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2004年阳江MS4.9地震震源参数分析
引用本文:康英,杨选,吕金水,叶繁英.2004年阳江MS4.9地震震源参数分析[J].地震,2005,25(3):109-114.
作者姓名:康英  杨选  吕金水  叶繁英
作者单位:广东省地震局,广东,广州,510070
基金项目:国家重点基础研究发展计划(973计划)
摘    要:利用广东数字地震台网的资料计算了2004年9月17日广东阳江Ms4.9地震的震源机制为:节面走向57°,倾角47°,滑动角69°,主压应力方向342°,倾角0°,主张应力方向252°,倾角75°,属逆断层性质;地震矩为1.69×1015N·m,应力降为1.7 MPa,震源半径为876 m.根据阳江地区震前22个ML>2.5的中小地震震源参数,得到一些经验关系.S波拐角频率随时间的变化显示出Ms4.9地震前有下降趋势;阳江序列P轴方位角的变化显示出震前4个月应力开始趋于一致.

关 键 词:震源参数  震源机制  阳江MS4.9地震  拐角频率
文章编号:1000-3274(2005)03-0109-06
收稿时间:2004-11-03
修稿时间:2004-12-17

Analysis on the source parameters of Yangjiang earthquake with Ms4.9 in 2004
KANG Ying,YANG Xuan,LU Jin-shui,YE Fan-ying.Analysis on the source parameters of Yangjiang earthquake with Ms4.9 in 2004[J].Earthquake,2005,25(3):109-114.
Authors:KANG Ying  YANG Xuan  LU Jin-shui  YE Fan-ying
Abstract:According to the Guangdong Digital Seismic Network records, the focal mechanism is obtained from the earthquake (M_S4.9) in Yangjiang on September 17, 2004. The strike is 57, the dip angle is 47 and the rake is 69 of the nodal plane, the azimuth and the dip angle of principal compressional stress axes P is 342 and 0, respectively; the azimuth and the dip angle of principal extensional stress axes T is 252 and 75, respectively, the type is reverse faulting. The seismic moment is 1.6910~(15) Nm, the stress drop is (1.7) MPa, the source radius is 876m of this earthquakes. Some relations are obtained by analyzing source parameters of the 22 moderate-small earthquakes in Yangjiang area. The descent trend of corner frequency of S wave is showed by the changes of the time before the earthquake (M_S4.9), the azimuth of axes P of Yangjiang sequence show that the stress has begun to be identical in four months before this event.
Keywords:Source parameter  Focal mechanism  Yangjiang earthquake (M_S4  9)  Corner frequency
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