摘要
采用MSDP地震分析软件提供的Loc3D和HYPOSAT两种定位方法对芦山科考的8次人工爆破事件进行绝对定位,将定位结果与已知爆破参数进行对比分析。结果显示:两种方法和两种速度模型都能较为准确地测定爆破事件的震中位置,震中定位精度均可优于2.5 km;根据爆破点位置、炸药当量估算震级和定位震级的对比,可验证四川盆地属于介质低衰减区,川西高原属于介质高衰减区,两个区域地震震级平均偏差为0.3;震源深度误差受最近台站震中距的影响比较大,当最近台站震中距小于10 km时,两种定位方法反演的震源深度误差均可优于3 km。
Two positioning methods of MSDP(a seismic analysis software)by Loc3 D and HYPOSAT are used for forth research of 8 times blasting for absolute positioning.The positioning results are compared with the known blasting parameters.The analysis results shows that the two methods and two kinds of velocity model can more accurately determine the position at the epicenter of the blasting events.The epicenter location accuracy can be better than 2.5 km;The comparison between the the location magnitude and the estimated magnitude based on the shot point and the explosive equivalent can verify that the sichuan basin belongs to the low attenuation area of medium and the western sichuan plateau belongs to the high attenuation area of medium.The average deviation of the earthquake magnitude in the two regions is about 0.3.The focal depth error is greatly affected by the epicenter distance of the nearest seismic station.When the epicenter distance of the nearest station is less than 10 km,the focal depth error inversion by the two positioning methods is better than 3 km.
作者
魏娅玲
蔡一川
唐涛
WEI Ya Ning;CAI Yi Chuan;TANG Tao(Sichuan Earthquake Agency,Sichuan Chengdu 610041,China)
出处
《四川地震》
2019年第1期1-4,共4页
Earthquake Research in Sichuan
基金
中国地震局测震台网青年骨干培养专项(CEA-JC/QNCZ-18241)
监测
预测
科研三结合课题(CEA-JC/3JH-162306)联合资助
关键词
震中偏差
最大空隙角
震源深度
地震定位精度
deviation of epicenter
maximum clearance angle
focal depth
seismic location accuracy
作者简介
魏娅玲(1979-),女,四川省泸定县人,高级工程师,从事大震速报工作.E-mail:sctws@163.com;通讯作者:蔡一川(1979-),男,高级工程师,从事系统维护工作.E-mail:67279224@qq.com。
