罗山东麓断裂最后一次错动事件的再研究

RE STUDY ON THE LAST RUPTURE EVENT ALONG FAULT AT EASTERN PIEDMONT OF THE LUOSHAN MT.

对探槽剖面和陡崖地貌进行了综合分析．结果表明，罗山东麓山坡上发育的少量有自由面的年轻陡坎是重力滑坡的后缘面，与罗山东麓断裂错动无关．该断裂最后一次错动事件发生的时间是（２ １０５ ±１７５）ａ Ｂ． Ｐ．．结合前人研究的古地震重复资料，估算了罗山东麓断裂未来５０ 年７

Section of 5 test grooves and landforms of scarps along fault at eastern piedmont of the Luoshan Mt.are analysed and studied comprehensively.It is showed that a few young scarps with free surfaces along the slopes of eastern piedmont of the Luoshan Mt.are backside walls of gravity landslides,with no relation to the fault motion. The time before present of the last rupture event along faults at the eastern piedmont of the Luoshan Mt.is (2 105±175)a.The occurrence probability of M S≥7.0 earthquakes along the fault in future 50 year is estimated.