Values of the peak amplitudes at the ShakeMap map grid nodes.
File is ASCII text in the following format:
First line is a header, space-delimited, with all of the following:
<name/CUSPID of event> <mag> <epicentral lat> <epicentral lon>
<MMM DD YYYY> <HH:MM:SS timezone>
<W bound> <S bound> <E bound> <N bound>
(Process time: <time>) <Location String>
The first 'time' field is the time of the event.
'Process time' is the time this file was last updated.
For large or historic earthquakes the "Location String" will
usually be the name of the earthquake, otherwise it will be
something of the form "12.1 mi. SSW of Carpinteria, CA"
The remaining lines are of the form:
<lon> <lat> <pga> <pgv> <mmi> <psa03> <psa10> <psa30>
pga = peak ground motion (acceleration, as percent of g)
pgv = peak ground motion (velocity in cm/s)
mmi = estimated instrumental intensity
psa03 = spectral acceleration at 0.3 s period, 5% damping (percent of g)
psa10 = spectral acceleration at 1.0 s period, 5% damping (percent of g)
psa30 = spectral acceleration at 3.0 s period, 5% damping (percent of g)