大灰厂跨断层形变资料的地震信息识别

IDENTIFICATION OF POSSIBLE SEISMIC MESSAGE IN LEVELLING DATA ACROSS FAULT AT THE DAHUICHANG STATION

利用具有明显物理意义的断层蠕动模型在充分考虑可能存在的干扰因素影响的基础上,对大灰厂台跨断层地形变资料在1989年大同地震前后出现的较大幅度变化进行了异常属性分析。结果表明,这个时期的异常变化尽管叠加有一定的降雨影响,但蠕动模型计算得出的地表变化理论值与实际变化有一定程度的符合,显示出在区域应力场作用下,八宝山断层局部地段在大同地震前后可能存在着与区域应力场应力增强及应力调整有关的构造活动。

Taking the possible interference factors into consideration, the authors discussed the possible mechanism of the anomalous changes in the levelling data across the Babaoshan fault before and after the Datong-Yanggao earthquake in 1989 by means of the fault creep model. The result shows that the real change approximately corresponds to the theoretical one deduced from the model before and after the event although the rainfall effect exited. This fact reveals that the tectonic activity may exit along the local segment of the Babaoshan fault before and after the Datong-Yanggao earthquake due to the regional stress increase and adjustment.