Analysis on Damage to Buildings and Earthquake Damage Anomaly Area of Gansu Jishishan MS6.2 Earthquake (Qinghai Earthquake Area)
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摘要: 2023年12月18日23时59分，在甘肃省临夏回族自治州积石山县（35.7°N，102.79°E）发生6.2级地震，震源深度为10 km。此次地震造成震区大量房屋倒塌，151人遇难，979人受伤。甘肃积石山6.2级地震最大烈度评估为Ⅷ度（8度），Ⅷ度（8度）区面积331 km2，包含异常区面积15 km2（甘沟乡），本研究调查了青海震区不同烈度区的房屋震害及Ⅷ度（8度）区内3个异常地区。调查结果显示，Ⅷ度（8度）区土坯、土木房屋受损较为严重，砖混、框架结构破坏较轻。该区域内由于地形、建造等原因，导致甘沟乡破坏较为严重；金田村由于饱水原因导致黄土液化产生流滑，造成严重的人员伤亡；寨子山地区发育的大量裂缝需要进一步开展监测治理工作。根据以上震害分析，对未来灾后重建及后续震灾防御提出参考性建议。Abstract: The China Standard Time 2023 on December 18, 23:59, a MS6.2 earthquake occurred in JIshishan county (35.7 ° N, 102.79 ° E), Linxia Hui Autonomous Prefecture of Gansu province, with a focal depth of 10 km. The earthquake caused a large number of houses collapsed, killing 151 people were killed and 979 injured. The magnitude 6.2 earthquake in Jishishan, Gansu province had a maximum intensity of 8 °. The earthquake affected 88 townships (streets) in 9 counties (cities and districts) of 3 cities (states) in Gansu province, as well as Taizishan Natural Forest Reserve and Gai Xinping Forest Farm, and 30 townships in 4 counties (cities) of 2 cities (states) in Qinghai province. The area of degree VIII (8 degree) is 331 square kilometers, including 15 square kilometers of abnormal area (Gangou Township) . The investigation results show that the adobe and civil buildings in VIII degree (8 degree) Zone are seriously damaged, and the brick-concrete and frame structures are relatively weak. Because of the topography, construction and other reasons, the destruction of Gangou Township is more serious. In Jintian Uprising, the loess liquefaction caused by water saturation has led to slide, causing serious damage. A large number of fractures developed in Zhaizishan area need further monitoring and treatment. Based on the above analysis of earthquake damage, some suggestions on post-disaster reconstruction and disaster prevention are put forward.
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Key words:
- Jishishan earthquake /
- Qinghai earthquake area /
- Building damage /
- Abnormal area
1)1 https://www.mem.gov.cn/xw/yjglbgzdt/202312/t20231222_472849.shtml -
图 1 甘肃积石山MS 6.2地震烈度及野外调查点图
Figure 1. Ministry of emergency management intensity and field survey points of the MS 6.2 earthquake in Jishishan, Gansu province
图 2 Ⅷ度（8 度）区内不同类型房屋震害图
Figure 2. Seismic damage map of different types of houses in the VIII degree （8 degree） area
图 3 Ⅶ 度（7 度）区内不同类型房屋震害图
Figure 3. Seismic damage map of different types of houses in the VII degree （7 degree） area
图 4 Ⅵ度（6度）区内不同类型房屋震害图
Figure 4. Seismic damage map of different types of houses in the VI degree （6 degree） area
图 7 金田村泥流（流滑）区域及震害图
Figure 7. Mudflow （slippery） area and earthquake damage map in Jintian village
表 1 青海地区房屋受损情况
Table 1. List of damaged housing areas in Qinghai region
地区 居民住宅受损数量/间 非住宅用房受损面积/m2 倒塌 严重损坏 一般损坏 倒塌 严重损坏 一般损坏 民和县 10136 24742 77287 0 160169.52 74118 循化县 1082 4291 48104 0 44874.38 146991 化隆县 0 164 898 0 3900 1636 同仁市 0 0 242 0 0 3675 合计 11218 29197 126531 0 208943.9 226420 
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表 2 烈度异常区（甘沟乡）房屋受灾情况
Table 2. List of disaster affected houses in areas with abnormal intensity（Gangou township）
房屋类别 总数/间 基本完好 轻微破坏 中等破坏 严重破坏 数量/间 占比/% 数量/间 占比/% 数量/间 占比/% 数量/间 占比/% 土坯 100 15 15.00 25 25.00 25 25.00 35 35.00 土木 360 30 8.33 60 16.67 250 69.44 20 5.56 砖木 1370 150 10.95 720 52.55 480 35.04 20 1.46 砖混 1150 100 8.70 758 65.91 272 23.65 20 1.74 框架 28 8 28.57 10 35.71 5 17.86 5 17.86 合计 3008 300 9.97 1600 53.19 1027 34.14 81 2.69
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