礼县-罗家堡断裂带宕昌-黄咀段全新世活动的地貌证据

The Geomorphologic Evidences of Activity in Tanchang-Huangzui Segment of Lixian-Luojiabao Fault Zone since the Holocene

摘要:

普遍认为礼县-罗家堡断裂带是一条晚第四纪活动断裂,是1654年天水南8级大地震的发震构造。但该断裂带西段宕昌-黄咀段的活动证据一直以来不是很明确。笔者在进行某项目近场地质调查中,发现一些该断裂段的最新地貌活动证据,认为该断裂段在全新世有过明显活动。

Abstract:

It is generally considered that Lixian-Luo Jiabao fault zone is an active fault in late quaternary period, and it is also the seismogenic structure of Tianshui M_s8.0 earthquake in 1654. But the activity evidences of Tanchang-Huangzui segment located at the western of that fault zone are not very indeterminate all the time. In the near-field geological investigation of some project, we found some latest geomorphological activity evidences of that fault segment, so we believed that at the fault segment there were obvious activities in the Holocene.