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Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/1004

Authors: Sugiyama, Y.*
Mizuno, K.*
Nanayama, F.*
Sugai, T.*
Yokota, H.*
Hosoya, T.*
Miura, K.*
Takemura, K.*
Kitada, N.*
Title: Study of blind thrust faults underlying Tokyo and Osaka urban areas using a combination of high-resolution seismic reflection profiling and continuous coring
Issue Date: 2003
Series/Report no.: 46 (5)
URI: http://hdl.handle.net/2122/1004
Keywords: blind thrust
fault-related fold
flexure
high-resolution seismic reflection profiling
continuou scoring
Abstract: We acquired high-resolution seismic reflection profiles and continuously cored boreholes to evaluate active flexures produced by major blind thrust fault systems within two densely populated Neogene-Quaternary sedimentary basins in Japan: the Fukaya Fault System near Tokyo in the Kanto Basin and the Uemachi Fault System in the Osaka Basin. The high-resolution seismic reflection survey made clear the length, geometry and growth history of fault-related folds, or flexures formed above the two blind thrusts. Continuously cored boreholes linked with high-resolution seismic profiles enabled us to estimate the uplift rate as defined by shallow stratigraphic horizons and constrain the age of the most recent growth of the flexures during earthquakes on the Fukaya and Uemachi fault systems. Even with the high quality of the data we collected, it is still not possible to exactly constrain the age of the most recent blind thrust earthquake recorded by flexure of these fault-related folds. Data presented in this paper form the basis for future efforts aimed at mechanical and kinematic models for fault growth to evaluate the activity of blind thrusts underlying urban areas.
Appears in Collections:04.06.10. Instruments and techniques
Annals of Geophysics

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