2014年文泰地震序列震源参数研究

Source Parameters Research of 2014 Wentai Earthquake Sequence in Zhejiang

以浙江省数字地震台网记录的文成-泰顺地震序列资料为基础,使用brune模型,以遗传算法计算了零频极限、拐角频率、震源半径、地震矩等震源参数,并对各种参数之间的关系进行了分析。研究中使用的文成泰顺地区地震发生于2014年9月~2014年11月间,震级范围为M_L2.0~4.4级,地震数量165个。研究表明:2014年文泰地震序列的地震矩范围为10^(12)~10^(15) N·m,震源破裂半径范围为72~594 m,应力降范围为0.06~3.12 MPa,应力降与震源半径之间未表现出相关关系,地震矩、拐角频率及体波震级之间表现出对数或半对数线性关系。

Based on the Brune model （1970） and the seismic data of Wencheng-Taishun earthquake sequence recorded by the regional digital seismic network of Zhejiang, the paper calculated the corner frequency, zero frequency, source radius and seismic moment with genetic algorithm, and systematically analyzed the relationships between them. The paper studied 165 earthquakes with ML 2.0-4.4 from September to November in 2017. The result shows that the seismic moments are 101-1015 N .mand; rupture radius are 72-594 m; seismic stress drops range from 0.06 MPa to 3.12 MPa. No correlation wasfound between stress drop and hypocenter radius.log-linear and semi-log-linear relationships were found between seismic moment, corner frequency and body-wave magnitude.