Multichannel seismic reflection profiling in the Suruga Trough.

During January 1978, the Hydrographic Department, Maritime Safety Agency acquired approximately 94km of digitally recorded 48 channel seismic reflection data using high-pressure, large volume air guns on the R/V Takuyo-maru (Japan Petroleum Exploration Co.) on three track lines in the Suruga Trough off Sizuoka Prefecture, Japan (Figure 1, 2, 3 and Table 1). Three multichannel seismic reflection profiles, which reveal a structure of the upper crust having a depth of 11-14 km, were processed from the data using the common depth point technique with 24 folds. The authors found strata and faults from interpretation of the profiles (Figure 4), and also drew P wave velocity structure derived from velocity analysis using the common depth point technique (Table 2 and Figure 5). Especially, the authors considered fault zone along the Suruga Trough as follows : 1) The fault zone located along the west side of the Trough axis is vertical or slanted apparently westward. 2) The fault zone is possibly a reverse fault, because the Senoumi North Bank and South Bank in the western part of the fault zone are tilted blocks tilting to the west with the fault zone as a fault scarp, and strata of the eastern part of the fault zone show homocline-like structure slanting toward the Trough. 3) The strike of the fault zone shows a largely north-south trend. 4) The fault zone was formed after sedimentation of the B layer corresponding to the middle to late Tertiary (Table 3), and the tectonic movement which produced fault zone has continued until the recent period.

Bibliographic Details

Main Authors:	Sakurai, Misao, Mogi, Akio
Format:	Journal Contribution biblioteca
Language:	Japanese
Published:	1980
Online Access:	http://hdl.handle.net/1834/16257
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