安徽及邻区地震震源深度分布特征研究

Focal depth distribution of earthquake in Anhui and neighboring region

选择安徽及邻区观测精度相对较高的地震资料作为样本,统计分析不同空间范围内的震源深度分布特征,初步讨论了震源深度与地质构造,地壳结构的关系。结果表明:安徽及邻区平均震源深度10 km左右。中小地震震源深度在空间分布是不均匀的,大体上从西到东,从南到北逐渐增加,深度优势分布为5～15 km。其中霍山地区震源深度优势分布为5～10 km。总体上,安徽及邻区地震多发生在5～20 km地壳的中上部,为浅源地震。

In this paper, we choose the seismic data with relatively high precision in Anhui and neigh-boring region as the samples to carry out the statistical analysis on the focal depth distribution of earthquakes with different magnitude and spatial scales, and then preliminarily discuss about the relationship between the focal depth distribution characteristics, seismic tectonics and crustal structure. The result shows that the average of all earthquakes depth is 10 kin. From west to east, south to north, the depth of this region increase gradually, while the pre- dominant depth of Anhui region is 5-15 kin. The spatial distribution of the focal depth of the small and moderate earthquakes is inhomogeneous in Anhui and neighboring region. The predominant depth of Huoshan region is 5-10 kin. Overall,the focal depth of earthquakes in Anhui and neighboring region is shallow, ranges from 5 to 20 km in the middle and upper crust.