摘要
根据广东数字地震台网记录的区域性地震记录,利用遗传算法采用由"三段几何衰减模型"拟合得到的广东地区的衰减模型,得到广东地区Q值与频率的关系(Q(f)=454 8f0 37),由此衰减模型反演得到各台站的场地响应,最终得到72个中小地震的震源参数;并研究了广东地区震源参数的特征及其相似关系。这些地震的地震矩在1012N·m与1014N·m之间,求出与地方震震级之间的相似关系;该地区中小地震的应力降在0 02到3 2MPa之间,未显示与地震的规模(地震矩)有明显的依赖关系。
Based on the regional data recorded by Guangdong Digtal Seismograph Network, we obtain the frequency-dependent Q(Q(f)=454.8f^(0.37)) in Guangdong region using a genetic algorithm and the attenuation function gained by the fitting of a trilinear geometrical spreading model. And then, the site responses are determined by the inversion of the model in every station. Finally, 72 source parameters are gained. The seismic moments are from 1012 N·m to1014 N·m. It connects with the local magnitude and does not clearly relate with stress drops of mid-small earthquakes that the range is from 0.02 MPa to 3.2 MPa in this area.
出处
《华南地震》
2004年第2期11-21,共11页
South China Journal of Seismology
基金
中国地震局<地震图像与数字化观测资料应用实验室>
广东省防震减灾重点课题资助.
关键词
震源参数
区域性地震记录
广东地区
source parameter
regional seismic record
Guangdong region
