台湾花莲西南Ms7．6级地震对庐江台汤池1^#井地下流体的影响

The Influence of Taiwan Ms7.6 Earthquake in the South-west of Hualian upon the Subsurface Flow of Tangchi 1# Well at Lujiang Station

介绍庐江综合观测井在1999年9月21日台湾花莲西南Ms7.6级地震的前兆异常及震时、震后效应。该井在这次地震的前兆异常的主要特点是:⑴溶解气体组分、水氡、井压等存在中期异常,异常时间都在3～4年;⑵水位和水温存在短临异常;⑶大部分测项震后效应明显;⑷水位和水温的震时和震后效应几乎同时出现,但却是逆向发展,为多年以来地下流体综合观测资料中所少见。

This article introduces the forewarning abnormity and during and after-shock effects of Lujiang observation well in the Ms7.6 earthquake happened on September 21, 1999 in the south-west of Hualian in Taiwan. The main features of the forewarning abnormity of the earthquake are： （1） abnormity in the components of the solution gas, anomalous radon content in water and the well pressure anomaly, the anomaly period is about three to four years;（2） short term abnormity concerning the water level and the water temperature; （3） most of the observation objects show obvious after-shock effects; （4） during and after-shock effects of the water level and the water temperature appear almost at the same time, but develop towards opposite directions, which is seldom seen in the subsurface flow observation data.