吉林大学学报(地球科学版) ›› 2017, Vol. 47 ›› Issue (6): 1894-1903.doi: 10.13278/j.cnki.jjuese.201706306

• 地球探测与信息技术 • 上一篇    下一篇

吉林前郭5.8级震区上地壳速度结构

卢燕红, 吴兆营, 丁广, 付琦, 张帆   

  1. 吉林省地震局, 长春 130117
  • 收稿日期:2017-03-07 出版日期:2017-11-26 发布日期:2017-11-26
  • 通讯作者: 吴兆营(1971),男,研究员级高级工程师,博士,主要从事工程地震和地震学相关研究,E-mail:39610161@qq.com E-mail:39610161@qq.com
  • 作者简介:卢燕红(1982),女,工程师,硕士,主要从事地震编目及地震学相关研究,E-mail:9904927@qq.com
  • 基金资助:
    吉林省科技发展计划项目(20150204002SF,20130204052SF)

Upper Crustal Velocity Structure in Qianguo M5.8 Earthquake Region

Lu Yanhong, Wu Zhaoying, Ding Guang, Fu Qi, Zhang Fan   

  1. Earthquake Administration of Jilin Province, Changchun 130117, China
  • Received:2017-03-07 Online:2017-11-26 Published:2017-11-26
  • Supported by:
    Supported by Science and Technology Development Plan of Jilin Province, China(20150204002SF, 20130204052SF)

摘要: 为了更好地研究吉林前郭地区的地震活动性,本文利用2013年10月至2015年2月吉林前郭5.8级震群周围17个地震台站记录到的405个地震事件资料,共获得2 218条P波走时数据和2 166条S波走时数据,采用地震双差层析成像技术,获取吉林前郭震区上地壳三维P波、S波速度精细结构。结果显示,震区上地壳速度分层明显,P波速度变化范围为5.8~7.2 km/s,S波速度变化范围为3.4~4.0 km/s,波速比(vP/vS)变化较小。震区有低速带穿过,低速带走向为北东向,倾角较大(近直立),纵向延伸至15 km深度;震群主要位于低P波和S波速度区,对应较低的波速比。吉林前郭震区构造强度较低,受西太平洋板块俯冲产生应力场的影响,易于发生地震。

关键词: 前郭震区, 双差层析成像, 速度结构, 上地壳

Abstract: For further studying seismic activity of Qianguo in Jilin Province,we collected 405 seismic events recorded by 17 permanent and temporary stations from October 2013 to February 2015, and total 2 218 high-quality P wave arrival times and 2 166 high-quality S wave arrival times. We used double-difference tomography method to invert the upper crust P and S wave velocity structure in Qianguo region (in the region of epicentral distance range of 0-200 km). The tomography results show that the velocity structure beneath thestudy area exhibits an obvious feature of stratification, the P wave velocity varies from 5.8 km/s to 7.2 km/s,and the S wave velocity is from 3.4 km/s to 4.0 km/s, with a small change on the vP/vS ratio. A low velocity zone beneath thestudy area is found with a trend of NE direction and a nearly vertical steep dip angle, and it extends as deep as 15 km. The earthquake cluster is located in the low P wave and low S wave velocity region corresponding to a low vP/vS ratio;so we suggest that the tectonic intensity of this region is weak, and prone toearthquake under the influence of the stress field derived from the subduction of Western Pacific slab.

Key words: Qianguo seismic zone, double-difference tomography, velocity structure, upper crustal

中图分类号: 

  • P631.4
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