Geomorphological and geological characteristics reflecting the Holocene activity of the Dalangsonggou fault, eastern Tibetan Plateau

IF 1.9 3区地球科学 Q3 GEOGRAPHY, PHYSICAL

Quaternary International Pub Date : 2024-04-08 DOI:10.1016/j.quaint.2024.03.012

Mingjian Liang , Feipeng Huang , Hong Zuo , Cheng Liao , Weiwei Wu , Kai Sun , Yue Gong

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Abstract

The Dalangsonggou (DLSG) fault is an internal fault within the Sichuan–Yunnan block, located on the southern side of the Garzê–Yushu fault. On the basis of geological and geomorphological surveys, we estimated the Holocene activity of the DLSG fault. We excavated two trenches and identified two paleoseismic events by analyzing the stratigraphic deformation and radiocarbon dating results of the faulted strata. The occurrence times of these events were determined to be 8420–8346 and 4612–5045 cal BP. The time elapsed since the latest earthquake, which exceeds 4500 years, indicates strong risk of occurrence of a large earthquake on the DLSG fault. Furthermore, the recurrence interval of large earthquakes on the DLSG fault is much longer than that of earthquakes on the Garzê–Yushu fault. Thus, the DLSG fault conducts only regulating effects in terms of regional tectonic deformation compared to the dominant impact of the Garzê–Yushu fault, which is a boundary fault of the block.

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反映青藏高原东部大浪松沟断层全新世活动的地貌和地质特征

大浪松沟（DLSG）断层是四川-云南地块内的一条内部断层，位于加孜-玉树断层的南侧。在地质和地貌调查的基础上，我们对大凉松沟断层的全新世活动进行了估算。我们挖掘了两条壕沟，通过分析断层地层的地层变形和放射性碳测年结果，确定了两个古地震事件。这些事件的发生时间被确定为公元前 8420-8346 年和 4612-5045 年。最近一次地震距今已超过 4500 年，这表明 DLSG 断层极有可能发生大地震。此外，DLSG 断层大地震的重现间隔远长于加孜-玉树断层。因此，在区域构造变形方面，DLSG 断层只起调节作用，而作为地块边界断层的加孜-玉树断层则起主导作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Quaternary International 地学-地球科学综合

CiteScore

5.60

自引率

4.50%

发文量

336

审稿时长

3 months

期刊介绍： Quaternary International is the official journal of the International Union for Quaternary Research. The objectives are to publish a high quality scientific journal under the auspices of the premier Quaternary association that reflects the interdisciplinary nature of INQUA and records recent advances in Quaternary science that appeal to a wide audience. This series will encompass all the full spectrum of the physical and natural sciences that are commonly employed in solving Quaternary problems. The policy is to publish peer refereed collected research papers from symposia, workshops and meetings sponsored by INQUA. In addition, other organizations may request publication of their collected works pertaining to the Quaternary.