苍山5.2级地震的地形变特征及机制

FEATURE AND MECHANISM OF CRUSTAL DEFORMATION OF THE CANGSHAN EARTHQUAKE WITH M_s=5. 2

运用新方法对苍山地震前后的形变资料进行了异常识别，重点分析形变异常的变化特征及机制。结果显示：①苍山地震是大面积应力积累、调整的结果；②以外围区100～200km中短及短期异常为主，而震中100km内的近源区异常并不显著；③进入短期的异常标志是中短期异常出现转折或反向。

Using new methods, the authors recognized the anomalies of de formation data around Cangshan earthquake. The feature and mechanism of deformation anomalies are mainly analyzed. The result shows that: 1. Cangshan earthquake is the result of stress accumulation and adjustment in a large area; 2. The medium-and short-term or short-term anomalies mainly appeared in the periphery of 100~200 km from the epicenter, but the anomalies near the source area (<100 km) are not significant; 3. The sign implying the short-term anomaly is the turning or reversing of the medium-and short-term anomalies.