THE HOLOCENE SEISMIC EVIDENCE ON SOUTHERN SEGMENT OF THE RED RIVER FAULT ZONE

doi:10.3969/j.issn.0253-4967.2016.03.007

Abstract

Abstract:

Nine earthquakes with M≥6 have stricken the northern segment of the Red River fault zone since the historical records, including the 1652 Midu M7 earthquake and the 1925 Dali M7 earthquake. However, there have been no earthquake records of M≥6 on the middle and southern segments of the Red River Fault, since 886 AD. Is the Red River fault zone, as a boundary fault, a fault zone where there will be not big earthquake in the future or a seismogenic structure for large earthquake with long recurrence intervals?This problem puzzles the geologists for a long time. Through indoor careful interpretation of high resolution remote sensing images, and in combination with detailed field geological and geomorphic survey, we found a series of fault troughs along the section of Gasha-Yaojie on the southern segment of the Red River fault zone, the length of the Gasha-Yaojie section is over ten kilometers. At the same time, paleoseismic information and radiocarbon dating result analysis on the multiple trenches show that there exists geological evidence of seismic activity during the Holocene in the southern segment of the Red River fault zone.

Key words: the Red River fault zone, seismogenic structure of large earthquake, multiple trenches, paleoearthquake, the Holocene active fault

摘要：

有历史记录以来，红河断裂带北段曾发生包括1652年弥渡7级地震和1925年大理7级地震在内的6.0级以上地震9次。然而，红河断裂中、南段自公元886年有历史地震记录以来，没有1次6.0级以上地震记录。红河断裂带作为边界断裂是在废弃，未来不会有大地震发生，还是为长周期大地震的孕震构造？这个问题一直困绕着地质学界。通过室内高分辨率遥感影像的判读，并结合详细的野外地质、地貌调查，在红河断裂南段戛洒-腰街一带发现了一系列槽谷地貌，在十几km的地段都有显示；同时，组合探槽揭露的古地震信息及¹⁴C样品测年分析表明，红河断裂南段存在全新世期间地震活动的地质证据。

关键词: 红河断裂带, 大地震孕震构造, 组合探槽, 古地震, 全新世活动断裂

CLC Number:

P315.2

LI Xi, RAN Yong-kang, CHEN Li-chun, WANG Hu, YU Jiang, ZHANG Yan-qi, XIE Ying-qing. THE HOLOCENE SEISMIC EVIDENCE ON SOUTHERN SEGMENT OF THE RED RIVER FAULT ZONE[J]. SEISMOLOGY AND GEOLOGY, 2016, 38(3): 596-604.

李西, 冉勇康, 陈立春, 王虎, 于江, 张彦琪, 谢英情. 红河断裂带南段全新世地震活动证据[J]. 地震地质, 2016, 38(3): 596-604.

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