Using the AmaSeis seismogram viewer and downloading - QuarkNet

Using AmaSeis… Page 30 of 69
3.11 Manually setting the AmaSeis sample rate: The analog to digital circuit (digitizer) in
the AS-1 seismometer does not have a fixed sample interval. It normally samples at about 6
samples per second and that is the default sample rate set by the AmaSeis software when
AmaSeis is opened to view or analyze seismic data and an AS-1 is not connected to your
computer. Because this default value (6 samples per second) is not always the actual sample
rate, it is possible to manually set the sample rate to be closer to the rate that was used in
actually recording the data. For example, for the WLIN AS-1 data (either the continuous, 24hour
records such as in the 2003 folder or the SAC format files of individual seismograms), the
rate is close to 6.14 samples per second. To manually set the sample rate, use MS Word to open
the file AS1.ini from the AmaSeis folder. This is a text file that stores information about your
AS-1 and AmaSeis set up. The text file will be similar to the following:
[MRU]
Count=4
[AS1]
Latitude=40.484
Longitude=86.881
Elevation=205
BAUD=2400
COM=1
Gain=60
Component=Z
StationName=WLIN
StationCode=WLIN
FileExtension=LPZ
LinesPerHour=1
DecimateFactor=1
DaysToRetainRecords=2000
LowPassCutoff=3
ZeroLevel=2048
InitSampleSeconds=5
SampleRate=6
BandPassLowCutoff=0.01
BandPassHighCutoff=0.2
Device=AS1
Notice that the sample rate in this file (fourth line from the bottom) is the default value of 6. To
manually set the sample rate, change this number to the appropriate value (such as 6.14) and
save it (using the file name AS1.ini) as a plain text file in the AmaSeis folder. The Save As
dialog box in MS Word should look like that shown in Figure 36. Note that the file name is
AS1.ini and the file type is Plain Text (near the bottom of the dialog box). When this updated
file is saved, a dialog box will appear (Figure 37) that requests information about text encoding;
click on the MS-DOS selection as shown in Figure 37 and then click OK to complete the save
of the AS1.ini file with the updated sample rate information.