【摘要】 宁夏海原大地震极震区所存在的南北两侧地震烈度衰减异常及伴随的震害程度差异现象,严格受极震区内黄土微地形地貌、土层厚度、显微结构、工程地质特性和发震构造断裂的控制。上述诸因素与地震波耦合后,达到进一步激化和放大地震能量的效应,导致研究区内黄土强度瞬间丧失,并因之具更高的地震易损性而加重震害。更多还原

【Abstract】 This article studied abnormaly of both earthquake intensity attenuation and hazard degree along two sides of isoseismal line in Haiyuan. Those special phenomena were controlled by loesss micro terrain landforms, microstructure, thickness of loess stratum, structure and project geology property. All of above factors result in sharpening and enlarging earthquake waves, which made the loess lose its strength in an instant and caused more damage than other area.更多还原