罗山东麓断裂全新世古地震研究

THE STUDY ON THE PALEOEARTHQUAKES ON THE EASTERN PIEDMONT FAULT OF THE LUOSHAN MOUNTAINS IN HOLOCENE

罗山东麓断裂全新世活动强烈,古地震现象丰富。探槽揭露出晚更新世末或全新世初以来,已发生过5次7级左右的古地震事件,除最早的一次时间不明外,其它4次分别发生在距今约8400年、5400—5020年、3900年和2260年。全新世早期古地震重复间隔在3000年左右,晚期为1500年左右。

The fault on the eastern piedmont of the Luoshan Mountatins was strong active fault in Holocene and exists mang paleoearthquakes phenomean. The trench show that five pal eoearthquakes since the late period of late Pleistocene or Holocene, except the first one, the others respectively took place about 8400 years ago, 5400—5020 years ago, 3900 years ago and 2260 years ago and the recurrence intervals is about 3000 years in the early Holocene, 1500 years in the late Holocene.