Wills Map
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2015 is the latest version that I am aware of. The supplementary data of the paper provides the map as a GIS shapfile (http://www.seismosoc.org/Publications/BSSA_html/bssa_105-6/2015105-esupp/index.html). I then rasterized it to a binary floating point file (which similar to the 2006 file, except with floats instead of short ints) using the gdal_rasterize command (http://www.gdal.org/gdal_rasterize.html).
The original and rasterized data is stored here on opensha.usc.edu:
/export/opensha-00/data/siteData/wills_2015
I suggest you use raster_0.00025.flt, which is rasterized with 0.00025 degree spacing (~25 meters). The raster_0.00025.hdr file contains the necessary coordinates for georeferencing it, but I'll summarize here:
The first location in the file is at:
x/longitude/ULXMAP = -124.406528862058
y/latitude/ULYMAP = 42.0090923024621
This is the upper left (northwest) point in the map.
numX/numLon/NCOLS = 41104
numY/numLat/NROWS = 37900
Grid spacing (both X and Y): 0.00025 degrees
Data type: 4-byte/32-bit little-endian floating point numbers
Mesh ordering: fast XY, so the first few points are:
Index 0 (at byte 0): -124.406528862058, 42.0090923024621
Index 1 (at byte 4): -124.406528862058+0.00025, 42.0090923024621 = -124.406278862058, 42.0090923024621
Index 2 (at byte 8): -124.406528862058+0.0005, 42.0090923024621 = -124.406028862058, 42.0090923024621
...
