摘要
The East Kunlun active fault is an important NWW-trending boundary fault on the northeastern margin of the Qinghai-Xizang (Tibet) Plateau. The Maqu fault is the easternmost segment of the East Kunlun active fault. Based on three trenches, four Holocene palaeo-earthquake events are identified along the Maqu fault. The latest palaeo-earthquake event is (1730±50) ～ (1802±52) a BP, the second is (3736±57) ～ (4641±60) a BP, the third is (8590±70) a BP, and the earliest is (12200±1700) ka BP. The time of the first and second palaeo-earthquake events is more reliable than that of the third and last ones. As a result, the recurrence interval of the palaeo-earthquakes on the easternmost segment of the East Kunlun active fault is approximately 2400 a, and the palaeo-earthquake elapsed time is (1730±50) ～ (1802±52) a BP.
The East Kunlun active fault is an important NWW-trending boundary fault on the northeastern margin of the Qinghai-Xizang （Tibet） Plateau. The Maqu fault is the easternmost segment of the East Kunlun active fault. Based on three trenches, four Holocene palaeoearthquake events are identified along the Maqu fault. The latest palaeo-earthquake event is （ 1730 ± 50） - （ 1802 ± 52） a BP, the second is （3736 ± 57） - （4641 ±60） a BP, the third is （8590± 70） a BP, and the earliest is （ 12200 ±1700） ka BP. The time of the first and second palaeo-earthquake events is more reliable than that of the third and last ones. As a result, the recurrence interval of the palaeo-earthquakes on the easternmost segment of the East Kunlun active fault is approximately 2400 a, and the palaeo-earthquake elapsed time is （1730 ± 50） - （ 1802 ± 52） a BP.
基金
The project wasjointlysupported bythefollow-up projectsof moderately strong earthquake prediction of the North-South earthquake zone of China Earthquake Administration,theJoint Earthquake Science Foundation of CEA (104073) and the National Natural science Foundation of China(40372086) .Contribution No.LC20060016 of Lanzhou Institute of Seismology of CEA
