【摘要】 利用区域地震台微震仪的的资料,测得海城地震部分前震和余震的区域剪切应力值τ_o 和介质品质因数 Q。结果表明,海城地震是在低应力背景下发生的,没有显示出主震前后τ_o 值有明显的变化。本区 Q 值为250,而本溪震群及和顺震群处 Q 值则约为100。并讨论了微震仪脉冲响应的近似计算,以及震级标度对测定结果的影响。更多还原

【Abstract】 On rhe basis of the data obtained through the microseismographs installed at the regional seismic stations, the regional shear stress valtts τo and the quality factor Q of the media of parts of the forcshocks and aftershocks during the Haieheng earthquake are determined. The achieved result shows the Haicheng earthquake had occurred with a background of low stress and the τo value didn’t manifest obvious changes both before and after the occurrence of the main shock. The Q value of this region was 250, whereas that of the Bcnxi and Heshun swarm regions was approximately 100. Finally, a discussion is held on the approximate calculation of the microseismograph’s pulse response and the influence of magnitude determination upon the determination result.更多还原