摘要
选取了1966年以来云南地区22个MS≥6.0震例的地震影响场和余震序列,对两者的关联度进行空间统计分析。将余震分级后按2小时递增进行时段划分,然后用一元线性回归方法对各组余震数据进行线性模型回归。采用自变量极值法控制回归直线的范围,将得到的回归线段中点判定为宏观震中,线段方向判定为影响场方向。结果表明:此方法判定的结果总体上比较接近各震例的宏观震中和影响场方向。
Collecting the isoseismal map and aftershocks of 22 earthquake events （Ms≥6.0） occurred in Yunnan since 1966, we studied a method for the rapid assessment of the macro-epicenter and earthquake-effected field. First- ly, we classified the aftershocks by magnitude and time into different groups, then we calculated the data of ev- ery group by simple linear regression. Controlling the length of regressive line through Variable Extreme Value method, we regarded the middle point of the regressive line as the macro-epicenter, and the line＇s direction as the isoseisma＇s direction. The results are generally in line with the data Izot by the field survey.
出处
《地震研究》
CSCD
北大核心
2011年第4期525-532,共8页
Journal of Seismological Research
基金
地震应急青年课题(ECA-EDEM-201013)行业专项:西南地震应急对策新模式与关键技术研究(201108013)
国家科技支撑计划:中国西部高原地区强震山体滑坡次生地质灾害及灾害链风险评估模型研究(2008BAK50B03-04-01)联合资助
关键词
余震
宏观震中
影响场方向
一元线性回归模型
aftershocks
macro-epicenter
Isoseisma direction
simple linear regression
