青海玛多MS7.4地震震害特点分析

2021年5月22日,青海省果洛藏族自治州玛多县发生M_S7.4地震。以青海省地震局玛多地震烈度调查为基础,着重分析6个重点地区的房屋震害及极震区桥梁道路的破坏情况。此次地震震级高、伤亡轻,仅造成震中附近个别土木结构、砖木结构房屋出现倒塌破坏,部分砖混及框架结构出现楼梯间及填充墙开裂的现象,多数房屋基本完好;调查中还发现野马滩一号、二号大桥以及昌马河大桥均出现不同程度的倒塌损毁,这也为烈度图的划分提供了数据支持;最后对此次地震产生的次生地质灾害进行统计分析,并对灾后重建和抗震设防提出意见及建议。

Characteristics of seismic disasters caused by the MaduoMS7.4 earthquake in Qinghai Province

On May 22, 2021, an M_S7.4 earthquake occurred in Maduo County, Guoluo Tibetan Autonomous Prefecture, Qinghai Province.Based on the intensity survey of Maduo earthquake, this paper focused on the damage of houses in six key areas and the destruction of bridges and roads in meizoseismal area.The earthquake was characterized by high magnitude and light casualties. Only a few civil structures and brick and wood structures near the epicenter collapsed; some brick-concrete and frame structures showed stairwells and infill walls cracking, and most houses were basically intact.Through investigation, we also found that the Yematan No.1 and No.2 Bridges and Changma River Bridge all experienced different degrees of collapse and damage, thus providing the data support for the division of intensity map.Meanwhile, a statistical analysis of secondary geological disasters caused by the M_S7.4 earthquake was carried out, and some comments and suggestions on post-disaster reconstruction and seismic fortification were also put forward.