Prehistoric earthquakes and fault scarps in the Barguzin fault zone (Baikal Rift system) |
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Affiliation: | Institute of the Earth’s Crust, Siberian Branch of the RAS, 128 ul. Lermontova, Irkutsk, 664033, Russia;Siberian Branch of the RAS, 3 prosp. Akad. Koptyuga, Novosibirsk, 630090, Russia |
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Abstract: | We studied fault scarps produced by prehistoric earthquakes in the Barguzin fault zone and estimated the ages and the magnitudes of the scarp-forming events in each scarp segment from their structure, morphology, and scarp parameters. Morphological and structural data reveal two to four surface-rupturing events with displacement up to 5–9.5 m, and two events showed 14C ages of 4.5 and 9 kyr. The area of the Barguzin Fault may have experienced six 7.5 ≤ M < 8.0 earthquakes and two M ≥ 8.0 (8.0–8.2) events for the past 10–12 kyr. |
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