Thread: correct instrument response of barometer data with US Array stations

Hi,

I am not sure if this is the right forum to post it, but can anyone
please direct me to a tutorial, etc on how to correct the instrument
response for barometers (Setra 278 and Quanterra 330 MEMS barometer)
available with the US Array stations?

Attached figure shows example ~10 days raw data at station TA.T38A.
Channel LDO is Setra 278 data and LDM is MEMS barometer data.

While instrument gain (10.0) information for LDM channel (
http://service.iris.edu/irisws/sacpz/1/query?net=TA&sta=T38A&loc=EP&cha=LDM&starttime=2011-05-09T20:30:00&endtime=2012-10-28T15:30:00
) corrects it to around 10^5 Pa or 1 atm so this looks correct, but
LDO channel data is around ~10^6 counts and there is no information
for gain correction here (
http://service.iris.edu/irisws/sacpz/1/query?net=TA&sta=T38A&loc=EP&cha=LDO&starttime=2011-05-09T20:30:00&endtime=2012-10-28T15:30:00
).

There is a document here (
http://www.usarray.org/files/docs/IRIS_Webservices_Atmospheric_Data_Supplemental_Tutorial.pdf
) that says there is ~80000 Pa offset between Setra and MEMS barometer
for low elevation stations, but even then I cannot reconcile the
numbers.

Thanks for your help !!

Regards,
Avinash

--

Avinash Nayak,
PhD Candidate,
Berkeley Seismological Laboratory,
Department of Earth and Planetary Science,
University of California, Berkeley


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