关键词: ¹⁴C测年, 热释光测年, 陶片, 历史地震

Abstract: A trench across the Haiyuan active fault zone reveals many layers of charcoal with human bone,scruff,ceramic pieces or hearth ruin as well as three colluvial wedges in Ciergou paleoearhquake profile which is located on the northern margin of Tibet Plateau. It is important to distinguish these historical remnants as whether or not they are the product of earthquake. 12 radiocarbon dates and 6 post-IR OSL dates were determined from charcoal samples corresponding to human activity and sediments or burned clay samples around charcoal samples respectively. The ages of charcoal which mainly range from 1000 to 2400a BP were sharply younger than the age of strata. The age of living site inferred from charcoal with scruff,ceramic pieces,does not agree with timetable of the historical strong earthquake record. This evidence could indicate that the living site ruins is not the product of historical earthquake. The penultimate paleoearthquake prior to 1920 AD earthquake occurred in 21.8～14.5ka which was constrained by post-IR OSL dates. These dates would help to better understand the strong earthquake recurrence interval of the Haiyuan active fault zone.

Key words: radiocarbon dating, TL dating pottery, historical earthquake