Research output: Contribution to journal › Article › peer-review
Surface-rupturing paleoearthquakes in the Kurai Fault Zone (Gorny Altai, Russia): Trenching and geophysical evidence. / Turova, Irina; Deev, Evgeny; Pozdnyakova, Nataliya et al.
In: Journal of Asian Earth Sciences, Vol. 197, 104399, 01.08.2020.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Surface-rupturing paleoearthquakes in the Kurai Fault Zone (Gorny Altai, Russia): Trenching and geophysical evidence
AU - Turova, Irina
AU - Deev, Evgeny
AU - Pozdnyakova, Nataliya
AU - Entin, Andrey
AU - Nevedrova, Nina
AU - Shaparenko, Ilya
AU - Bricheva, Svetlana
AU - Korzhenkov, Andrey
AU - Kurbanov, Redzhep
AU - Panin, Andrey
PY - 2020/8/1
Y1 - 2020/8/1
N2 - The Kurai Fault Zone (KFZ) is one of the most hazardous seismogenic structures in the Gorny Altai (Russia). The KFZ have generated five paleoearthquakes with Mw = 6.6–7.6 and ESI 2007 shaking intensities of VIII to XI. The ultimate event, presumably in the second half of the 18th century, was preceded by four paleoearthquakes approximately 1.3, 3.2, 5.8, and 6.3 ka ago. The morphology of fault scarps, trenching results, deformation features in Neogene sediments, as well as electric resistivity surveys, reveal reverse slip mechanisms. All earthquakes were sourced by south-dipping backthrusts with respect to the main north-dipping reverse and thrust faults along which the Kurai Range is stepping over the two basins. The backthrusting maintains the growth of forebergs in front of the Kurai Range. Narrow basins limited by reverse faults separate forebergs from the Chuya and Kurai basins. Joint interpretation of geological (including trenching) and geophysical (ERT and GPR) data reveals the resistivity structure of the area with seismogenic faults traceable to depths of 40–50 m. The KFZ model, with the reconstructed relationships between the intramontane basins and the flanking mountains, as well as the structural control of large earthquakes, makes good reference for other worldwide regions of current and past seismicity in compressional settings. Assessment of probable magnitudes and recurrence of earthquakes within the KFZ is of special importance in view of the future deployment of the gas pipeline from Russia to China.
AB - The Kurai Fault Zone (KFZ) is one of the most hazardous seismogenic structures in the Gorny Altai (Russia). The KFZ have generated five paleoearthquakes with Mw = 6.6–7.6 and ESI 2007 shaking intensities of VIII to XI. The ultimate event, presumably in the second half of the 18th century, was preceded by four paleoearthquakes approximately 1.3, 3.2, 5.8, and 6.3 ka ago. The morphology of fault scarps, trenching results, deformation features in Neogene sediments, as well as electric resistivity surveys, reveal reverse slip mechanisms. All earthquakes were sourced by south-dipping backthrusts with respect to the main north-dipping reverse and thrust faults along which the Kurai Range is stepping over the two basins. The backthrusting maintains the growth of forebergs in front of the Kurai Range. Narrow basins limited by reverse faults separate forebergs from the Chuya and Kurai basins. Joint interpretation of geological (including trenching) and geophysical (ERT and GPR) data reveals the resistivity structure of the area with seismogenic faults traceable to depths of 40–50 m. The KFZ model, with the reconstructed relationships between the intramontane basins and the flanking mountains, as well as the structural control of large earthquakes, makes good reference for other worldwide regions of current and past seismicity in compressional settings. Assessment of probable magnitudes and recurrence of earthquakes within the KFZ is of special importance in view of the future deployment of the gas pipeline from Russia to China.
KW - Electrical resistivity tomography
KW - Gorny Altai
KW - Ground penetrating radar
KW - Kurai Fault Zone
KW - Paleoseismology
KW - Seismic hazard
KW - SYSTEM
KW - TIEN-SHAN
KW - CHUYA EARTHQUAKE
KW - DEEP-STRUCTURE
KW - TECTONICS
KW - REGION
KW - QUATERNARY SEDIMENTS
KW - AREA
KW - SOUTH
KW - INSIGHTS
UR - http://www.scopus.com/inward/record.url?scp=85084832550&partnerID=8YFLogxK
U2 - 10.1016/j.jseaes.2020.104399
DO - 10.1016/j.jseaes.2020.104399
M3 - Article
AN - SCOPUS:85084832550
VL - 197
JO - Journal of Asian Earth Sciences
JF - Journal of Asian Earth Sciences
SN - 1367-9120
M1 - 104399
ER -
ID: 24311404