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eq.doc
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1989-03-24
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GEOPHYSICS OF NORTH AMERICA - SEISMICITY DATA eq.doc
This directory contains the DNAG seismicity display files. The display
files are binary. The entire data set was regionalized into 33 regions,
each with a limit of 3000 events. The boundaries and number of events in
each region are:
Minimum Minimum Maximum Maximum
Longitude Latitude Longitude Latitude Number
0 260.4 13.6 265.4 34.6 3023
1 244.4 32.0 250.8 37.8 3016
2 228.4 32.0 238.2 43.6 2996
3 260.4 0.0 276.0 13.6 3004
4 170.0 51.6 199.2 90.0 3004
5 170.0 0.0 228.4 51.6 2982
6 244.4 37.8 250.8 47.6 2985
7 241.4 34.2 243.4 36.4 2980
8 228.4 0.0 260.4 32.0 2942
9 265.4 13.6 268.0 16.2 2949
10 208.0 61.6 210.8 65.2 2985
11 199.2 51.6 208.0 60.0 2945
12 208.0 51.6 218.8 61.6 2903
13 238.2 32.0 241.4 36.0 2917
14 243.4 32.0 244.4 33.8 2769
15 238.2 36.0 239.6 51.6 2752
16 228.4 43.6 238.2 51.6 2708
17 241.0 36.0 241.4 37.6 2644
18 241.4 32.0 243.4 34.2 2583
19 276.0 0.0 350.0 90.0 2367
20 218.8 51.6 276.0 90.0 2255
21 239.6 36.0 241.0 51.6 2247
22 268.0 13.6 276.0 51.6 2230
23 210.8 61.6 218.8 72.3 2122
24 243.4 33.8 244.4 51.6 1836
25 199.2 60.0 208.0 90.0 1786
26 241.4 36.4 243.4 51.6 1268
27 241.0 37.6 241.4 51.6 1263
28 265.4 16.2 268.0 51.6 775
29 208.0 65.2 210.8 90.0 621
30 250.8 32.0 260.4 51.6 339
31 244.4 47.6 250.8 51.6 114
32 260.4 34.6 265.4 51.6 64
DISPLAY FILES:
The names of the data files are EQ.NUM where NUM is the number of the region
covered by that file. Each Data file contains 24 bytes for each event. The
numbers contained in each record are:
Date: 8 bytes in days from January 1, 1980
Latitude (East) and longitude: 4 bytes each
Magnitude: 4 bytes
Line Number: (long int) 4 bytes
The magnitude listed is the one selected by Engdahl as the best. The
line number is a reference to the archive file. The events in the files are
sorted chronologically (and by line number).
The program listeq (on the accompanying diskette) reads the earthquake
data files and outputs the data to standard output.