Station MetadataThe NRL

(Nominal Response Library)

Dr. Mary TempletonIRIS Data Management Center

Managing Data from Seismic NetworksSeptember 9-17 2015

Hanoi, Vietnam

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

What is the NRL?

Includes 66 sensor models (14 manufacturers) 48 datalogger models (11 manufacturers) 11700 RESP files (97% are datalogger)

Constantly growing

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

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)

How Can You Use the NRL?

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

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

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

What Does the NRL Still Need? Contact Mary Templeton

met@iris.washington.edu