Matched-Filter Analysis of Geomagnetic Profile Anomaly in Eastern Dabie Orogenic Belt and Research on Seismic Activity
详细信息
- 责任者：Xu Rugang (Earthquake Administration of Anhui Province ; Hefei 230031 ; China) ; Zhang Yi
- 刊名：Northwestern Seismological Journal
- 出版年：2012
- 卷期：34(4)
- 关键词：居里点 ; Curie point ; 莫霍间断面 ; Mohorovicic discontinuity ; 大别山 ; Dabie Mountains
- 页码：p.383-387
- 图表：2 illus., 30 refs.
- 分类号：0400
- issnNo：ISSN1000-0844
- isbnNo：CN62-1048/P
摘要
Using matched-filter method,the geomagnetic anomaly data from profiles of Luan-Yingshan (Ⅰ),Baitafan-Wuwei (Ⅱ) and Jinzhaiqingshan-Wanfuhu (Ⅲ) in eastern Dabie orogenic belt are processed,the local anomalous field is extracted from regional field.Based on regional anomalous field,the buried depth of Curie surface along profiles are calculated using the approximate linear invertion method.Combined with the geological results and earthquakes distribution in this area,the relations between seismic activity and Curie surfaces,and the seismogenesis mechanism are researched preliminarily.The results show that the curves of geomagnetic anomaly exhibit the various characteristics and differences of structural basements of different profiles,existing apparent mirror image relationship with the depth of Curie surfaces.The corresponding relation between earthquakes distribution and Curie surface is apparent,most earthquakes occur on gradient zone of Curie surface.Thermal stress generated from temperature difference of gradient zone might be direct dynamic sources of Houshan area.
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