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Additional file 1: Fig. S1. Average noise spectrum of the Hi-net tiltmeter records. Fig. S2. Magnitude maps of the three-component pre-P gravity signal. Fig. S3. Stacked waveforms of the horizontal NS component data and synthetics.

Additional file 1: Figure S1. Hi-net station distribution with the NIED DMC and the ETMC system in the Sagami Bay. Figure S2. K-NET and KiK-net station distribution with the NIED DMC, the sub DMC, and the ETMC system in the Sagami Bay. Figure S3. F-net station distribution with the NIED DMC. Figure S4. Offshore station distribution of S-net, DONET, and the ETMC system in the Sagami Bay with the NIED DMC and landing stations. Figure S5. V-net station distribution with the NIED DMC.

Additional file 1.  Figures showing (1) a diagram of instrumental responses, (2) acceleration waveforms of F-net broadband seismometers, and (3) an enlarged view of the stacked traces of F-net broadband seismometers and Hi-net tiltmeters data.

Additional file 2.  List of the 27 F-net stations used for the stacking.

Additional file 1. Comparison of the surface and borehole PGVs at the site IBUH03 for the mainshock and a small event.

Additional file 1. Estimation of corner frequencies.

Additional file 3. Comparison between weak-motion and strong-motion S-H/V spectral ratios at the KNG202, KNG204, KNG205, and KNG206 sites.

Additional file 1. Example of waveform recordings and Fourier amplitude spectra.

Additional file 2. Example plot of S-H/V spectral ratios for different groups of PGAs at the KNG201 site.

Additional file 4. Relationship between DNL values and PGAs at the OBS and land sites.

Additional file 2. Response ratios between the basin and rock sites for the mainshock.

Additional file 1. Velocity seismograms of the mainshock at different passbands.