RespGen

We designed RespGen as a tool to allow instrument manufacturers and network operators to easily determine the instrument response of any seismograph. In 1994, Pavlis and Vernon published a paper, “Calibration of Seismometers Using Ground Noise“, claiming that if the instrument response of one of two co-located seismometers is known, we can restore the instrument response of the other. The new RespGen program is a highly refined version of the Pavlis and Vernon method.

Examples

GSN stations

Nearly every station in the GSN network has an STS-1 co-located on the same pier as an STS-2, Nanometrics Trillium 240 or another broadband sensor. Take, for example, the GSN station in Kyrgyzstan (http://www.iris.edu/mda/II/AAK). Given a single day’s worth of raw data from AAK.00 (STS-1) and AAK.10 (STS-2), RespGen is able to accurately determine the instrument response of AAK.10 from AAK.00:
LHZ-stage4

The blue line is the instrument response of the STS-2 according to Streckeisen. The green line is the instrument response for the STS-2 as we derived it with RespGen. Now that is a pretty good fit!

Getting the instrument response of an “unknown” sensor from another sensor with a “known” instrument response is now easy.

BRU2

OSOP owns and operates a world-class broadband seismic station called BRU2. The continuous data are shared publicly with IRIS (http://www.iris.edu/mda/PA/BRU2). In February, 2013 Branden set up 3 Nanometrics Trillium Compacts side-by-side to test some new software he was developing to implement the Sleeman method for determining self-noise levels. Here is what the setup looked like:

Co-located Nanometrics Trillium Compacts at BRU2, the OSOP seismic vault. Click on the image to enlarge.

Co-located Nanometrics Trillium Compacts at BRU2, the OSOP seismic vault. Click on the image to enlarge.

We then ran the data from two of these sensors through the RespGen program in order to determine the instrument response:
BHZ-stage4

The blue line is the instrument response of the Trillium Compact according to Nanometrics. The green line is the instrument response for the Trillium Compact as we derived it with RespGen.

SEND US YOUR DATA and we will send you back a RESP or dataless formatted response file!

Applications

  • Determining the instrument response of a new sensor
  • Confirming the instrument response you have calculated for a new sensor
  • Confirming the nominal instrument response provided by the instrument manufacturer is as advertised in the IRIS Nominal Response Library
  • Identifying mechanical failures
  • Identifying phase (polarity) and gain problems
  • Monitoring the instrument responses of seismic instrumentation in your network or pool of campaign instrumentation
  • Something a little more extreme: You just returned from a campaign study in the Aleutians. Your Nanometrics Trillium Compact was thrown from a helicopter, banged around in your backpack for a day, was attacked by bears while you cowered in your tent hoping your deodorant did not attract the cubs, then it sat around covered in a meter of slush for a few months only to then suffer through a weeks-long journey on the barge you hitchhiked back to the mainland on. Now you are back in the lab and you want to make sure things are OK.

Advantage over calibration table or coil

With the RespGen program, you can confirm the entire instrument response curve, including the sensitivity, high and low corner frequencies. But we also make a calibration table. Check it out here.

The Manual

Acknowledgements

Many thanks to Professor Pavlis for his guidance and our friend Adam Ringler at ASL for his readiness to answer our questions and talk instrumentation.

Need a Quote?

SEND US YOUR DATA and we will send you back a RESP or dataless formatted response file!

To inquire about the program, email us at [email protected]

Need more specs? Email us at [email protected].

Need another solution? Let us design it for you. Send your requirements to our technical team at [email protected]. OSOP leads software development projects in Python, C/C++, HTML5, Django, JQuery and Javascript for all supported software packages.

Related Links

See also: