【摘要】 本文使用山东地区中小地震的地震数字波形资料,基于Brune圆盘模型得到了2001年1月至2011年7月206个ML≥2.0地震的辐射能量、地震矩、视应力等震源动力学参数。震源参数标度关系分析结果显示,视应力呈现随地震矩增加而增加的趋势,但在视应力较低的2008年9月至2011年3月ML≤2.8震级段,视应力和地震矩之间没有趋势性关系。视应力时空变化特征分析结果表明,山东地区2004年至2007年应力水平明显升高,视应力高值主要集中于安丘—昌邑、莒县—郯城、聊城—兰考断裂、胶东半岛等地区,2009年后处于应力较低水平,但2011年3月开始有升高现象,值得继续关注。更多还原

【Abstract】 In this paper,by using the waveform data of medium and small earthquakes in Shandong province,we calculated the earthquake energy,seismic moment and apparent stress of 206 ML≥2.0earthquakes from January 2001 to July 2011 based on Brune model.The scaling relations of source parameters turns out that apparent stress increase with the seismic moment,except the earthquakes with ML≤2.8from September 2008 to March2011during which time the apparent stress was low.The temporal and spatial variation of apparent stress shows that the stress level in Shandong province obviously increased from2004 to 2007,and the high value concentrated in Anqu—Changyi,Juxian—Tancheng,Liaocheng—Lankao,and jiaodong peninsula,the stress remained low after 2009 and began to rise from March 2011,which deserves continous concern.更多还原