地震地质 ›› 2000, Vol. 22 ›› Issue (3): 210-215.

• 构造地质 •    下一篇

利用遥感技术研究断层现今活动的探索--以玛尼地震前后断层相互作用为例

马瑾, 单新建   

  1. 中国地震局地质研究所,中国地震局构造物理开放实验室, 北京 100029
  • 收稿日期:2000-05-31 修回日期:2000-05-31 出版日期:2000-09-06 发布日期:2009-11-25
  • 基金资助:
    国家自然科学基金项目(49672151,49802027);国家重点基础研究专项经费(G1998040704)共同资助;中国地震局地质研究所论著2000B0029

AN ATTEMPT TO STUDY FAULT ACTIVITY USING REMOTE SENSING TECHNOLOGY-A CASE OF THE MANI EARTHQUAKE

Ma Jin, Shan Xinjian   

  1. Institute of Geology & Laboratory of Tectonocphysics, China Seismological Bureau, Beijing 100029
  • Received:2000-05-31 Revised:2000-05-31 Online:2000-09-06 Published:2009-11-25

摘要: 在前人工作的基础上,提出了利用遥感技术探测活动断层现今活动的新思路。以1997年玛尼7.9级地震为例,研究了地震前后震中周围地区地温图像的动态演化。研究证实在玛尼地震前20d阿尔金断裂带的东段就开始出现增温现象,然后逐渐扩展,形成了明显的条带。这条带一直持续到11月8日玛尼强震的发生。地震后此增温异常条带逐渐消逝。而引发玛尼地震的玛尔盖茶卡断层在震前2d才开始出现增温异常。图像的变化过程显示,玛尼地震与阿尔金断裂带活动的明显增强过程之间有着一定的对应关系,说明两断层间存在相互作用以及变形异常-断层现今活动-地震三者间有密切关系。此外,还针对深入研究断层现今活动及断层相互作用的需求,提出了技术改进措施。

关键词: 断层现今活动, 遥感技术, 地温, 热红外异常

Abstract: On the basis of previous studies of other researchers, we propose a new approach to detect present-day activities of faults using remote sensing. We have studied the dynamic changes of ground temperature around the epicenter before and after the Mani MS7.9 earthquake of 1997. It is found that an anomalous increase of ground temperature occurred at the east section of the of Altyn Tagh fault 20 days before the event. Then this anomalous area expanded gradually, formed a remarkable belt which remained till the occurrence of the MS7.9 earthquake. After the event this belt of anomaly was fading away, while such an anomaly appeared on the seismogenic fault-the Margaichace fault as late as two days before the Mani MS7.9 event. The evolution process of the image shows that there is some corresponding relationship between the Mani earthquake and evident activity of the Altyn Tagh fault. It also indicates the interaction between the two faults mentioned above as well as the close relation among the deformation anomaly, present-day fault activity and earthquakes. In addition, we propose improvement of the technique for the requirement of the study on present-day activity and interaction of faults.

Key words: Present-day fault activity, Remote sensing, Ground temperature, Thermal infrared anomaly