Access
of Guerrero data
By
following the link to Chronological Table of All
Accelerograms , you will open a file that contains (or will soon
contain) links to all data gathered by the Guerrero accelerograph network since
1985. Should you use these data, we
request that you cite the following paper which describes the Guerrero network:
Anderson, J. G., J. N. Brune, J. Prince, R. Quaas,
S. K. Singh, D. Almora, P. Bodin, M. Onate, R. Vazquez and J. M. Velasco
(1994). The Guerrero accelerograph
network, Geofisica Internacional 33, No. 3, 341-371.
We
also request that you cite the appropriate data report, many of which are
posted on this web site.
The
Chronological
Table of All Accelerograms is a spreadsheet created by
Microsoft Excel. Once you have
downloaded the table onto your computer, it will be possible for you to sort it
according to your interest.
The
table is sorted in chronological order.
The first column links you to an accelerogram in the format used
uniformly for Mexican strong motion data.
This has a very complete, informative header. Most of the rest of the columns in the Chronological Table of All
Accelerograms,
including magnitude and location of the earthquake, contain data
drawn from this header.
The
second column links you to the same accelerogram in what we call a
“Matlab-friendly format”. This is a
data file which can be loaded into Matlab (e.g. “load ATYC8509191.dat”),
yielding a matrix with dimension (n x
4), where n is the number of data. The
first column is the time after trigger time, the second is the acceleration in
the east direction, the third is acceleration in the north direction, and the
fourth is acceleration in the up direction.
1. (A) Link
to data in original Mexican format
2. (B) Link
to data in Matlab-friendly format, as described above.
3. (C)
Station code
4. (D) Event
time: year
5. (E) Month
6. (F) Day
7. (G) Hour
8. (H)
Minute
9. (I)
Second
10. (J) Station latitude
11. (K)
Station longitude
12. (L) Event
depth
13. (M) Event
magnitude (generally from Mexican seismic network)
14. (N) Event
latitude
15. (O) Event
longitude
16. (P)
Station trigger time: hour
17. (Q)
Minute
18. (R)
Second
19. (S) Record
statistics: sample rate (per second)
20. (T)
Number of samples
21. (U)
Duration of the seismogram
22. (V) Peak
acceleration: east
23. (W) Peak
acceleration: north
24. (X) Peak
acceleration: up
Note: the following parameters are
determined automatically by the program and in most cases are not reviewed.
They are advisory only.
25. (Y) SA
(absolute acceleration, 5% damping, 0.2 s period): east
26. (Z) SA
(absolute acceleration, 5% damping, 0.2 s period): north
27. (AA) SA (absolute
acceleration, 5% damping, 0.2 s period): up
28. (AB) SA
(absolute acceleration, 5% damping, 1.0 s period): east
29. (AC) SA
(absolute acceleration, 5% damping, 1.0 s period): north
30. (AD) SA
(absolute acceleration, 5% damping, 1.0 s period): up
31. (AE) Epicentral
distance, or 25 km if the earthquake is not located
32. (AF) ML,
assuming above epicentral distance
33. (AG). Ignore
34. (AH) P-wave arrival time on the record,
relative to start time. Set to zero if start of phase is not recorded.
35. (AI) S-wave
arrival time on the record, relative to start time.
36. (AJ)
Completeness code.
1=complete P and S wave.
2=trigger misses the start of the P-wave. S-wave is complete.
3=start of S-wave is not recorded, but peak of S-wave
probably is recorded.
4=Not clear if S-wave is complete enough to recover peak
acceleration. Also assigned to
seismograms with low amplitude, where the discretization of the
analog-to-digital converter is obvious, implying that the uncertainty in the
peak acceleration in the S-wave is large compared to the digitization interval.