河北易县台形变异常映震能力分析

Earthquake Reflection at the Yixian Seismic Station, Hebei Province Based on Deformation Anomalies

摘要:

对河北易县台形变观测资料日均值和月均值在2次唐山地震前后的变化进行分析,发现该台多种观测手段在地震前记录到了显著异常,分析其共性和差异性,给出该台形变资料的异常特征和提取方法。

Abstract:

Anomalies in the daily and monthly mean value curve of crustal deformation anomalies before the Tangshan M4.2 and M4.8 earthquakes in 2010 and 2012 were analyzed.This study examined the earthquake reflecting ability at the Yixian seismic station.Stress and strain sensitive points were identified around the focal region of the formation and evolution of the source.A relevant earthquake anomaly may have existed if several set of instruments or different components in the same observation all showed anomalies.The reliability of a group of anomalies was better than a single anomaly.The shape of anomalies may have differed in the same observation before different earthquakes.This difference must be detected in order to reasonably identify anomalies.Similarity among anomalies in the short and imminent stage dominates earthquake preparation.