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Managing Data from Seismic Networks with NRL Metadata

Learn about the Nominal Response Library (NRL) for seismic instruments - includes sensor and datalogger models, how it's constructed, use cases, updates, and how to help improve the NRL. Contact Dr. Mary Templeton for more information.

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Managing Data from Seismic Networks with NRL Metadata

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  1. Station MetadataThe NRL(Nominal Response Library) Dr. Mary Templeton IRIS Data Management Center Managing Data from Seismic Networks September 9-17 2015 Hanoi, Vietnam

  2. What is the NRL? • Library of manufacturers’ recommended nominal instrument responses • SEED RESP files • Help matching an instrument’s configuration with the correct response • Notes describing instrument and response differences

  3. What is the NRL? • Includes • 66 sensor models (14 manufacturers) • 48 datalogger models (11 manufacturers) • 11700 RESP files (97% are datalogger) • Constantly growing

  4. How is the NRL Constructed? • Response information from manufacturer • Instruction file links instrument configuration with pole/zero or FIR coefficient files • Generate RESP files from instruction file • Accuracy checking

  5. How Can You Use the NRL? • Web version (http://ds.iris.edu/NRL/) • Follow links for manufacturer and model • Notes are at the top • Table helps locate the correct RESP file • Example: STS-2 sensors (http://ds.iris.edu/NRL/sensors/streckeisen/streckeisen_sts2_sensors.htm)

  6. How Can You Use the NRL?

  7. How Can You Use the NRL? • Copy PDCC from a memory stick • In PDCC: • Select a channel • Launch “Select Instrumentation” • Download latest version of the Library (but not this week!) • PDCC checks the IRIS website for NRL changes • Answer questions to find the correct responses

  8. How Can You Use the NRL? • Update your Nominal Response if: • you have calibration info • your accelerometer full scale voltage and/or clip level differs • you have a passive sensor and • your resistors differ • you need to take sensor-amplifier impedance into account • You’ve set a software gain on your datalogger

  9. Two Things You Need To Know • If you change a stage gain, you must recalculate the final (stage 0) gain • The final (stage 0) normalization frequency must lie within the passband of the response curve: passband

  10. What Does the NRL Still Need? • Contact Mary Templeton • met@iris.washington.edu

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