Research output: Contribution to journal › Article › peer-review
Possible sources of hydrothermal activity and mud volcanism in southern Sakhalin inferred from local earthquake seismic tomography. / Koulakov, Ivan; Serdyukov, Aleksander S.; Konovalov, Alexey V. et al.
In: Geochemistry, Geophysics, Geosystems, Vol. 18, No. 5, 01.05.2017, p. 1943-1958.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Possible sources of hydrothermal activity and mud volcanism in southern Sakhalin inferred from local earthquake seismic tomography
AU - Koulakov, Ivan
AU - Serdyukov, Aleksander S.
AU - Konovalov, Alexey V.
AU - Mikhailov, Valentin I.
AU - Safonov, Dmitry A.
AU - Duchkov, Anton A.
AU - Al-Arifi, Nassir
AU - El Khrepy, Sami
PY - 2017/5/1
Y1 - 2017/5/1
N2 - We present the first seismic model of the crust beneath Sakhalin based on P and S-wave arrival time data from local earthquakes. Based on the results of numerous synthetic tests, we conclude that this model has fair horizontal and vertical resolution to 20–25 km depth. At shallow depths, seismic anomalies are clearly associated with known geological structures, such as the high-velocity Paleozoic Susunai block and the low-velocity Cenozoic fold belts along the West Sakhalin Mountains. In vertical sections, we observe westward underthrusting of the Susunai block to a distance of at least 70 km, which may represent the regional compression and considerable crustal shortening in this area. Based on the tomography results, we hypothesize about the origin of the mud volcanism in southern Sakhalin. We propose that because of the general westward underthrusting regime in Sakhalin, hydrocarbon-rich shelf sediments may be entrained to considerable depths under the rigid Susunai block, which serves as a nonpermeable cover. The released gases find the weakest zones around the Susunai block and along the Tym-Poronay Fault and escape to the surface to form the South Sakhalin and Lesnovsky mud volcano fields.
AB - We present the first seismic model of the crust beneath Sakhalin based on P and S-wave arrival time data from local earthquakes. Based on the results of numerous synthetic tests, we conclude that this model has fair horizontal and vertical resolution to 20–25 km depth. At shallow depths, seismic anomalies are clearly associated with known geological structures, such as the high-velocity Paleozoic Susunai block and the low-velocity Cenozoic fold belts along the West Sakhalin Mountains. In vertical sections, we observe westward underthrusting of the Susunai block to a distance of at least 70 km, which may represent the regional compression and considerable crustal shortening in this area. Based on the tomography results, we hypothesize about the origin of the mud volcanism in southern Sakhalin. We propose that because of the general westward underthrusting regime in Sakhalin, hydrocarbon-rich shelf sediments may be entrained to considerable depths under the rigid Susunai block, which serves as a nonpermeable cover. The released gases find the weakest zones around the Susunai block and along the Tym-Poronay Fault and escape to the surface to form the South Sakhalin and Lesnovsky mud volcano fields.
KW - crustal deformation
KW - mud volcanoes
KW - Sakhalin
KW - seismic tomography
KW - SUBDUCTION ZONE
KW - DEEP-STRUCTURE
KW - SEA
KW - ATMOSPHERE
KW - PLATE BOUNDARY
KW - ISLAND
KW - METHANE
KW - GAS
KW - GRYPHON ACTIVITY
KW - PALEOMAGNETISM
UR - http://www.scopus.com/inward/record.url?scp=85019162869&partnerID=8YFLogxK
U2 - 10.1002/2017GC006820
DO - 10.1002/2017GC006820
M3 - Article
AN - SCOPUS:85019162869
VL - 18
SP - 1943
EP - 1958
JO - Geochemistry, Geophysics, Geosystems
JF - Geochemistry, Geophysics, Geosystems
SN - 1525-2027
IS - 5
ER -
ID: 10193643