An earthquake of magnitude M5.7 occurred in Yamutu village, Songyuan City, Jilin Province, NE China (45°16′12″N/124°42′35″E) on May 28, 2018, with a focal depth of 13 km. The epicenter is located at the intersection of the Fuyu/Songyuan-Zhaodong Fault, Second Songhua River Fault and Fuyu North Fault which lies northwest of Tancheng-Lujiang Fault (Tan-Lu Fault). The earthquake-induced widespread liquefaction structures and ground surface fissures within 3 km from the epicenter, caused serious disasters to the local surroundings. The visible liquefied structures include sand volcanoes, liquefied sand mounds, sand dikes and sand sills. Sand volcanoes can be divided into sand volcano with a crater, sand volcano without a crater and water volcano (no sand). Other soft-sediment deformation structures (SSDS) induced by the earthquake include deformation lamination, load and flame structures, deformation folds, dish structures, convolute bedding and water-escape structures. The formation process of the sand volcanoes comprises three stages: (1) building up excess pore-fluid pressure in the liquefied layer, (2) cracking of the low-permeable overlying layer, and (3) mixture of sand-water venting out of the ground surface. During the upward movement, the liquefied sand is injected into the low-permeable layer to form sand veins, sand sills and various types of deformation structures. Vertical distribution of seismic liquefaction structure can be divided into four zones: the thoroughly liquefied zone, the lower liquefied zone with SSDS, the upper liquefied zone with SSDS, and the ground surface liquefied zone. The liquefaction occurred at a burial depth of 2–5 m, and the thickness of liquefied sand is 2 m. NE-SW (35°–215°) trending compressive stress is possibly the seismogenic trigger of the Songyuan M5.7 earthquake that caused the fault (Fuyu/Songyuan-Zhaodong Fault) to reactivate. The study of the Songyuan seismic liquefaction structures gives insight into the prediction of modern earthquakes and disaster-prone areas. Meanwhile it provides abundant basic material for studying earthquake-induced SSDS in both ancient and modern sediments. The research is obviously of great significance to reveal that the northern Tan-Lu Fault has entered a stage of active seismic activity since the twenty-first century.

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2018年5月28日吉林省松原市M5.7地震液化构造及研究意义

2018年5月28日，吉林省松原市雅木图村（北纬45°16′12″/东经124°42′35″）发生M5.7级地震，震源深度13公里. 震中位于郯庐断裂（郯庐断裂）西北部的扶余/松原一肇东断裂、第二松花江断裂和扶余北断裂的交汇处。震中3公里范围内地震引起的广泛液化构造和地表裂隙，给当地造成了严重的灾害。可见的液化结构包括沙火山、液化沙丘、沙堤和沙床。沙火山可分为有火山口的沙火山、无火山口的沙火山和水火山（无沙）。地震引起的其他软沉积物变形结构（SSDS）包括变形层理、荷载和火焰结构、变形褶皱、碟形结构、回旋层理和逃水结构。砂火山的形成过程包括三个阶段：（1）在液化层中建立超孔隙流体压力，（2）低渗透上覆层破裂，（3）砂水混合排出。地面。在向上运动过程中，液化砂被注入低渗透层，形成砂脉、砂床及各类变形构造。地震液化构造垂直分布可划分为四个区：完全液化区、下层液化带、上层液化带、和地表液化带。液化发生在埋深 2～5 m 处，液化砂层厚度为 2 m。NE-SW（35°～215°）趋向压应力可能是松原M5.7地震的发震触发，导致断层（扶余/松原-肇东断裂）重新活动。松原地震液化构造的研究为现代地震和灾害多发区的预测提供了深刻的见解。同时为研究古今沉积物中地震诱发的SSDS提供了丰富的基础材料。该研究对于揭示郯庐断裂带北部自21世纪以来进入地震活动活跃阶段具有重要意义。NE-SW（35°～215°）趋向压应力可能是松原M5.7地震的发震触发，导致断层（扶余/松原-肇东断裂）重新活动。松原地震液化构造的研究为现代地震和灾害多发区的预测提供了深刻的见解。同时为研究古今沉积物中地震诱发的SSDS提供了丰富的基础材料。该研究对于揭示郯庐断裂带北部自21世纪以来进入地震活动活跃阶段具有重要意义。NE-SW（35°～215°）趋向压应力可能是松原M5.7地震的发震触发，导致断层（扶余/松原-肇东断裂）重新活动。松原地震液化构造的研究为现代地震和灾害多发区的预测提供了深刻的见解。同时为研究古今沉积物中地震诱发的SSDS提供了丰富的基础材料。该研究对于揭示郯庐断裂带北部自21世纪以来进入地震活动活跃阶段具有重要意义。松原地震液化构造的研究为现代地震和灾害多发区的预测提供了深刻的见解。同时为研究古今沉积物中地震诱发的SSDS提供了丰富的基础材料。该研究对于揭示郯庐断裂带北部自21世纪以来进入地震活动活跃阶段具有重要意义。松原地震液化构造的研究为现代地震和灾害多发区的预测提供了深刻的见解。同时为研究古今沉积物中地震诱发的SSDS提供了丰富的基础材料。该研究对于揭示郯庐断裂带北部自21世纪以来进入地震活动活跃阶段具有重要意义。