青海玛多7.4级地震极震区震灾调查及分析

李鑫; 姚生海; 殷翔; 绽蓓蕾; 盖海龙; 李延峰

doi:10.11899/zzfy20210301

青海玛多7.4级地震极震区震灾调查及分析

doi: 10.11899/zzfy20210301

李鑫^{1, 2,},
姚生海^{1, 2},
殷翔^{1, 2},
绽蓓蕾^{1, 2},
盖海龙^{1, 2},
李延峰^{1, 2, ,}

1.
青海省地震局，西宁 810001
2.
青海格尔木青藏高原内部地球动力学野外科学观测站，青海格尔木 816000

基金项目: 玛多地震科考专项经费

详细信息

作者简介:
李鑫，男，生于1995年。硕士，助理工程师。主要从事构造地质及灾后损失评估等方面的研究。E-mail：240334326@qq.com

通讯作者:
李延峰，男，生于1981年。学士，高级工程师。主要从事地震监测与预警等方面的研究。E-mail：453680115@qq.com

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出版历程
- 收稿日期: 2021-06-07
- 刊出日期: 2021-09-30

Investigation and Analysis of Earthquake Disaster in the Extreme Earthquake Area of M_S7.4 Earthquake in Qinghai Province

Li Xin^{1, 2
,},
Yao Shenghai^{1, 2},
Yin Xiang^{1, 2},
Zhan Beilei^{1, 2},
Gai Hailong^{1, 2},
Li Yanfeng^{1, 2
, ,}

1.
Earthquake Administration of Qinghai Province, Xining 810001, China
2.
Field Scientific Observation Station for Geodynamics of the Interior of the Qinghai-Tibet Plateau, Golmud 816000, Qinghai, China

摘要

摘要: 2021年5月22日2时4分，青海省玛多县发生7.4级地震，距震中26 km的野马滩大桥及周边区域为此次地震极震区（地震烈度Ⅹ度，面积约69 km²），受损尤为严重。桥梁表现为落梁式破坏，房屋不同程度受损。对极震区内野马滩大桥及周边房屋进行实地调查与震灾分析，并提出灾后重建及震灾防御相关建议，包括组织专业人员进行灾区房屋安全鉴定，建议牧民居住建筑采用轻钢式结构，建议原地重建野马滩大桥并增加限位装置及连梁装置。
- 玛多地震 /
- 极震区 /
- 野马滩大桥 /
- 震灾分析
Abstract: At 02:04 on May 22, 2021, a magnitude 7.4 earthquake occurred in Maduo County, Qinghai Province. The Yematan Bridgeand its surroundings, 26 km away from the epicenter, are the extreme disaster area (the area of earthquake intensity 10 is about 69 km²). The damage type of this bridge was the falling-beam damage, and the local residential buildings were damaged to different levels. The field investigations and earthquake disaster analysis were carried out on the Yematan Bridge and surrounding houses in the extreme disaster zone, and relevant suggestion on post-earthquake reconstruction and earthquake disaster prevention were put forward: Conduct detailed house safety appraisal for the professional personnel of housing construction organization in disaster area; For grazing residential areas, it is suggested to use light steel structure houses; For the Yematan Bridge, it is recommended to rebuild in situ, and increase additional limiting and connecting beam device.
- Maduo earthquake /
- Extreme disaster area /
- Yematan bridge /
- Earthquake disaster analysis

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图 1 青海玛多7.4级地震极震区范围示意

Figure 1. Schematic diagram of the investigation scope of the extreme area in Maduo county, Qinghai province

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图 2 青海玛多7.4级地震烈度图

Figure 2. Map of seismic intensity for M_S7.4 earthquake in Qinghai province

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图 3 野马滩大桥连续多跨落梁

Figure 3. Continuous multi-span falling beam of Yematan bridge

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图 4 野马滩大桥桥墩不同程度破坏

Figure 4. Different degrees of damage to the piers of the Yematan bridge

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图 5 野马滩大桥桥面开裂

Figure 5. Cracking on the deck of the Yematan bridge

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图 6 极震区不同结构类型房屋受损情况

Figure 6. Investigation on damage of different structural houses in the extreme areas

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图 7 野马滩大桥东侧近东西向地裂缝

Figure 7. Near the east-west ground fissure on the east side of Yematan bridge

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图 8 野马滩大桥两侧砂土液化

Figure 8. Liquefaction of sand on both sides of Yematan bridge

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图 9 野马滩大桥与断层位置示意图

Figure 9. Schematic diagram of the Yematan bridge and fault location

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表 1 极震区不同结构类型房屋震灾调查结果

Table 1. Investigation on earthquake disaster of buildings with different structures in the extreme areas

调查点	砖木结构房屋			土木结构房屋			轻钢结构房屋
调查点	数量/间	面积/m²	破坏情况	数量/间	面积/m²	破坏情况	数量/间	面积/m²	破坏情况
1	1	80	毁坏	1	30	严重破坏	—	—	—
2	1	100	毁坏	—	—	—	1	28	中等破坏
3	1	120	毁坏	—	—	—	1	15	基本完好
4	1	80	毁坏	—	—	—	2	40	基本完好

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