【摘要】 汶川8.0级地震发生前3个月,陕西省泾阳地震台短水准出现向南的下滑异常,异常最大幅度2.2 mm。2001年2月23日四川雅江6.0级、1995年10月24日云南武定6.5级和1995年12月18日青海玛多6.2级地震期间也出现了同类异常现象。用反演方法求得地震震级与震中距、异常幅度等的关系式为M=0.002 8L+1.126 9H+0.076 8T。更多还原

【Abstract】 It was found that the abnormal changes of short leveling data at Jingyang station,Shanxi province appeared,which downslide southward in three months before Wenchuan M s 8.0 earthquake.The similar phenomena appeared before the October 24,1995 Wuding M s 6.5 earthquake,Yunnan,the December 18,1995 Maduo M s 6.2 earthquake,Qinghai and the February 23,2001,Yajiang M s 6.0 earthquake,Sichuan.The relation among magnitude(M),epicentral distance(L),anomaly amplitude(H) and anomaly duration(T) is M=0.002 8L+1.126 9H+0.076 8T by inversion method.更多还原