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  • 1
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    Paleoseismology of the Yangsan Fault, southeastern part of the Korean Peninsula (2006)
    INGV
    Details
    Publication Date: 2021-06-30
    Description: The NNE-trending Yangsan Fault (YSF) is the most prominent fault in the southeastern part of the Korean Peninsula and has a continuous trace about 200 km long. Activity on this fault was recently investigated using aerial photographs, topographic analysis, and trenching. The geomorphologic evidence of Late Quaternary faulting is clearly recognized on both the northern (Yugyeri and Tosung-ri areas) and southern parts (Eonyang to Tongdosa area) of the fault. The main YSF is marked by a zone of shattered rock that is tens of meters wide and zone of fault gouge. During the Late Quaternary, right-lateral movement occurred mainly on the southern part, as shown by lowangle striations on the fault plane, elongation of deformation features in the fault gouge. The estimated vertical slip rate is about 0.02-0.07 mm/yr, and the lateral slip rate may be several times larger than the vertical rate. The most recent event occurred prior to deposition of Holocene alluvium. In the northern part, the fault locally changes trend to almost N-S, dips to the east and has reverse movement. The average vertical slip rate is estimated less than 0.1 mm/yr. The most recent event probably occurred after 1314 cal. years BP (A.D. 536).
    Description: Published
    Description: JCR Journal
    Description: open
    Keywords: Yangsan Fault (YSF) ; Korean Peninsula ; averge slip rate ; most recent event ; 04. Solid Earth::04.04. Geology::04.04.01. Earthquake geology and paleoseismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Format: 1191475 bytes
    Format: application/pdf
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  • 2
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    Late Quaternary Paleoseismology of the Southern Steens Fault Zone, Northern Nevada (2007)
    Seismological Society of America
    Details
    Publication Date: 2007-10-01
    Description: The 192-km-long Steens fault zone is the most prominent normal fault system in the northern Basin and Range province of western North America. We use trench mapping and radiometric dating to estimate displacements and timing of the last three surface-rupturing earthquakes (E1-E3) on the southern part of the fault south of Denio, Nevada. Coseismic displacements range from 1.1 to 2.2+ or -0.5 m, and radiometric ages indicate earthquake times of 11.5+ or -2.0 ka (E3), 6.1+ or -0.5 ka (E2), and 4.6+ or -1.0 ka (E1). These data yield recurrence intervals of 5.4+ or -2.1 k.y. between E3 and E2, 1.5+ or -1.1 k.y. between E2 and E1, and an elapsed time of 4.6+ or -1.0 k.y. since E1. The recurrence data yield variable interval slip rates (between 0.2+ or -0.22 and 1.5+ or -2.3 mm/yr), but slip rates averaged over the past approximately 18 k.y. (0.24+ or -0.06 mm/year) are similar to long-term (8.5-12.5 Ma) slip rates (0.2+ or -0.1 mm/yr) measured a few kilometers to the north. We infer from the lack of significant topographic relief across the fault in Bog Hot Valley that the fault zone is propagating southward and may now be connected with a fault at the northwestern end of the Pine Forest Range. Displacements documented in the trench and a rupture length of 37 km indicate a history of three latest Quaternary earthquakes with magnitudes of M 6.6-7.1 on the southern part of the Steens fault zone.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences , Physics
    Published by Seismological Society of America
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