Response of the topography of Laixihe drainage to the structural deformation induced by MS6.0 Luxian earthquake and its indication
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摘要: 以12.5 m 数字高程模型数据为基础，采用数字地貌分析方法提取了濑溪河流域的高程剖面和面积-高程积分（HI）等地貌参数，分析了2021年9月16日四川盆地东南部泸县MS6.0地震震中附近区域地貌与构造活动的响应关系。结果显示：震中西侧的螺观山和梯子崖背斜在震中的南北两端存在明显的缩短量差异；HI条带状低值区的展布方向与流域内构造的方向一致，HI高值区位于华蓥山两条断裂夹持的谷地，但在震中附近存在WNW向的HI低值带。综合分析认为，泸县地震震中附近应存在一走向为WNW的隐伏构造，它不仅调节了螺观山和梯子崖背斜在震中南北两端的缩短量差异，也使得HI值受其影响呈低值特征，该结果与震源机制解结果、等震线长轴走向以及余震空间展布的优势方向相一致。Abstract: Based on 12.5 m DEM data, the elevation profile and hypsometric integral （HI） of Laixihe drainage are extracted by digital geomorphological analysis method, and the response relationship between geomorphology and tectonic activity in the areas near the epicenter of Luxian MS6.0 earthquake is analyzed. The results show that the Luoguanshan and Tiziya anticlines have obvious shortening differences between the north and south ends of the epicenter. The low HI value zone is consistent with the direction of the structure in the basin. The high HI value zone is located between the valleys clamped by the two faults of Huayingshan, but there is a low value zone in WNW direction near the epicenter. The comprehensive analysis shows that there should be a WNW-trending buried structure near the epicenter, which not only regulates the shortening difference between the north and south ends of the epicenter for the Luoguanshan and Tiziya anticlines, but also makes the HI value being a low value characteristic affected by it. The WNW direction of the buried structure is consistent with the results of the focal mechanism solution, major axis strike of isoseismal line, and the dominant predirection of spatial distribution of aftershocks.
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图 3 跨螺观山和古佛山的AA′条带地形剖面
Figure 3. The swath profile AA′ across Luoguanshan and Gufoshan anticline structure
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图 5 跨螺观山和梯子崖背斜的高程剖面线BB′ （a）和CC′ （b）
Figure 5. Height profiles BB′ （a） and CC′ （b） across Luoguanshan and Tiziya anticline structures
表 1 泸县MS6.0地震震中附近区域断层（引自四川省地质局，1980）
Table 1 Faults information of Luxian MS6.0 earthquake area （after Sichuan Geology Bureau，1980）
名称 构造部位 走向 倾向 倾角/° 长度/km 性质 薄刀岭断层 圣灯山背斜北翼 N60°E NW 30—42 18.0 压性逆断层 石马岭断层 梯子崖背斜北西翼 N40°E SE 28—43 5.6 压性逆断层 天洋坪断层 梯子崖背斜北西翼 N45°E NW 30—63 18.0 压性逆断层 燕子崖断层 螺观山背斜近核部 N60°E SE 26—57 10.0 压性逆断层 黄泥垭断层 梯子崖背斜核部北段 N40°E NW 30—70 25.0 压性逆断层 堆金湾断层 海潮背斜及古佛山背斜近核部 N40°E NW 50—75 22.4 压性逆断层 黄草沟断层 海潮背斜北西翼 NE SE 35 4.4 压性逆断层 双河场断层 古佛山背斜北西翼 N40°—50°E SE 30—40 12.0 压性逆断层 菜子沟断层 古佛山背斜南东翼 N70°E S 28—37 10.0 压性逆断层 
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