Data Format

PNG File

Peak Ground Velocity (PGV):

Pixel size is 7.5 arc-seconds in latitude and 11.25 arc-seconds in longitude (approx. 250m x 250m).
Small dots and large diamond indicate strong-motion seismograph stations and an epicenter, respectively.
Basemap is generated by SRTM3 (C) NASA

GeoTIFF Files

Peak Ground Acceleration (PGA):

Channel number: 1
 Data type: 8-bit unsigned integer
 Unit: DN(compensated digital number), PGA(cm/s/s)=10**(0.011858*DN+0.289172)
 Invalid values: 0 (less than 2 cm/s/s), 255 (null)
 Pixel size: 7.5 arc-seconds in latitude and 11.25 arc-seconds in longitude
(approx. 250m x 250m)
 Datum: JGD2000

Peak Ground Velocity (PGV):

Channel number: 1
Data type: 8-bit unsigned integer
Unit: DN(compensated digital number), PGV(cm/s)=10**(0.011677*DN-0.710647)
Invalid values: 0 (less than 0.2 cm/s), 255 (null)
Pixel size: 7.5 arc-seconds in latitude and 11.25 arc-seconds in longitude (approx. 250m x 250m)
Datum: JGD2000

JMA Instrumental Seismic Intensity (INT):

Channel number: 1
Data type: 8-bit unsigned integer
Unit: DN(compensated digital number), INT=0.025692*DN+0.474308
Invalid values: 0 (less than 0.5), 255 (null)
Pixel size: 7.5 arc-seconds in latitude and 11.25 arc-seconds in longitude (approx. 250m x 250m)
Datum: JGD2000

Text File

Acceleration Response (SA):

File unit: 7.5 arc-seconds in latitude and 11.25 arc-seconds in longitude (approx. 250m x 250m) grid cell
Data type: CSV text
Value order: period (s), value of surface ground (cm/s/s), value of base ground (cm/s/s), amplification factor

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