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We acquired high-resolution seismic reflection profiles and continuously cored boreholes to evaluate active flexures&#13; produced by major blind thrust fault systems within two densely populated Neogene-Quaternary sedimentary&#13; basins in Japan: the Fukaya Fault System near Tokyo in the Kanto Basin and the Uemachi Fault System in&#13; the Osaka Basin. The high-resolution seismic reflection survey made clear the length, geometry and growth history&#13; of fault-related folds, or flexures formed above the two blind thrusts. Continuously cored boreholes linked&#13; with high-resolution seismic profiles enabled us to estimate the uplift rate as defined by shallow stratigraphic&#13; horizons and constrain the age of the most recent growth of the flexures during earthquakes on the Fukaya and&#13; Uemachi fault systems. Even with the high quality of the data we collected, it is still not possible to exactly constrain&#13; the age of the most recent blind thrust earthquake recorded by flexure of these fault-related folds. Data&#13; presented in this paper form the basis for future efforts aimed at mechanical and kinematic models for fault&#13; growth to evaluate the activity of blind thrusts underlying urban areas

annals of geophysics

Study of blind thrust faults underlying Tokyo and Osaka urban areas using a combination of high-resolution seismic reflection profiling and continuous coring