Intensity Distribution of the Mojiang M_S5.9 Earthquake in Yunnan in 2018

The distribution of the intensity of the Mojiang M_S5.9 earthquake in Yunnan Province is expounded, and the damage characteristics of buildings and the damage ratio and seismic damage index of various building structures in each intensity area are compared with those of The Chinese Seismic Intensity Scale. The main basis and method of seismic intensity assessment are discussed in this paper. It is concluded that: ① The seismic intensity should be based on the earthquake damage of the housing structure, which takes up a high ratio in the seismic intensity assessment. It is recommended that seismic intensity is estimated by calculating the average seismic damage index. ② The highest intensity of the Mojiang M_S5.9 earthquake is Ⅷ degrees, with the long axis trending in the north-west direction. The area above Ⅶ degrees is 5,180 km^2. ③ The intensity distribution of the Mojiang M_S5.9 earthquake meets the national standard and the distribution law of seismic intensity in Yunnan.

2022年“9·5”四川泸定M_(S)6.8地震同震地质灾害发育特征与人居环境适宜性评价——以得妥镇为例

以2022年9月5日四川泸定M_(S)6.8地震的重灾区得妥镇为例,分析其同震地质灾害的发育特征,以地貌、坡度、地层岩性、断裂构造、地表水系、地质灾害危险区和地震烈度7个因子构建了研究区人居环境适宜性评价体系并开展了评价,结果表明:①震后地质灾害在空间上的分布特征表现为滑坡和崩塌沿断裂带和河岸两侧最为发育,也多见于盘山公路等交通工程周边,沟谷易演变为泥石流沟;②人居环境不适宜区和较不适宜区分别占评价区面积的3.18%和5.42%,这些区域主要集中在大渡河两岸及断裂构造活跃区;③研究区内大部分仍为较适宜区,占评价区面积的85.57%,在各村均有分布;④人居环境适宜区仅占比5.84%,而常住人口大多并未在此区域。建议加强地质灾害诱发机理基础研究、增强震前地质灾害早期识别与预测、前置地质灾害防治措施、优化震后应急抢险救灾管理和结合国家与地区政策科学规划灾后重建,建立从基础研究、灾前早期识别与预测、灾时应急抢险救灾到灾后重建的全过程防灾减灾体系。

菏泽5.9级地震前后水准测量与承压水变化关系的研究

利用深层承压水头观测结果,对东明——菏泽长水准测线8——9号测段的高差变化进行了回归计算和相关分析。认为菏泽市城区9号测点下沉的主要原因是受深层承压水头变化的影响。排除地下水影响因素后证实,1983年11月7日菏泽5.9级地震前后仅3mm左右的升降变化,表明9号测点对这次中强地震仅能反映微弱的形变信息量。

石棉县某崩塌体稳定性分析与治理方案研究

四川省泸定县MS6.8级地震引发大量地质灾害。石棉县王岗乡挖角村后坡由地震引发花岗岩强风化层剥落、滑塌,造成岩土体裸露,并进一步演化形成危岩体6处。经计算,大部分危岩体在天然状态下处于基本稳定状态,在暴雨工况下处于欠稳定状态,在地震工况下处于欠稳定-不稳定状态。“9·5”泸定地震震后应急抢险工程中已在斜坡坡脚修建3段拦石墙。本次在有效治理灾害的基础上,兼顾生态修复问题。针对1^(#)危岩带斜坡采取“削坡+格构+植生袋绿化”的治理方式;对危岩带坡脚堆积体采用草藤搭配治理方法;对挡土墙采用藤本植物爬墙绿化方案。