摘要
根据安徽数字测震台网记录的23个地震波形事件,首先采用Atkinson方法得到安徽地区的非弹性衰减特征,再用Moya方法得到24个台站的场地响应。在此基础上,扣除传播路径、场地响应和仪器响应的影响,利用遗传算法得到2009年以来安徽测震台网记录的42个ML≥2.0地震的震源参数,并对这些震源参数特征进行了系统的分析与研究。研究结果表明,安徽地区地震的地震矩与近震震级之间存在较好的线性关系,近震震级与矩震级存在一定的偏差,应力降与近震震级存在明显的正相关,震级越大,拐角频率越小,震源破裂半径越大。
According to 23 seismic wavefomls recorded by Anhui digital earthquake network , they got inelastic attenuation through Atkinson method and site response from 24 stations through Moya method. Removing effect of propagation path, site response and instrument response, they got 42 source parameters of earthquakes with ML ≥ 2.0 recorded by Anhui earthquake network since 2009 using genetic algorithms method and made a systematic analysis on characteristics of it. The results show that：there is a good linear relationship between earthquake moment and local magnitude in Anhui;there is a certain bias between the local magnitude and moment magnitude;there is a clear positive correlation between stress drop and local magnitude;the larger the magnitude is , the smaller the corner frequency is and the greater the radius of rupture is.
出处
《内陆地震》
2012年第3期257-262,共6页
Inland Earthquake
基金
地震科技星火计划(XH12024)
安徽省地震局重点科研基金(20110501)
大别山实验场资助
关键词
震源参数
非弹性衰减
场地响应
地震矩
应力降
Source parameters
Non-elasticity attenuation
Site response
Earthquake moment
Stress drop
