用腾冲火山区 1998～ 2 0 0 2年的垂直形变和重力测量资料 ,应用多元Mogi模型对测区的等效岩浆房位置及大小进行了反演计算 ,得出了最佳拟合值。但当对形变和重力资料联合分析时却发现 :实测重力数据比用球形Mogi模型计算所得的值要大得多。为了对此进行合理的解释 ,提出了断层模型。当岩浆沿断层上升时 ,充填了断层中原先存在的大量空隙 ,因而可以只对重力产生影响 ,而不对形变产生影响。为此沿断层积分得出上升岩浆所产生的重力异常 ,其结果与实测重力资料拟合得较好。同时断层模型也对负的岩浆源 (即岩浆的流失 )Based on four years(1998-2002) vertical deformation and gravity data,we inversed the equivalent magma's position and size with the Mogi model and got best result.However,when analyzing the measured deformation and gravity together,we found a much greater value measured gravity than that calculated by the Mogi model.In order to explain the reasons,we brought forward the fault model.If the magma ascends along the fault,it will fill the plenty of space in the fault and has only influence on the gravity but not on the deformation.The gravity abnormity calculated by the integration along the fault matches very well with the measured one.On the other hand,it explained more reasonable to the negative magma which flows out.

关 键 词：断层模型 火山区 重力反演 重力测量 地表重力变化 

分 类 号：P541[天文地球—构造地质学] P317[天文地球—地质学]