粤闽交界中强地震前水化学异常特征分析

摘要

Through studying hydrochemical precursory data before earthquakes (ML 〉 4. 5) occurring in the border region of Guangdong and Fujian Provinces since 1990, we found that: (1) the characteristics of hydrochemical anomaly with short-term and imminent changes is complicated; (2) various different anomalies are synchronous for a station; (3) the duration and morphological characteristics of anomaly were related to epieentral distance. In addition, it is impossible to locate the epicenter of future earthquakes through the statistics of hydrochemical anomalies.%研究了粤闽交界90年以来ML≥4．5地震前水化学前兆资料，结果表明：（1）水化学前兆异常形态复杂多样，以短期和短临变化为主；（2）同一台站震前所观测的异常变化具有多测项同步异常的特征；（3）震前异常持续时间、异常形态与震中距有关。同时研究表明，统计水化学异常出现的集中程度无法判定未来震中位置。