西北地区地震综合前兆信息量S值的应用研究  

Application study on the earthquake synthetical information variable S-value in northwest region

作　　者：马玉虎[1] 王培玲[1] 李永强[1] 

机构地区：[1]青海省地震局,青海西宁810001

出　　处：《地震》2007年第1期95-104,共10页Earthquake

基　　金："十五"科技攻关项目(2004BA601B01-01-04);地震联合青年基金(605028)

摘　　要：一个地震前兆观测异常所提供的地震信息一般由异常地点、异常变化量、异常持续时间以及异常完成后的延续有效时间等诸多因素所决定,因此提出了用于描述地震异常的前兆信息量S值。根据地震前兆异常信息量综合数学表达式为基础,充分结合平滑滤波、消周期及趋势项和从属函数等数据处理方法,对西北地区67个观测资料较为连续的前兆主要台项进行地震综合信息量S值的计算与提取。结果表明,S值综合信息量时序曲线在西北地区1986年5月至2005年3月间的10次MS≥5.0地震震前均出现不同程度的高值异常(S≥0.154)。Earthquake precursor observation provided the earthquake information generally including the locality of anomaly, the variable of anomaly, the duration of anomaly, the effective extension of time after anomaly completion, therefore, the earthquake synthetical information variable S-value is proposed to describe the earthquake anomaly. Taking synthetical mathematic expression of the earthquake anomaly information as base, the smooth filter, disappearing cycle, tendency item as well as the data processing method, such as the subordinate function method, are used to compute and extract the value S from 67 sets of observational data in Northwest China region. The results show that the S value synthetical information during the period of May 1986 to March 2005, 10 earthquakes with Ms≥5.0 in the Northwest China region appears very high anomaly （S=0. 154）.

关 键 词：从属函数 S值 前兆异常 西北地区 

分 类 号：P315.72[天文地球—地震学]