张北6.2级地震地裂缝特征及其研究意义

THE FEATURE AND RESEARCHING SIGNIFICANCE OF THE GROUND FISSURES FORMED BY ZHANGBEI 6.2 EARTHQUAKE

摘要: 张北6.2级地震现场调查结果表明,这次地震形成了大量的非构造地裂缝,它们主要分布在极震区和Ⅶ度区。地裂缝的优势方位为NNE和NWW向,与Ⅷ度等震线双向展布基本一致。利用地裂缝的空间分布特征和统计的优势方位,探讨了地裂缝与烈度分区和发震构造的关系。

Abstract: The investigation on the site of Zhangbei earthquake shows that this event formed a lot of ground fissures,which distribute mainly in the zone of Ⅷ intensity and Ⅶ intensity.The preponderant directions of the fissures are NNE and NWW,which is consistent with the two-direction distribution of isoseisms.Based on the spatial distribution feature of the fissures and the statistical preponderant directions,the relation of ground fissure with intensity zoning and seismic structure is discussed.