东昆仑断裂带东段玛曲断裂古地震初步研究  

Palaeo-earthquake Study on the Maqu Fault of East Kunlun Active Fault

作　　者：何文贵[1] 熊振[2] 袁道阳[1] 葛伟鹏[1] 刘兴旺[1] 

机构地区：[1]中国地震局地震预测研究所兰州科技创新基地 [2]中国地震局地球物理研究所,北京100081

出　　处：《中国地震》2006年第2期126-134,共9页Earthquake Research in China

基　　金：中国地震局南北地震带中强地震短临跟踪项目;中国地震局地震联合基金(104073);国家自然科学基金(40372086)共同资助

摘　　要：东昆仑活动断裂是青藏高原东北部一条重要的NWW向边界断裂。玛曲断裂位于东昆仑断裂带的最东段。本文通过3个古地震剖面揭示出东昆仑断裂东段玛曲断裂全新世共有4次古地震事件。最新一次古地震事件为距今(1730±50)～(1802±52)a,第二次古地震的时间为距今(3736±57)～(4641±60)a;第三次为距今(8590±70)a;第四次为距今(12200±1700)a。其中第一次和第二次古地震事件的时间较为可靠,两次古地震事件之间的复发间隔为2400a左右,由此认为东昆仑断裂带东段的古震事件之间的复发间隔为2400a左右,古地震的离逝时间为距今(1730±50)～(1802±52)a。The East Kunlun active fault is an important NWW-trending boundary fault on the northeastern margin of the Qinghai-Xizang（Tibet） Plateau. Maqu fault is the easternmost segment of the East Kunlun active fault. Based on the three trenching, four Holocene palaeo-earthquake events are identified since Holocene along the Maqu Fault. The interval is between （ 1730 ± 50）a and （ 1802 ±52）a from nowadays to the time of the latest palae-earthquake event, and interval of the second palaeo-earthquake events is between （3736 ± 57）ka and （4641 ± 60）ka, and the third palaeo-earthquake events is （8590 ± 70）ka based on nowadays, and the last times is （12.2 ± 1.7） ka to nowadays. Thereinto, time of the first and second palaeo-earthquake events is more credibility than the third and last times. As a result, recurrence intervals of the palaeo-earthquake events about the easternmost segment of the East Kunlun active fault is approximately 2400 ka, and the palaeo- earthquake Elapsed time is between （1730 ± 50）a and （ 1802 ± 52） form nowadays.

关 键 词：东昆仑断裂带 玛曲断裂 古地震 

分 类 号：P315[天文地球—地震学]