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Project IDA (International Deployment of Accelerometers) Project IDA II GSN Calibration Procedures November 16, 2011 Peter Davis Project IDA Scripps Institution of Oceanography University of California, San Diego

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II GSN Calibration Procedures November 16, 2011 Peter Davis Project IDA Scripps Institution of Oceanography University of California, San Diego. Review timing and waveform quality:. sample rate correction. Sensor failure:. loss of vacuum. Getting the metadata right …. - PowerPoint PPT Presentation

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Project IDA (International Deployment of Accelerometers)Project IDA

II GSN CalibrationProcedures

November 16, 2011

Peter DavisProject IDA

Scripps Institution of OceanographyUniversity of California, San Diego

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sample rate correction

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Sensor failure:

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loss of vacuum

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Getting the metadata right…

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Traditional calibration procedures verified the DAS sensitivity and measured shape of system response.

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DC Calibration Test

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Convolve model of sensor response with input

Compare observed output with model

Iterate until fit acceptable

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Random binary test determines shape of response curve within 1%

Step input to digitizer determines sensitivity to > 0.1%

Manufacturer provides value of sensor generator constant to within 1%

What these tests measure:

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Random binary test determines shape of response curve within 1%

Pitfall – capturing the input signal, test only ‘snapshot’

Step input to digitizer determines sensitivity to > 0.1%

Pitfall – compensate for system load

Manufacturer provides value of sensor generator constant to within 1%

Pitfall – not verified

What these tests measure:

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Sumatra-Andaman earthquake excited many low frequency normal modes

Figure from Park et al. (2004), courtesy G. Roult

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Portable sensors used to check sensitivity of permanent sensors:

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Relative performance of GSN as a network Pitfall – no measure of absolute sensitivity Pitfall – accuracy limited by mode coupling Pitfall – need a very large earthquake to excite the

mode to observable amplitude

What this test measures:

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Tides are a continuous, constant signal Tidal amplitudes can be predicted to 1% accuracy

globally Tides are observed at all times at most GSN

stations Pitfall – must include effects of ocean

loading Pitfall – horizontal sensors effected too

strongly by local tilts Pitfall – tidal periods outside band of seismic

interest

Why use tides?

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Accurate determination of relative response of the common instruments

Accurate determination of relative orientation

What comparing co-located broadband sensors measures:

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Select data from common time period:

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Correct for modeled response:

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