摘要
利用遗传算法反演山西中南部地区14个地震震源谱的低频水平、拐角频率和7个台站的场地响应。结果表明,Q(f)与频率的关系是:Q(f)=299.4f0.563;7个基岩台中岢岚、东山、阳城台在3 Hz^6 Hz附近有6~8倍的放大、离石台在2 Hz^10 Hz有2~3倍的放大。标量地震矩M。与ML震级线性相关较好,震源半径在230 m^508 m之间;拐角频率和地震矩之间的关系表现为拐角频率随地震矩的减小而增大;应力降和地震矩之间存在着应力降随地震矩的增大而增大的关系。
Low-frequency spectrum levels, corner frequencies of 14 seismological stations, located in the central and southern regions of Shanxi, and site responses of 7 stations among them have been inversed by using genetic algorithms. The result shows that the relation between frequency and Q（f） is Q（f）= 299.4f^0.563. Among 7 bedrock stations, low-frequency spectrum level of Kelan, Dongshan and Yangcheng stations are magnified 6-8 times around 3-6 Hz and Lishi Station, 2-3 times around 2-10 Hz. Scalar seismic moment Mois well linearly correlated with magnitude ML. The source radius is in 230-508 m. Corner frequency increases with the decrease of seismic moment and stress drop increases with the increase of seismic moment.
出处
《山西地震》
2007年第4期1-6,15,共7页
Earthquake Research in Shanxi
基金
山西省地震局科研项目(SBK-0605)
关键词
震源参数
地震波形
场地响应
联合反演
Source parameter
Seismic wave form
Site response
Combined inversion
