渭河断陷及邻近地区地壳S波速度图象  

THE CRUSTAL SEISMIC S WAVE VELOCITY IMAGE IN THE WEIHE DOWNFAULTED BASIN AND ITS ADJACENT AREAS

作　　者：袁志祥[1] 丁韫玉[1] 狄秀玲[1] 

机构地区：[1]陕西省地震局地震研究所

出　　处：《地震地质》1999年第1期9-11,共3页Seismology and Geology

基　　金：地震科学联合基金

摘　　要：选取１０４～１１２°Ｅ，３２．５～３８°Ｎ区域内陕西、山西、河南、湖北、甘肃、宁夏等省区的区域地震台网１９８４～１９９３年的１９４６个天然地震的Ｓ波观测资料，用地震层析成像方法反演了渭河断陷及其邻近地区的地壳Ｓ波速度图象，其结果表明地壳深部Ｓ波速度结构的不均匀性与该区大地构造单元、断裂构造及地震活动密切相关。The S wave data are selected from the records of 1 946 earthquakes observed in the period from 1984 to 1993 by seismic network in the zone of 104～112°E, 31.5～38°N in Shaanxi, Shanxi, Henan, Hubei, Gansu and Ningxia Provinces.The S wave velocity image of the crust beneath the Weihe downfaulted basin and adjacent areas is obtained by means of seismic tomographic technique. The results show that the non uniform S wave velocity structure of deep crust is closely related to the difference of geotectonic element,fault structure and seismic activity.

关 键 词：渭河地堑系 地震层析成像 S波 波速构造 断陷 

分 类 号：P315.2[天文地球—地震学] P315.63[天文地球—固体地球物理学]