乌鲁木齐10号泉水汞短临前兆特征探讨

从１０号泉地下水汞的地球化学特性入手，结合近５年来１０次震例，分析并初步总结了地下水水泵的短临前兆特征，水泵的短临异常的出现往往是突发性的；汞异常形态特征基本上具有一定重复性的正异常，仅有个别地震时出现负异常。映震范围；对５级以下地震，水汞异常范围约在６００ｋｍ以内，对５级地上地震，水汞异常范围约在３５０ｋｍ以内；对个别７级以上地震可能映震范围接近１０００ｋｍ。汞异常时间与发震；在前兆近场，往往在

DISCUSSION ON THE CHARACTERISTICS OF SHORT TERM, IMPENDING EARTHQUAKE ANOMALY OF THE NUMBER 10 SPRING IN URUMQI

To begin with the geochemical character of ground water mercury ,the short term,impending earthquake precursory characteristics of groundwater in the number 10 spring are analyzed and sumed up combined with ten earthquake examples in recent five years. It is found that groundwater mercury precursors have following characteristics:(1) Generally,the short term,impending earthquake anomaly of groundwater mercury happens suddenly.(2) Except isolated cases,the anomalous form always keeps positive anomaly with certain repeat.(3) For M>5 earthquakes,the area of water mercury anomaly reflecting earthquakes is less than 600 km;for M<5 earthquake,the area of anomaly reflecting earthquakes is less than 350 km;for one or two M>7 earthguakes,the area of anomaly reflecting earthquakes can near 1000 km;(4) Near field earthquakes usually occur in several days or tens of days after water mercury curve suddenly jumps ,but far field earthquakes usually occur in several hours or several days after the water mercury curve suddenly jumps.In the end of the paper,the genesis of water mercury anomaly is discussed preliminarily.