Oh, Jeong-Sik Seong, Yeong Bae Strom, Alexander Yu, Byung Yong 2024-01-19T17:01:30Z 2024-01-19T17:01:30Z 2022-01-25 2020-08 0921-030X https://pubs.kist.re.kr/handle/201004/118281 The assumed Jargalant rockslide is located in Khentey Upland of Mongolia, an area undergoing active tectonic deformation and seismogenic activity but where geomorphic research that connects rock slope failure and long-term paleoseismic events has yet to be conducted. We present the first reconnaissance study on this topic, which demonstrates the possibility of cosmogenic Be-10 dating of landslide-induced bouldery deposits to date the timing of the assumed seismic events. We performed integrated geomorphic analysis (geomorphic mapping, topographic profile analysis, and surface trenching) and Be-10 surface exposure dating (boulder and bedrock scar) to document the recurrence interval of the assumed paleoseismic events by determining the recurrence of rock slope failures in Jargalant River valley. We identified four geomorphic surfaces and units identified based on their morphology, the distribution of quartzite boulders, and their ages. The geomorphic units are as follows: (1) outburst flood fan (S1), (2) remnant landslide-dam deposit (S2), (3) surviving rockslide body (S3), and landslide scar (S4). Bedrock quartzite outcrops only in the assumed headscarp, while most of the upland is composed of schist. The average Be-10 age of quartzite boulders of S1 to S3 is 283.4, 138.8, and 48.4 ka, respectively, and that of the landslide scar (inner and outer edge) are 44.5 and 193.5 ka. Based on the morphology, depositional characteristics, quartzite provenance, and separated and clustered Be-10 exposure age, we hypothesize that at least three catastrophic rock slope failures could occur at 283 ka, 138 ka, and 48 ka, likely being triggered by earthquakes associated with active Kherlen fault. English SPRINGER Bouldery deposits along the Kherlen fault, Central Khentey, Mongolia: implications for paleoseismology Article 10.1007/s11069-020-03983-0 1 NATURAL HAZARDS, v.103, no.1, pp.189 - 209 NATURAL HAZARDS 103 1 189 209 N scie scopus 000530793800001 2-s2.0-85084422997 Geosciences, Multidisciplinary Meteorology & Atmospheric Sciences Water Resources Geology Meteorology & Atmospheric Sciences Water Resources Article DEBRIS-FLOW COSMOGENIC RADIONUCLIDES ALLUVIAL FANS HALF-LIFE BE-10 RATES LANDSLIDES EARTHQUAKE CALIFORNIA ULAANBAATAR Outburst flood deposit Bouldery deposit Be-10 surface exposure dating Landslide Earthquake Kherlen fault