New constraints for slip rates along the Altyn Tagh fault, northwestern Tibet Plateau

Based on 10Be dating of offset terraces at two sites, fieldwork, and high-resolution topographic analysis, we obtained the Holocene slip rates along the central section of the Altyn Tagh fault (ATF). At the Alesayi site, the minimum slip rate is confined to 6.4–11.6 mm/yr since 6.0 ± 1.4 ka. At the...

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Vydáno v:Journal of structural geology Ročník 186; s. 105221
Hlavní autoři: Yuan, Zhaode, Huang, Jie, Gan, Junfeng, Liu, Hanlin
Médium: Journal Article
Jazyk:angličtina
Vydáno: Elsevier Ltd 01.09.2024
Témata:
Altyn Tagh fault
Earthquake
Slip rate
Strike-slip fault
Tibetan plateau
Tibetan plateau
Altyn Tagh fault
Strike-slip fault
Slip rate
Earthquake
ISSN:0191-8141, 1873-1201
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Popis
Shrnutí:Based on 10Be dating of offset terraces at two sites, fieldwork, and high-resolution topographic analysis, we obtained the Holocene slip rates along the central section of the Altyn Tagh fault (ATF). At the Alesayi site, the minimum slip rate is confined to 6.4–11.6 mm/yr since 6.0 ± 1.4 ka. At the Suman site, the slip rate is confined to 5.6–9.2 mm/yr since 7.6 ± 0.7 ka. Eventually, the slip rate is tightly bracketed from 6.4 to 9.2 mm/yr, which implies that the microplate model with localized deformation between rigid blocks should be abandoned. Synthesis of late Quaternary slip rates along the fault indicates that the central section, except for restraining bends, maintains a constant slip rate of ∼10 mm/yr. The long elapsed time, ∼400 years, since the most recent earthquake and a significant stress increase resulting from the 2014 Ms7.3 Yutian earthquake led to a high seismic risk along the central fault section.
ISSN:0191-8141
1873-1201
DOI:10.1016/j.jsg.2024.105221