摘要
对北京延庆西羊房古地震探槽西壁采集的 10个崩积物和坡面沉积物样品进行了细颗粒 (4～ 11μm)多测片的红外释光 (IRSL)和绿光释光 (GLSL)测年。其中 4个样品既在中国地震局地质研究所用Daybreak仪器作了测量 ,也在澳大利亚Adelaide大学物理系用Ris 仪器作测量 ,其结果基本一致。该探槽剖面见 4个断层崩积楔 ,可视为 4次古地震事件的记录。释光测年表明 ,最新一个崩积楔有可能是公元 2 94年延庆东居庸村 6级地震的地质记录 ,大约在 1 7～2 0kaBP或 1 7～ 2 4kaBP期间至少有两次强烈地震事件。本文还对比了细颗粒GLSL与IRSL的测年结果。
Ten samples of slope-wash and colluvial deposits from a trench wall at Xiyangfang,Yanqing County,located in the northern margin fault zone of the Yanqing Basin,about 90 km northwest Beijing,have been dated by both green light stimulated emission (GLSL) and infrared stimulated emission (IRSL).Four of the samples were measured in both Adelaide (Ris equipment) and Beijing (Daybreak equipment),with essentially consistent results.The Xiyangfang trench wall presents four fault-scarp-collapsed wedges,showing a clear normal faulting pattern,which can be interpredted as a record of palaeo-earthquake events, covering a time period from about 28 ka to modern.The youngest wedge may be referred as a geologic record of an intense earthquake occurred at Juyong village in eastern Yanqing in AD 294.In addition,two strong earthquakes were at least recorded during the period from about 1.7 ka～20 ka or 1.7 ka～24 ka.The paper gives a comparison of equivalent dose values obtained by both GLSL and IRSL.
出处
《中国地震》
CSCD
北大核心
2001年第2期176-186,共11页
Earthquake Research in China
基金
国家自然科学基金项目 ( 4 95 713 96和 4 0 0 0 2 0 13 )
澳中科技合作计划资助
