SEISMOLOGY AND GEOLOGY ›› 1999, Vol. 21 ›› Issue (1): 9-17.

• Brief Report • Previous Articles     Next Articles

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

Yuan Zhixiang, Ding Yunyu, Di Xiuling   

  1. Earthquake Research Institute, Seismological Bureau of Shaanxi Provinde, Xi’an 710068
  • Received:1998-02-28 Revised:1998-09-30 Online:1999-03-10 Published:2009-11-25

渭河断陷及邻近地区地壳S波速度图象

袁志祥, 丁韫玉, 狄秀玲   

  1. 陕西省地震局地震研究所, 西安, 710068
  • 基金资助:
    地震科学联合基金资助(95208).

Abstract: 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.

Key words: Weihe graben system, Seismic tomography, S-wave, Velocity structure

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。

关键词: 渭河地堑系, 地震层析成像, S波, 波速构造