华县8(1/4)级大地震的深部地球介质背景  

THE BACKGROUND OF DEPTH EARTH MEDIUM OF BIG EARTHQUAKE WITH M8(1/4) IN HUA COUNTY

作　　者：王卫东[1] 张永志[1] 吴芳[1] 狄秀玲[2] 孟智民[2] 

机构地区：[1]长安大学地质工程与测绘工程学院,陕西西安710054 [2]陕西省地震局,陕西西安710068

出　　处：《内陆地震》2007年第1期14-18,共5页Inland Earthquake

基　　金：国家自然科学基金重点项目(40534021);国土资源大调查项目(200416000001)

摘　　要：从渭河断陷盆地的地壳速度场、介质品质因子等地球物理场的分布探讨了华县大地震的深部地球介质背景。结果表明,华县8(1/4)级大地震震中位于高Q值区和低Q值区的过渡带上,其孕震区是地壳内的高Q值低速区,该地震的孕育与地壳内的低速高导层、地幔上隆、孕震区内的断层及微裂隙中流体的存在与作用是密切相关的。Abstract- From the distributions of geophysics field such as the crust velocity field and medium quality factor in Weihe River breaks and falls basin, we has discussed the background of the depth Earth medium about the big earthquake of Hua county. The result indicated that the epicenter of the big earthquake with M 8 1/4 in Hua county located in the transition belt of high Q value and the low Q value. Its gestation earthquake area locates in the low speed area of high Q value in the earth＇s crust. The gestation of the earthquake is the close correlations with the low speed and high conduction shell of the earth＇s crust, the upheaval of the mantle, the fault of the gestation earthquake and the existence and the function of the fluid in micro crevasse.

关 键 词：渭河断陷 华县大地震 地球深部介质 地震成因 

分 类 号：P315.2[天文地球—地震学]