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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hi,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Our group occasionally uses the autodrm (email) data request
system (when there appear to be problems with the web-based service).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I recently noticed that the emails in GSE format can contain
the wrong calibration value. An example for the station AU-PSA00 channel BHZ.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>BEGIN IMS1.0<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>MSG_TYPE DATA<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>MSG_ID 201211272145330004 USA_DMC<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>REF_ID 4699-AU-PSA00--Manual<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>DATA_TYPE WAVEFORM IMS1.0:CM6<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>TIME_STAMP 2012/11/27 21:45:33<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>WID2 2012/11/27 07:09:59.994 PSA00 BHZ 00
CM6 48001 40.000000 4.74e-02
20.000 UNKWN -1.0 0.0<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Note the values 4.72e-02 for the system sensitivity and
20.000 for the calibration reference period. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>According to the format specification these have the
following meaning:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:11.0pt;
font-family:Arial'>70–79 e10.2 system sensitivity (nm/count) at the
calibration reference period, the ground motion in nanometers per digital count
at calibration period (calper)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:11.0pt;
font-family:Arial'>81–87 f7.3 calibration
reference period; the period in seconds at which the system sensitivity is
valid; calper should be near the flat part of the response curve (in most
cases, 1 second<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>When I go to the channel web page on the IRIS site the sensitivity
gain is quoted as 3.358e9 cnts/(m/s) or 3.358 cnts/(nm/s).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>The same value is returned by a station metadata query to
the web service.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Converting the velocity response to displacement response: |Rd|
= omega_ref*|Rv| = 2*pi*0.05*3.358 = 1.055 cnts/nm<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>So the sensitivity at 20 seconds is 1/Rd = 0.948 nm/count
rather than 0.0474 in the WID2 line in the GSE message.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Looking at the noise level at the station it is also clear
that something like 0.948 is the correct value.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I note that the value in the WID2 line would be correct for
a reference period of 1 second.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Could someone at IRIS please look into this?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thanks, Marthijn de Kool<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<div Hazards1 and Monitoring>
<p class=MsoNormal><b><font size=2 color="#333333" face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:#333333;font-weight:bold'>Marthijn
de Kool <br>
</span></font></b><font size=2 color="#333333" face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:#333333'>Geophysicist | Nuclear
Monitoring | Earth Monitoring and Hazards</span></font><o:p></o:p></p>
<div>
<p class=MsoNormal><font size=2 color="#333333" face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:#333333'>Minerals and Natural
Hazards Division </span></font><b><font size=2 color="#333333"><span
style='font-size:10.0pt;color:#333333;font-weight:bold'>|</span></font></b><font
size=2 color="#333333"><span style='font-size:10.0pt;color:#333333'> </span></font><b><font
size=1 color="#333333" face=Arial><span style='font-size:9.0pt;font-family:
Arial;color:#333333;font-weight:bold'>GEOSCIENCE <st1:country-region w:st="on"><st1:place
w:st="on">AUSTRALIA</st1:place></st1:country-region></span></font></b><o:p></o:p></p>
</div>
<div style='margin-bottom:6.0pt'>
<p class=MsoNormal style='line-height:50%'><b><font size=2 color="#29627d"
face=Arial><span style='font-size:11.0pt;line-height:50%;font-family:Arial;
color:#29627D;font-weight:bold'>__________________________________________________</span></font></b><b><font
size=2 color="#943634" face=Arial><span style='font-size:11.0pt;line-height:
50%;font-family:Arial;color:#943634;font-weight:bold'>__________</span></font></b><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=1 color="#333333" face=Arial><span
style='font-size:9.0pt;font-family:Arial;color:#333333'>Phone: +61 2 6249
9656 Fax: +61 2 6249 9999</span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><font size=1 color="#333333" face=Arial><span
style='font-size:9.0pt;font-family:Arial;color:#333333'>Email: <a
href="mailto:Marthijn.DeKool@ga.gov.au" title="mailto:Marthijn.DeKool@ga.gov.au"><font
color="#333333"><span style='color:#333333;text-decoration:none'><span
title="mailto:Marthijn.DeKool@ga.gov.au">Marthijn.DeKool@ga.gov.au</span></span></font></a>
Web: <a href="http://www.ga.gov.au/" title="http://www.ga.gov.au/"><font
color="#333333"><span style='color:#333333;text-decoration:none'><span
title="http://www.ga.gov.au/">www.ga.gov.au</span></span></font></a></span></font><o:p></o:p></p>
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<div style='margin-top:6.0pt'>
<p class=MsoNormal><st1:Street w:st="on"><st1:address w:st="on"><font size=2
color="#333333" face=Arial><span style='font-size:10.0pt;font-family:Arial;
color:#333333'>Cnr Jerrabomberra Avenue</span></font></st1:address></st1:Street><font
size=2 color="#333333" face=Arial><span style='font-size:10.0pt;font-family:
Arial;color:#333333'> and <st1:Street w:st="on"><st1:address w:st="on">Hindmarsh
Drive</st1:address></st1:Street> Symonston ACT</span></font><o:p></o:p></p>
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<div style='margin-bottom:6.0pt'>
<p class=MsoNormal><font size=2 color="#333333" face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:#333333'>GPO Box 378 <st1:City
w:st="on">Canberra</st1:City> ACT 2601 <st1:country-region w:st="on"><st1:place
w:st="on">Australia</st1:place></st1:country-region></span></font><o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><b><font size=2 color="#333333" face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:#333333;font-weight:bold'>Applying
geoscience to <st1:country-region w:st="on"><st1:place w:st="on">Australia</st1:place></st1:country-region>’s
most important challenges</span></font></b><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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