【摘要】 结合前人研究结果和野外考察,发现1936年甘肃康乐6(3/4)级地震的地表破裂带长14 km,走向NWW,主要由3小段(西段、中段和东段)呈右阶排列而成。地表破裂主要有地震陡坎、地裂缝等。西段长3.7 km,有新鲜的崩塌堆积;中段长4.4 km,有大规模的基岩崩塌,同震左旋位移和垂直位移分别为2.5 m和0.6 m;东段长约6 km,同震水平位移和垂直位移分别为1.5 m和0.3 m。同震变形以左旋走滑为主,兼具逆冲分量,最大地表垂直位错量(0.6 m)仅为水平位错量(2.5 m)的(1/4)。1936年康乐地震时崩落的岩块上零星生长着最大直径仅20~30 mm的丽石黄衣,部分无地衣生长,此次地震由围子山—大夏河断裂向东扩张所致。更多还原

【Abstract】 Combined with the previous studies and the field surveys of Kangle M6(3/4) earthquake in 1936,we found that the length of surface rupture is about 14 km,the strikes of it is NWW. The surface rupture is mainly constituted of 3 segments( the western,the middle and the eastern segements) and exhibits a right-stepping arranging,and the rupture phenomena in extreme seismic zone are mainly earthquake scarp and ground fissures etc..The western segment where the fresh rock falls accumulated extends about 3. 7 km; the middle segment where huge scale rock falls extends about 4. 4 km,the coseismic left-lateral and uplift displacements in the middle segment is 2. 5 m and 0. 6 m respectively; the eastern segment extends about 6 km,and the coseismic horizontal and uplift offsets is 1. 5 m and 0. 3 m respectively. The coseismic deformation caused by the earthquake is mainly left-lateral with thrust components,the maximum surface uplift dislocation( 0. 6m) is one-fourth of horizonal component( 2. 5m). The falling rocks caused by Kangle M6(3/4) earthquake in 1936 have scattered distributed Xanthoria elegans with a maximum diameter about 20 ~ 30 mm,some falling rock without any lichens. The Kangle M6(3/4) earthquake is caused by the eastern-extension activity of Weizishan-Daxiahe Fault.更多还原