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stressb.doc
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1989-03-24
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GEOPHYSICS OF NORTH AMERICA - STRESS DATA stressb.doc
This directory contains the DNAG stress display file which was created
from stress data which were obtained from Mary Lou Zoback at the USGS in
Menlo Park. The display file is binary. The entire data set is contained
in one display file.
DISPLAY FILE:
The name of the data file is NASTRESS.DAT. It is a binary file and each
record is 14 bytes long. The record contains the following information:
Latitude: 4 byte float
Longitude: 4 byte float (0 to 360 positive east)
Quality: 1 character
Type of Measurement: 1 character
Character Type
A BO = Breakouts
B FM(A) = Average of focal mechanism
C FM(C) = Composite focal mechanism
D FM(S) = Single focal mechanism
E G-FS = Geologic - fault slip
F G-VA = Geologic - volcanic alignment
dikes and cinder cones
G IS-FJ = In-Situ - flat jack
H IS-HF = In-Situ - hydrofrac
I IS-OC = In-Situ - overcore
J IS-PC = In-Situ - petal center core
L M = mixed indicators
Stress Azimuth: 2 byte integer (SHmax orientation measured
clockwise from North)
Line_number: 2 byte integer reference to the archive file
The program liststr (on the accompanying diskette) reads the stress
data file and outputs the data to standard output.