Supplementary Materials for “The submarine fault scarp of the 2011 Tohoku-oki Earthquake in the Japan Trench” by Ueda et al.

Supplementary_Data1_Dive_Track.xlsxThis is an Excel version of Supplementary Table 1, which lists on-bottom position data of the DSV Limiting Factor dive#123. Explanations for data acquisition is described in Supplementary Note 1 in the Supplementary Information .Supplementary_Data2_PD2022_MBES.grdThis file is a bathymetric grid data around the dive#123 site, formatted by GMT netCDF grid format (binary). The data were acquired by DSSV Pressure Drop in Sep. 2022, and used to draw the 2022 bathymetric map (Fig. 3a) and cross section (Fig. 3d). This file covers a region with longitudes ranging from 143°E to 144°E, and latitudes ranging from 38°N to 39°N. For information on data acquisition, please refer to the Method section of the main article. The file was generated by the nearneighbor command of GMT 6.4 with a grid interval (-I parameter) of 0.75 minute (=140 m) and a search radius (-R) of 0.25 km.Supplementary_Data3_ Fault-bend fold.xlsxThis Excel file contains a worksheet which calculated rotation of the surface slope and the underlying beds in response to change in the fault dip, following the kink geometry presented by Suppe (1983). The results were used to draw the balanced cross sections in Fug. 7 of the main article and Supplementary Figure 2. This spread sheet consists of two parts: Columns A to D (C1 to C4) on the left comprises a panel for calculation, methods of which are described in the worksheet. Columns E to N (C5 to C14) show the result of the calculation for the cases of varying dip angles of the thrust fault assuming 30°, 35°, 40°, and 45°. In each case, dip angles of the rotated surface slope and of the fold axial plane as a result of change in the fault dip angle were calculated sector by sector, and are shown in the green columns.Suppe, J. Geometry and kinematics of fault-bend folding. American Journal of Science 283, 684–721 (1983).Supplementary_Data4_ Critical_Taper.xlsmThis Excel file contains two worksheets which calculated critical slope angles for the post-seismic and pre-seismic wedge geometry. It was used to draw Supplementary Figure 4 and to assume the frictional properties shown in Supplementary Table 4. Note that this file contains in-house macro program coded by Visual Basic Application to execute calculations following Dahlen (1984). The codes can be seen using Visual Basic Editor embedded in the Excel software. Results of sector-by-sector critical slope angles are listed in a small table on the right in each worksheet. The post-seismic worksheet also shows rotation of surface slope angles in response to change in the decollement dip. The rotation was calculated as the same way with Supplementary File 2.Dahlen, F. A. Noncohesive critical Coulomb wedges: An exact solution. Journal of Geophysical Research 89, 10125-10133 (1984).Ueda_etal_Japan_Trench_Supplementary_Information.pdfThis is the same file as that provided from the journal site as the Supplementary Information.