1. Seismograms in SEED format can be retrieved from multiple
data centers:
http://www.iris.washington.edu/manuals/netdc/netdc_user.htm
, via "view processing queue WILBER II":
http://www.iris.washington.edu/cgi-bin/wilberII_page1.pl
or
http://www.iris.edu/data/WebRequest.htm. then transform them
from SEED to DB DATASCOPE format, and store them.
2. Program Fmt4Db uses rdseed program to create AH bin files
from all of seed volumes (directory SeedVols , files *.seed) and
puts these AH bin files into working directory “work”. Program rdseed
is placed in /opt/fmt/bin directory. The text file
</opt/fmt/bin/fmtRdseed.initial> contains information
for Fmt4Db program. Using this file Fmt4Db creates temporary file for
rdseed
program providing AH bin files extraction from rdseed volume.
Such
program design allows working with AH bin files directly. Make sure
that
last extension name of each file is “AH” (for example
“1997.288.00.16.45.8310.IU.WVT.01.LHN.AH” or ”WVT.LHZ.AH”, or “1.AH”).
If you work with the files those not created with the program rdseed,
do not use file names containing more than 5 dots. It is recommended to
use 'rdseed'
standard name format:
yyyy.ddd.hhh.mm.ss.ffff.NNN.SSSSS.LLL.CCC.Q.AH
(See
http://www.iris.edu/manuals/rdseed.htm).
Here yyyy is the year, ddd is the Julian day, hh.mm.ss.ffff is the time
of day of the start of the first record, SSSSS is the station name, and
CCC is
the component name for the particular seismogram being
recovered, NNN is Network codes, LLL is Location identifiers, Q is
specify data type ( E - Everything, D - Data of undeteminated state, R
- Raw waveform data, Q - Quality controlled data, some processes have
been aplyed to the data).
3. Program allows decimating of time series to 1 sample per
second and to 1 sample per 10 seconds. The decimate rate must be a
multiple of the product of 2,4,5.
The program allows to keep the original sampling.
4. Network codes are assigned by the FDSN archive (IRIS DMC) to
provide uniqueness to seismological data streams.
Look at
http://www.iris.washington.edu/FDSN/networks.txt (permanent)
and
http://www.iris.washington.edu/FDSN/networks.portable.txt (temporary).
5. In 1998, the DMC started to use location identifiers to
identify uniquely a data stream among many data streams for the same
channel id and station id.
EXAMPLES: 1997.288.00.16.45.8310.IU.WVT.00.LHN.AH and
1997.288.00.16.45.8310.IU.WVT.10.LHN.AH means there are two different
instruments at the ANMO sight that use the BHZ
channel designation.
(For more information about how location identifiers are applied,
please read
this DMC Electronic Newsletter article.
http://www.iris.washington.edu/newsletter/vol1no1/page1.htm)
If a station does not use location identifiers, the file name will look
something like this: 1997.288.00.16.45.8310.IU.WVT..LHN.AH. For
instance if you have an STS-1 and STS-2 BHZ channel the location id
could be:
00 for the STS-1 (primary stream)
10 for the STS-2 ( the secondary stream)
20 for other sensors, etc
6. More details concerning IRIS (Data Sources, Request Methods,
Manuals, Software, Services etc.) can be found in
http://www.iris.washington.edu/HTM/manuals.htm.