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Identification of active faults and tectonic features through heat flow distribution in the Nankai Trough, Japan, based on high-resolution velocity-estimated bottom-simulating reflector depths

Takenouchi, Shuto ; Tsuji, Takeshi ; Shiraishi, Kazuya ; Nakamura, Yasuyuki ; Kodaira, Shuichi ; Fujie, Gou ; Mukumoto, Kota

Earth, planets, and space, 2023-12, Vol.75 (1), p.147-16, Article 147 [Periódico revisado por pares]

Berlin/Heidelberg: Springer Berlin Heidelberg

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Título:
Identification of active faults and tectonic features through heat flow distribution in the Nankai Trough, Japan, based on high-resolution velocity-estimated bottom-simulating reflector depths
Autor: Takenouchi, Shuto ; Tsuji, Takeshi ; Shiraishi, Kazuya ; Nakamura, Yasuyuki ; Kodaira, Shuichi ; Fujie, Gou ; Mukumoto, Kota
Assuntos: 4. Seismology ; Active faults ; Advection ; Anomalies ; Automated velocity analysis ; Bottom-simulating reflector (BSR) ; Earth and Environmental Science ; Earth Sciences ; Earthquakes ; Environmental aspects ; Estimates ; Fault detection ; Fault lines ; Faults (Geology) ; Flow distribution ; Flow estimation ; Fluid flow ; Geological faults ; Geological structures ; Geology ; Geophysics/Geodesy ; Heat flow ; Heat transfer ; Heat transmission ; Japan ; Mathematical analysis ; Ocean floor ; Plates (tectonics) ; Plutonic rock ; Reflectors ; Sediments ; Sediments (Geology) ; Seismic activity ; Seismic analysis ; Seismic reflection data ; Seismic reflection method ; Seismic surveys ; Seismic waves ; Seismology ; Subduction (geology) ; Subduction zones (Geology) ; Tectonics ; Tectonics (Geology) ; Velocity
É parte de: Earth, planets, and space, 2023-12, Vol.75 (1), p.147-16, Article 147
Descrição: Estimates of heat flow can contribute to our understanding of geological structures in plate convergent zones that produce great earthquakes. We applied automated velocity analysis to obtain the accurate seismic profiles needed for precise heat flow estimates using six new seismic profiles acquired during R/V Kaimei KM18-10 voyage in 2018. We calculated heat flow values in the accretionary wedge of the Nankai Trough off the Kii Peninsula, Japan, from the positions of widespread bottom-simulating reflectors (BSRs) in seismic reflection profiles. Calculated conductive heat flow values from the depth of the BSR agree with previous studies where a regional trend is observed from ~ 50 mW/m 2 to < 40 mW/m 2 60 km landward from the deformation front. This trend is caused by thickening of accretionary sediments and the subduction of the Philippines Sea plate. Segments of profiles are marked by anomalous high heat flow values. Such anomalies represent alterations of the shallow crustal thermal structure caused either by a combination of topographic affects, surface erosion of the seafloor, or by fluid flow that transports heat by advection. We interpret heat flow anomalies (~ 100 mW/m 2 ) as indicators of active faulting, which correspond to low seismic velocity zones along faults. Our results also showed relatively high heat flow at the landward end of several survey lines close to the Kii Peninsula, which we interpret to the possible presence of plutonic rocks that underlie the Kii Peninsula and extend offshore and may be the cause of geothermal springs, steep geothermal gradients, and high heat flow. Graphical abstract
Editor: Berlin/Heidelberg: Springer Berlin Heidelberg
Idioma: Inglês

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Identification of active faults and tectonic features through heat flow distribution in the Nankai Trough, Japan, based on high-resolution velocity-estimated bottom-simulating reflector depths

Takenouchi, Shuto ; Tsuji, Takeshi ; Shiraishi, Kazuya ; Nakamura, Yasuyuki ; Kodaira, Shuichi ; Fujie, Gou ; Mukumoto, Kota

Berlin/Heidelberg: Springer Berlin Heidelberg

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