地震地质 ›› 2017, Vol. 39 ›› Issue (3): 605-622.DOI: 10.3969/j.issn.0253-4967.2017.03.012

• 研究论文 • 上一篇    

利用背景噪声成像技术反演宁夏及邻区S波速度结构

谢辉1, 马禾青1, 焦明若2, 马小军1, 张楠1, 李青梅1   

  1. 1 宁夏回族自治区地震局, 银川 750001;
    2 辽宁省地震局, 沈阳 110034
  • 收稿日期:2016-05-18 修回日期:2016-07-14 出版日期:2017-06-20 发布日期:2017-07-20
  • 作者简介:谢辉,女,1982年生,2015年于中国科学技术大学获地质工程硕士学位,工程师,主要从事地震学研究和地震观测工作,E-mail:huix5719@163.com。
  • 基金资助:
    地震科技星火计划(XH14051YSX)与宁夏回族自治区自然科学基金(NZ15213)共同资助

THE INVERSION OF S-WAVE VELOCITY STRUCTURE IN NINGXIA AND ITS ADJACENT AREA USING BACKGROUND NOISE IMAGING TECHNOLOGY

XIE Hui1, MA He-qing1, JIAO Ming-ruo2, MA Xiao-jun1, ZHANG Nan1, LI-Qing-mei1   

  1. 1 Earthquake Administration of Ningxia Hui Autonomous Region, Yinchuan 750001, China;
    2 Earthquake Administration of Liaoning Province, Shenyang 110034, China
  • Received:2016-05-18 Revised:2016-07-14 Online:2017-06-20 Published:2017-07-20

摘要: 利用宁夏及邻区90个地震观测台站记录的2012年1月至2013年12月地震波形数据,根据噪声成像方法得到研究区瑞利面波群速度频散资料,获得了宁夏及邻区下方地壳上地幔三维S波速度结构。结果表明,在10~40km深度范围内,银川地堑和六盘山断裂带下方呈现出低速异常体,随着深度的增加低速异常在阿拉善地块与青藏高原NE缘弧形构造区之间成为环绕兰州盆地的低速异常区;研究区地壳及上地幔三维S波速度结构存在明显的横向不均匀性。这些结果对于研究宁夏及邻区活动构造带的动力学和强震发震机理有意义。

关键词: 背景噪声成像, 互相关, 频散曲线, S波速度结构, 宁夏及邻区

Abstract: In this paper, we use seismic waveform data of 90 seismic stations in Ningxia and its adjacent areas recorded between January 2012 and December 2013 to obtain the Rayleigh surface wave group velocity dispersion of the study area according to the noise imaging method and the 3-D S-wave velocity structure of the crust and upper mantle in Ningxia and its adjacent regions. The results show that within the depth range of 10~40km in Yinchuan graben and Liupanshan fault belt there exists a slow anomaly body, and with the increase of the depth this slow anomaly becomes an abnormal slow zone surrounding Lanzhou Basin between the massif arcuate structure of northeastern margin of Tibet Plateau and Alxa block. The 3-D S-wave velocity structure of the crust and upper mantle of the study area presents obvious lateral inhomogeneity. These results have important significance for the study of the dynamics of active tectonic zones and mechanism of strong earthquakes in Ningxia and its adjacent areas.

Key words: background noise imaging, cross correlation, dispersion curve, S-wave velocity structure, Ningxia and its adjacent regions

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