RIZ issue with broadband vs. accelerometer comparison #85
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Here are the events used for the above measurements: '2012p553582', '2012p595069', '2012p647755', '2012p681111', |
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RIZ is Raoul island Remotely accessble stations
b. Nov2020 to Feb 2021 for the events -Assumptions: Actions
Confirm output difference between Weak and strong |
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There is an - obvious- PSA/PGA difference in 2020 by RIZ Raoul island between HH/HN See belpw (no need to compare the PSAs Ratio is ~time 4 Event 2020p498617 event 2020p979274 GLKZ | RIZ HH psa computation shows consistent PSA values in scale Event 2020p498617 |
Obsidian datalogger related ? FYI @SquirrelKnight @elidana WIP |
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and a consistent 1/4 ratio as identified by jesse between HH and BN on RIZ until a n strong motion issue along 2018 until a replacement in 2019 sept Need to check if the HH Vs BN/HN ratio is still 4 in 2021 (after a Weak inst visit as 2020 Nov 10th) event Sep 2021 2021p715493 M5.1 and August 2021 2021p638513 M 5.5 |
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Results for 2021p715493 M5.5 GLKZ and RIZ Weak consistent output ~1-2%g Vs RIZ strong motion 0.3%g
Check on event 2021p876265 <100Kmdistance M5.7 depth 30km OT 2021-11-21T05:12:29Z As shown Below There is a PGA ratio in the measure netween MMKS and RIZ strong motion ---------- RIZ strong, Bias confirmed |
Perhaps to be communicated into a delta meeting |
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Summary most likely scenarios (today)
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Output: TO BE compared to MMKS strong for the same event about the same place for instance:cf #85 (comment) Results are consistent and makes sense - I don t think more checking is required from my side
FYI @elidana @mnaguit @SquirrelKnight ...almost there ... :) |
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@SquirrelKnight |
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That is wonderful to hear. Thank you for all of the hard work!
…On Wed, Feb 16, 2022 at 12:55 PM Jerome Salichon ***@***.***> wrote:
@SquirrelKnight <https://github.com/SquirrelKnight>
This instrument related issue will be addressed soon while patching the
metadata.
it will encompass a series of sites as per GeoNet/tickets#9943
<https://github.com/GeoNet/tickets/issues/9943>
over identified period of times. (related to Obsidian datalogger 4X
response)
cheers
FYI @elidana <https://github.com/elidana> @mnaguit
<https://github.com/mnaguit>
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PR was merged correction applied today @SquirrelKnight |
Re-open if additional issues |
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Jesse Hutchinson (University of Canterbury) has identified an issue with RIZ seismic data when comparing data from the broadband and strong motion sensors installed at the station.
His procedure is explained in #84 (comment)
processed Power Spectral Amplitude plots show a consistent difference between RINZ strong motion and broadband data for earthquakes with M>5 in the time period 2019-2020
It is likely that this difference is due to one of the sensors going flat during that time period. Further investigations to confirm the cause are needed.
/cc @SquirrelKnight, to help pinpoint time period and possible cause, can you please post here the list of events used to produce this figure?
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