Data

Download Available Files

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 programatic access from custom pieces of software.

Full hazard curve data is also available for download.

File Contents	Spectral Acceleration	Return Period	Downloads
Ground Motion	Peak Ground Acceleration	10% in 50 Years	[ TEXT \| BINARY ]
Ground Motion	Peak Ground Acceleration	2% in 50 Years	[ TEXT \| BINARY ]
Ground Motion	Peak Ground Acceleration	5% in 50 Years	[ TEXT \| BINARY ]
Ground Motion	0.1 Second (10Hz)	10% in 50 Years	[ TEXT \| BINARY ]
Ground Motion	0.1 Second (10Hz)	2% in 50 Years	[ TEXT \| BINARY ]
Ground Motion	0.1 Second (10Hz)	5% in 50 Years	[ TEXT \| BINARY ]
Ground Motion	0.2 Second (5Hz)	10% in 50 Years	[ TEXT \| BINARY ]
Ground Motion	0.2 Second (5Hz)	2% in 50 Years	[ TEXT \| BINARY ]
Ground Motion	0.2 Second (5Hz)	5% in 50 Years	[ TEXT \| BINARY ]
Ground Motion	0.3 Second (3.33Hz)	10% in 50 Years	[ TEXT \| BINARY ]
Ground Motion	0.3 Second (3.33Hz)	2% in 50 Years	[ TEXT \| BINARY ]
Ground Motion	0.3 Second (3.33Hz)	5% in 50 Years	[ TEXT \| BINARY ]
Ground Motion	0.5 Second (2Hz)	10% in 50 Years	[ TEXT \| BINARY ]
Ground Motion	0.5 Second (2Hz)	2% in 50 Years	[ TEXT \| BINARY ]
Ground Motion	0.5 Second (2Hz)	5% in 50 Years	[ TEXT \| BINARY ]
Ground Motion	1.0 Second (1Hz)	10% in 50 Years	[ TEXT \| BINARY ]
Ground Motion	1.0 Second (1Hz)	2% in 50 Years	[ TEXT \| BINARY ]
Ground Motion	1.0 Second (1Hz)	5% in 50 Years	[ TEXT \| BINARY ]
Ground Motion	2.0 Second (0.5Hz)	10% in 50 Years	[ TEXT \| BINARY ]
Ground Motion	2.0 Second (0.5Hz)	2% in 50 Years	[ TEXT \| BINARY ]
Ground Motion	2.0 Second (0.5Hz)	5% in 50 Years	[ TEXT \| BINARY ]

Click a file header to re-sort table listing by that column.

More About File Formats

Text File Formats
These files are simple white-space delimited files. The format should be fairly easy to decipher without much guidance.

Binary File Formats
These files were created from the text files and have the same format. In order to help with programatic reading of these files there is additional header information at the top of these files. Header information contains:

FileType (int) 0 → Hazard Curve File 1 → Ground Motion File
Minimum Latitude (double)
Maximum Latitude (double)
Minimum Longitude (double)
Maximum Longitude (double)
Grid Spacing (double) The decimal degree increment between adjacent latitudes/longitudes
Num Curve Points (int) The number of points per hazard curve. This value is only present in hazard curve files.

For convenience we provide sample binary file readers for potential developers to examine the source and get a better idea of how to read the file format. Download our reader (requires Java™). To use this application, open a command line terminal and type: java -jar AKParser.jar <datafile>.