On Tidal Force Triggering of the Wenchuan Ms8.0 Earthquake and its Strong Aftershocks
详细信息
- 责任者：Chen Daqing (Earthquake Administration of Guangdong Province ; Guangzhou 510070 ; China) ; Yang Maling
- 刊名：Earthquake
- 出版年：2011
- 卷期：31(2)
- 关键词：汶川地震2008 ; Wenchuan earthquake 2008 ; 引潮力 ; tidal force ; 龙门山断裂带 ; Longmenshan Fault Zone
- 页码：p.24-32
- 图表：4 illus., 2 tables, 10 refs.
- 分类号：0500
- 出版序号：751
- issnNo：ISSN1000-3274
- isbnNo：CN11-1893/P
摘要
By calculating the azimuth, phase angle and change rate of tide force at the times of occurrences of the Wenchan Ms8.0 earthquake and 20 aftershocks Ms≥5.0, and contrasting with their rupture types, the authors find that the angles between the direction of the horizontal tidal and compressive principal stress are within 33° for 6 earthquakes in 11 reverse earthquakes. All of the vertical phase angles of 8 strike-slip earthquakes are in the up peak period, and 2 normal earthquakes’ vertical phase angles are in the downward peak. Based on statistical phenomenon, the authors discussed the mechanism of tidal force triggering of the Wenchuan Ms8.0 Earthquake and its strong aftershocks.
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