乌鲁木齐10号泉水汞短临前兆特征探讨

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

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汞的短临前兆特征：水汞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是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 级以上地震，水汞异常范围约在３５０ ｋｍ 以内；对个别７ 级以上地震可能映震范围接近１ ０００ ｋｍ 。汞异常时间与发震：在前兆近场，往往在异常突跳后数天至数十天发震；在前兆远场，往往在异常突跳后数小时至数天发震。最后对水汞异常成因进行了初步探讨。

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.