Afghanistan Data

Data files are presented in two formats, text and binary. Both formats for a given file contain the same information. The text file is white-space delimited and can easily be imported into your favorite spreadsheet application (i.e. Microsoft Excel™) for further analysis. The binary format is more useful for programmatic access from custom software.

Download Individual Files

File Type Return Period Spectral Acceleration Download
Ground Motion 10% in 50 years 1Hz (1.0 Second) [ Binary (817 kB) | Text (1 Mb) ]
Ground Motion 2% in 50 years 1Hz (1.0 Second) [ Binary (817 kB) | Text (1 Mb) ]
Ground Motion 5% in 50 years 1Hz (1.0 Second) [ Binary (817 kB) | Text (1 Mb) ]
Ground Motion 10% in 50 years 5Hz (0.2 Second) [ Binary (817 kB) | Text (1 Mb) ]
Ground Motion 2% in 50 years 5Hz (0.2 Second) [ Binary (817 kB) | Text (1 Mb) ]
Ground Motion 5% in 50 years 5Hz (0.2 Second) [ Binary (817 kB) | Text (1 Mb) ]
Hazard Curve (AFD4) Not Applicable 5Hz (0.2 Second) [ Binary (2 Mb) | Text (6 Mb) ]
Hazard Curve (AFD4) Not Applicable 1Hz (1.0 Second) [ Binary (2 Mb) | Text (6 Mb) ]
Hazard Curve (AFD4) Not Applicable Peak Ground Acceleration [ Binary (2 Mb) | Text (6 Mb) ]
Hazard Curve (AFD5) Not Applicable 5Hz (0.2 Second) [ Binary (2 Mb) | Text (6 Mb) ]
Hazard Curve (AFD5) Not Applicable 1Hz (1.0 Second) [ Binary (2 Mb) | Text (6 Mb) ]
Hazard Curve (AFD5) Not Applicable Peak Ground Acceleration [ Binary (2 Mb) | Text (6 Mb) ]
Hazard Curve (AFDEEP) Not Applicable 5Hz (0.2 Second) [ Binary (2 Mb) | Text (6 Mb) ]
Hazard Curve (AFDEEP) Not Applicable 1Hz (1.0 Second) [ Binary (2 Mb) | Text (6 Mb) ]
Hazard Curve (AFDEEP) Not Applicable Peak Ground Acceleration [ Binary (2 Mb) | Text (6 Mb) ]
Hazard Curve (AFDEEPER) Not Applicable 5Hz (0.2 Second) [ Binary (2 Mb) | Text (6 Mb) ]
Hazard Curve (AFDEEPER) Not Applicable 1Hz (1.0 Second) [ Binary (2 Mb) | Text (6 Mb) ]
Hazard Curve (AFDEEPER) Not Applicable Peak Ground Acceleration [ Binary (2 Mb) | Text (6 Mb) ]
Hazard Curve (AFF_C_ASB) Not Applicable 5Hz (0.2 Second) [ Binary (2 Mb) | Text (6 Mb) ]
Hazard Curve (AFF_C_ASB) Not Applicable 1Hz (1.0 Second) [ Binary (2 Mb) | Text (6 Mb) ]
Hazard Curve (AFF_C_ASB) Not Applicable Peak Ground Acceleration [ Binary (2 Mb) | Text (6 Mb) ]
Hazard Curve (AFF_C_WUS) Not Applicable 5Hz (0.2 Second) [ Binary (2 Mb) | Text (6 Mb) ]
Hazard Curve (AFF_C_WUS) Not Applicable 1Hz (1.0 Second) [ Binary (2 Mb) | Text (6 Mb) ]
Hazard Curve (AFF_C_WUS) Not Applicable Peak Ground Acceleration [ Binary (2 Mb) | Text (6 Mb) ]
Hazard Curve (AFF_GR_ASB) Not Applicable 5Hz (0.2 Second) [ Binary (2 Mb) | Text (6 Mb) ]
Hazard Curve (AFF_GR_ASB) Not Applicable 1Hz (1.0 Second) [ Binary (2 Mb) | Text (6 Mb) ]
Hazard Curve (AFF_GR_ASB) Not Applicable Peak Ground Acceleration [ Binary (2 Mb) | Text (6 Mb) ]
Hazard Curve (AFF_GR_WUS) Not Applicable 5Hz (0.2 Second) [ Binary (2 Mb) | Text (6 Mb) ]
Hazard Curve (AFF_GR_WUS) Not Applicable 1Hz (1.0 Second) [ Binary (2 Mb) | Text (6 Mb) ]
Hazard Curve (AFF_GR_WUS) Not Applicable Peak Ground Acceleration [ Binary (2 Mb) | Text (6 Mb) ]
Hazard Curve (AFML75) Not Applicable 5Hz (0.2 Second) [ Binary (2 Mb) | Text (6 Mb) ]
Hazard Curve (AFML75) Not Applicable 1Hz (1.0 Second) [ Binary (2 Mb) | Text (6 Mb) ]
Hazard Curve (AFML75) Not Applicable Peak Ground Acceleration [ Binary (2 Mb) | Text (6 Mb) ]
Hazard Curve (AFML75) Not Applicable 5Hz (0.2 Second) [ Binary (2 Mb) | Text (6 Mb) ]
Hazard Curve (AFML75) Not Applicable 1Hz (1.0 Second) [ Binary (2 Mb) | Text (6 Mb) ]
Hazard Curve (AFML75) Not Applicable Peak Ground Acceleration [ Binary (2 Mb) | Text (6 Mb) ]
Ground Motion 10% in 50 years Peak Ground Acceleration [ Binary (817 kB) | Text (1 Mb) ]
Ground Motion 2% in 50 years Peak Ground Acceleration [ Binary (817 kB) | Text (1 Mb) ]
Ground Motion 5% in 50 years Peak Ground Acceleration [ Binary (817 kB) | Text (1 Mb) ]

