• 责任者：Yang Wei (Institute of Geophysics ; China Earthquake Administration ; Beijing 100081 ; China) ; Ge Hongkuai
• 刊名：Chinese Journal of Geophysics
• 出版年：2010
• 卷期：53(5)
• 关键词：强震 ; strong earthquakes ; 地震前兆 ; precursor ; 四川 ; Sichuan Province
• 页码：p.1149-1157
• 图表：9 illus., 1 table, 32 refs.
• 分类号：0500
• issnNo：ISSN0001-5733
• isbnNo：CN11-2074/P

The stress status change and its exact measurement of the fault zone has been a hotspot in geophysics. After the Wenchuan earthquake, the authors carry out continuous monitoring across the range-front fault of the Longmenshan fault zone, using a 10-ton precisely controlled active source. An M_s5.6 earthquake happened at 02∶03 in the morning of June 30th 2009 near the experimental site, and the direct S wave velocity across the fault zone occurred a slight change by comparative analysis of data before and after the earthquake. Time delay is up to 5~9 ms, the S wave velocity decreased ~0.3%. The time delay was mainly caused by the stress change within the fault zone due to the earthquake.