【摘要】 利用浙江省区域数字地震台网记录的皎口水库地震波资料,采用Brune（1970）模式,通过几何扩散校正、介质衰减校正、仪器校正等,将速度记录谱归算为震源位移谱,使用遗传算法计算拐角频率及零频极限,进而计算震源半径、地震矩等小震震源参数,系统分析各种参数之间的关系。分析2009年9月—2010年1月间M_L 1.0—3.3皎口水库库区28次地震,结果为:地震矩范围为10¹¹—10¹³N·m,震源破裂半径为110—319 m,地震矩、拐角频率、矩震级及体波震级之间表现出一定的对数线性或半对数线性关系,并可分别表示为:1gM=0.01177R+10.2,1gM=1.009M_L+10.5,M_W=0.667M_L+0.98534。地震应力降范围为0.02—2.05 MPa,应力降与震源半径之间表现出一定的相关关系。更多还原

【Abstract】 Using Brune model（1970）and the seismic data of Jiaokou reservoir recorded by the regional digital seismic station of Zhejiang Province,we transferred the velocity record spectrum into hypocenter displacement spectrum by geometry diffusion correction,dielectric attenuation correction and instrumental correction.The corner frequency and zero frequency were calculated using genetic algorithm.Then hypocentral parameters including hypocentral radius and seismic moment were calculated and the relationships between them were analyzed systematically.28 regional earthquakes of M_L 1.0—3.3,occurred between 2009-09 and 2010-01 were used in this study.The results show that the seismic moments of these earthquakes are 10¹¹—10¹³N·m and rupture radius are 110—319 m.There are log-linear relationships between seismic moments and corner frequency,seismic moment and body-wave magnitude and semi-log-linear relationships between moment magnitude and body-wave magnitude. They can be expressed:1gM=0.01177R + 10.2,lgM=1.009M_L + 10.5,M_W= 0.667M_L +0.98534.The seismic stress drops ranges from 0.02—2.05 MPa and some correlation shows between stress drop and hypocenter radius.更多还原