About File Formats

Ground Motion Binary Files

Binary file downloads contain longitude, latitude, and ground motion (%g) values in that order. Each value is a binary “double” floating point number which occupies 8 bytes on disk. Data are gridded at 0.1° intervals between each location. The first entry in the data file represents the north-west corner of the data. Subsequent entries in the data file proceed first east and then south. The last entry in the data file represents the south-eash corner of the data.

Hazard Curve Binary Files

Binary file downloads contain header information with the following format:

  • 180 bytes (character data)
    Suggestion: Discard
  • 4 bytes (decimal data)
    Suggestion: Discard
  • 4 bytes (decimal data)
    Suggestion: Keep for later reference
  • 4 bytes * 20 (decimal data)
    Suggestion: Keep first “Num Level”, then discard
  • 4 bytes * 10 (mixed data)
    Suggestion: Discard

Following this header information begins the actual hazard curve data. Hazard curve data starts at the north-west corner of the gridded region working first east across longitudes and then south across latitudes with a 0.1° grid spacing between each point. Each grid point in the file contains “Num Levels” values, each corresponding, in order, to the “X-Values” from the header. Each value is 4-byte decimal data.

Ground Motion Text Files

Text file downloads contain longitude, latitude, and ground motion (%g) values in that order. Each value is separated by one or more white-space characters and there is one location per line. Data are gridded at 0.1° intervals between each location. The first line in the file represents the north-west corner of the data. Subsequent lines proceed first east and then south. The last line in the file represents the south-east corner of the data.

Hazard Curve Text Files

Text file downloads also start with header information similar to that which can be found in the binary files. The hazard curve data follows the header information with one geographic location per line. Each line starts with longitude and latitude indicating the lines geographic position. The subsequent values in the line correspond to the X-Values which can be read from the header information. Curve data starts in the north-west corner of the region moving first east along longitudes then south along latitues with a 0.1° grid spacing between each point.

Hazard Curve Types

  • Background seismicity (0-50 km depth), Ambrayseys and others ground motion relation.
  • Background seismicity (0-50 km depth), Western US ground motion relations.
  • Background seismicity (50-100 km depth), Young’s intraslab and Atkinson and Boore subduction zone attenuation relations.
  • Background seismicity (100-150 km depth), Young’s intraslab attenuation relation.
  • Background seismicity (150-200 km depth), Young’s intraslab attenuation relation.
  • Background seismicity (200-250 km depth), Young’s intraslab attenuation relation.
  • Fault sources, Characteristic behavior, Ambrayseys and others ground motion relation.
  • Fault sources, Characteristic behavior, Western US ground motion relations.
  • Fault sources, Gutenberg-Richter behavior, Ambrayseys and others ground motion relation.
  • Fault sources, Gutenberg-Richter behavior, Western US ground motion relations.