中强地震前朝阳地震台地倾斜异常特征分析

辽宁省朝阳地震台地倾斜长期可靠的资料，在多次中强地震前出现明显的中短期异常，为预报地震提供了重要依据。本文研究讨论了距朝阳台600km范围内发生的10次地震（4．5≤M≤6．2）前兆异常特征，结果表明：朝阳台倾斜异常的时间、形态、方向与所处的构造位置有关。异常持续时间与震中距呈现明显的线性关系，异常形态与地震的空间位置有关，短期异常是判定地震发生时间的重要指标。在此基础上判断朝阳地倾斜目前所处的异常阶段，分析预测了未来地震发生的区域和强度。

ANALYSIS ON THE ANOMALOUS CHARACTERS OF GROUND TILT BEFORE MODERATE-STRONG EARTHQUAKE AT THE CHAOYANG SEISMIC STATION

The moderate-short term anomalies before the moderate-strong earthquakes were finded by a long-term and reliable data of the ground tilt at Chaoyang seismic station in Liaoning province, it was an impotant basis for the earthquake prediction. The precursory anomalous characteristics of 10 earthquakes （4.2≤M≤6.2） which were within 600 km of the Chaoyang station were analyzed in this paper. The results showed that the time, form, derection related to the structural position, the anomalous continuous time and epicentral distance appeared linear dependence, the anomalous form related to the spacil position of the earthquake, the sort term anomalies were an important target for judging the seismogenic time. On the basis of analyzing anomalous stage of Chaoyang station at presant, the area and magnitude of earthquake in the future was predicted.