基于遗传算法，采用Atkinson方法，选取2009-2017年内蒙古数字地震台网记录的内蒙古西部地区ML ≥ 2.7地震事件波形资料，反演得到83个地震的震源参数。分析结果表明：该地区的拐角频率、地震矩、零频振幅与震级之间的相关性较好，而地震矩与应力降以及应力降与震级之间呈弱相关性，地震矩与拐角频率呈良好负相关性。其中，应力降集中分布在0.7-20 MPa，当ML > 3.6时，随着震级增大，应力降呈现较为离散的特征。
Method based on genetic algorithm, using the Atkinson, selecting the waveform data of the ML ≥ 2.7 earthquake in the western Inner Mongolia recorded by the Inner Mongolia Digital Seismic Network from 2009 to 2017. The source parameters of 83 earthquakes were calculated. The analysis results show that there is a good linear relationship between the corner frequency, seismic moment, zero-frequency amplitude and the magnitude of the region. The seismic moment and stress drop and the stress drop and the magnitude show a weak correlation. The seismic moment and the corner frequency are good negative correlation. Among them, the stress drop is concentrated in 0.7-20 MPa. When ML > 3.6, the stress drop exhibits a discrete feature as the magnitude increases.
2018,39(5): 15-22 收稿日期：2017-09-04
DOI：10.3969/j.issn.1003-3246.2018.05.003
基金项目：2017年内蒙古自治区地震局局长基金（项目编号：2017JC06）
作者简介：苏亚梅(1973-),女,本科,工程师,主要从事地震监测预报工作。E-mail:757115546@qq.com
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