珠三角地区地震前兆场特征及近期地震危险性分析

THE CHARACTERISTICS OF SEISMIC PRECURSOR FIELD IN THE PEARL RIVER DELTA AREA AND THE HAZARD ANALYSIS IN THE NEAR FUTURE

应用时空域层次分析新思路及我国地震科技攻关成果对珠江三角洲地区的地震前兆资料进行了数据处理和综合分析 ,对该区的地震前兆场特征作了较全面系统的研究 ,并对目前存在的区域前兆异常场进行特征分析。研究认为 ,区内现有的前兆监测方法在中强地震发生前呈现出与正常动态变化相异的中期或中短期前兆异常反映 ,并具有相对丛集的总体特征。前兆异常场由东莞虎门重力、广州水化学等构成。

Based on the using new thought of spatial-temporal levels analysis and recent research results,the monitoring data of seismic precursor in the Pearl River Delta area were professional processed and synthetical analyzed,and the characteristic of seismic precursor field and that of abnormal precursor field in the area at present day were analyzed systematically.The studies are that the existent precursor's monitoring method can show medium and short-term anomaly which differs from natural dynamic variousness before earthquake,and seismic precursor anomalies has collectivity characheristic of convergence and cluster relatively. Presently, precursor anomaly field of the area is formed by gravity anomaly on Dongguan and hydrogeo chemistry anomaly on Guangzhou etc.Lastly,the analysis of seismic hazard in Pearl River Delta area in the near future was also given.