首页|期刊导航|中国地震研究（英文版）|Fracture Characters and Seismogenic Fault of the Yajiang Earthquake Sequence with Ms6.0 in Sichuan in 2001
中国地震研究（英文版）2004，Vol.18Issue(3)：212-224,13.
Fracture Characters and Seismogenic Fault of the Yajiang Earthquake Sequence with Ms6.0 in Sichuan in 2001
Fracture Characters and Seismogenic Fault of the Yajiang Earthquake Sequence with Ms6.0 in Sichuan in 2001
摘要
Abstract
The Yajiang earthquake sequence in 2001, with the major events of Ms 5.1 on Feb. 14 and of Ms 6.0 on Feb. 23, are significant events in the Sichuan region during the last 13 years.Eighty-eight earthquakes in the sequence with at least 5 distinct onset parameters for each recorded by the Sichuan Seismic Network in the period of Jan. 1 through June 30, 2001 were chosen for this study. The events are relocated and the focal mechanism is derived from P-wave onsets for 13 events with relatively larger magnitudes. The focal depth of all earthquakes fall between a range of 2km to 16km, with dominant distribution between 9km to 11km. The foreshocks, the Ms5.1 earthquake and the Ms6.0 earthquake and their aftershocks are all located close to the Zihe fault and the dominant epicentral distribution is in NW direction,identical to that of the fault. The fracture surface of the focal mechanism is determined in accordance to the mass transfer orientation in the recent earth deformation field in the Yajiang region. The P axes of the principal compressive stress in focal mechanism solutions of the 13events show bigger vertical components, and the horizontal projection trending SE. The earthquakes are of left-lateral, strike-slip normal, and normal strike-slip types. The rupture surface of most earthquakes strike NW-SE, dipping SW. Based on the above information, we conclude that the Zihe fault that crosses the earthquake area, striking NW and dipping SW, is the seismogenic fault for the Yajiang earthquake sequence.关键词
Yajiang earthquake sequence/Zihe fault/Fracture characters/Focal stress field/Seismogenic faultKey words
Yajiang earthquake sequence/Zihe fault/Fracture characters/Focal stress field/Seismogenic fault分类
天文与地球科学引用本文复制引用
Long Sisheng..Fracture Characters and Seismogenic Fault of the Yajiang Earthquake Sequence with Ms6.0 in Sichuan in 2001[J].中国地震研究（英文版）,2004,18(3):212-224,13.基金项目
The project is sponsored as a sub-project under the 10th "Five-Year Plan" for Science and Technology Development. （）
