【摘要】 地处粤东的潮汕平原发育北西向与北东向两组活动断裂。经航片仔细解译 ,发现黄岗水断裂和丰顺 -汕头断裂的部分段落呈明显水系左旋位错现象。野外调查证实了沿该两条断裂的地貌体位移 ,并选择 3处位移点作了大比例尺地形图测绘 ,对被位移地貌体进行了采样测年。经计算 ,黄岗水断裂和丰顺 -汕头断裂的全新世左旋走滑运动平均速率分别达 1 11±0 0 9～ 2 6 9± 0 2 4mm a和 3 2 6± 0 2 6mm a。这些较强活动的北西向断裂延伸入海与海域水深4 0～ 50m处的北东向牛山岛 -兄弟屿 -南澎列岛强活动断裂的交汇处是发生强震的有利部位更多还原

【Abstract】 Two sets of active faults,northwest\| and northeast\|trending faults,are developed in the Chaoshan Plain of East Guangdong. After detailed interpretation of aerophotos,we have found out that there is the clear phenomenon of sinistral dislocation of drainage system on the Huanggangshui fault and part of Fengshun\|Shantou fault. Field investigation confirmed that the geomorphic bodies along the two faults have undergone displacement. Large\|scale topographic mapping was made at three displaced sites and samples for age dating were collected from the geomorphic bodies. Calculation indicates that the average rate of sinistral strike\|slip movement in the Holocene time amounts to 1.11±0.09～2.69±0 24 mm/a along the Huanggangshui fault and 3.26±0.26 mm/a along the Fengshun\|Shantou fault. These two more active NW\|trending faults extend into sea area,where they intersect the NE\|trending strongly active Niushan Island\|Xiongdi Isle\|Nanpeng Isles fault at a depth of 40～50 m in water. The intersection is a location favorable for strong earthquakes to occur.更多还原