Paleoearthquakes along the northeastern segment of the Yabrai range‐front fault in the Alashan Block, northeast of the Tibetan Plateau

• DOI: 10.1002/jqs.3690
• Publication Date: 2025-01-06T07:56:06Z
• Authors: Chao Xie; Wei Li; Xiang Liu; Hao Dang; Yuemin Huang; Pengwei Long

ABSTRACT The Yabrai range‐front fault (YRF) is a large‐scale within the Alashan Block, located northeast of Tibetan Plateau, which has undergone several surface rupture events on southwestern and middle segments since late Quaternary. As no relevant research been conducted northeastern segment, paleoseismic data for this area are lacking, restricts our overall understanding spatiotemporal intensity distribution strong earthquakes YRF. To address problem, we investigations based trench wall interpretation stratigraphic optically stimulated luminescence ages. Four paleoearthquakes were identified in occurred after 11.6 ± 0.7 ka between to 6.9 0.5, 0.5 4.8 0.6 3.9 ka, respectively. Three paleoearthquake events, one at around 23.6 1.6 end fault. According ruptured YRF, segment may be long seismic gap (~8 ka), combined with status tectonic stress concentration, can regarded as zone high probability ability produce magnitude 7.2 earthquake. Furthermore, from Pleistocene early Holocene, cascading ruptures have magnitudes approaching 7.3. In terms relationships, suggest that YRF Langshan piedmont two independent faults even though they connected.