2003年10月25日民乐-山丹6.1、5.8级地震烈度和发震构造特征

CHARACTERISTICS INTENSITY AND SEISMOGENIC STRUCTURE OF MINLE-SHANDAN MS6.1 & MS5.8 EARTHQUAKES ON OCT.25, 2003

摘要:

2003年10月25日20时41分在甘肃省民乐县和山丹县境内发生了6.1、5.8级地震。现场考察宏观震中位于民乐县永固镇姚寨子村和山丹县霍城镇刘庄村一带;极震区烈度为Ⅷ度;发震断层为民乐-永昌隐伏断裂和童子坝河隐伏断裂。本文分析了震区房屋建筑特征和抗震性能及烈度分区特征,探讨了地表变形分布与发震构造的关系。

Abstract:

M_S6.1 & M_S 5.8 Earthquakes occurred in Minle county and Shandan county, Gansu province on Oct.25, 2003. According to the field investigation, the macro-epicenter lie on the area from Yaozhaizi village of Yonggu town, Minle country to Liuzhuang village of Huocheng town, Shandan country, and the intensity of extreme seismic zone is Ⅷ. The seismogenic faults are Minle-Yongchang buried fault and Tongzihe buried fault. In the paper,the characters of local houses and structures as well as their earthquake resistance quality, and distribution of the intensities are analyzed. The relationship between ground deformations and seismogenic faults is discussed.