Closed salichon closed 10 months ago
Task/Check list for investigation
[x] interpret the issue reported ( e.g. Amplitude Diff between BB and SM waveforms)
inspecting figures oper events per staiton as provided par jessie: in gm_compare-1\M_5\HN_HH\wf_figs
Checked for events of interest (lot of noise and few good data)
[x] isolate periods of questioning for the period mentioned in that ticket
[x] Check event 2019p927023 waveform parameters (MRZ ~300 km away) https://strongmotion.geonet.org.nz/#/event/2019p927023
>
> <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
> <!DOCTYPE earthquake SYSTEM "stationlist.dtd"> <!DOCTYPE earthquake SYSTEM "stationlist.dtd">
> <stationlist created="" xmlns="ch.ethz.sed.shakemap.usgs.xml" <stationlist created="" xmlns="ch.ethz.sed.shakemap.usgs.xml"
> <station code="MRZ" name="MRZ" netid="NZ" insttype="CMG-3ES | <station code="MRZ" name="MRZ" netid="NZ" insttype="FBA-ES-
> <comp name="10.HHE"> | <comp name="21.HNE">
> <acc value="0.0336222543" flag="0"/> | <acc value="0.0279376229" flag="0"/>
> <vel value="0.0171557611" flag="0"/> | <vel value="0.0118713551" flag="0"/>
> <psa03 value="0.1252890259" flag="0"/> | <psa03 value="0.0579332028" flag="0"/>
> <psa10 value="0.0072364425" flag="0"/> | <psa10 value="0.0078426039" flag="0"/>
> <psa30 value="0.0011547390" flag="0"/> | <psa30 value="0.0018025627" flag="0"/>
> </comp> </comp>
> <comp name="10.HHN"> | <comp name="21.HNN">
> <acc value="0.0261324049" flag="0"/> | <acc value="0.0400683587" flag="0"/>
> <vel value="0.0121421276" flag="0"/> | <vel value="0.0174330617" flag="0"/>
> <psa03 value="0.0735810139" flag="0"/> | <psa03 value="0.1192592514" flag="0"/>
> <psa10 value="0.0084328539" flag="0"/> | <psa10 value="0.0078407303" flag="0"/>
> <psa30 value="0.0008719387" flag="0"/> | <psa30 value="0.0014621644" flag="0"/>
> </comp> </comp>
> <comp name="10.HHZ"> | <comp name="21.HNZ">
> <acc value="0.0127150652" flag="0"/> | <acc value="0.0173768548" flag="0"/>
> <vel value="0.0075368465" flag="0"/> | <vel value="0.0387199230" flag="0"/>
> <psa03 value="0.0368886509" flag="0"/> | <psa03 value="0.0362138030" flag="0"/>
> <psa10 value="0.0059454713" flag="0"/> | <psa10 value="0.0060438004" flag="0"/>
> <psa30 value="0.0012763991" flag="0"/> | <psa30 value="0.0018354591" flag="0"/>
> </comp> </comp>
> </station> </station>
> </stationlist> </stationlist>
[x] Check polarities for cusp events as in MRZ | 20 | reversed | 2003-07-31T00:00:00Z to 2011-04-13T00:00:00Z OLD
2020 M4.7 Levin (2020p802823)
PGA estimates
PGA (HNE) = 0.019081, PGA (HNN) = 0.028269, PGA (HNZ) = 0.012876 m/s/s
PGA (HNE) = 0.001946, PGA (HNN) = 0.002883, PGA (HNZ) = 0.001313 g
PGA (HHE) = -0.019427, PGA (HHN) = 0.011166, PGA (HHZ) = 0.009958 m/s/s
PGA (HHE) = -0.001981, PGA (HHN) = 0.001139, PGA (HHZ) = 0.001015 g
Acc subplots
Vel subplots
2020 M4.6 Whakatane (2020p464185)
PGA estimates
PGA (HNE) = -0.003669, PGA (HNN) = 0.003887, PGA (HNZ) = 0.001751 m/s/s
PGA (HNE) = -0.000374, PGA (HNN) = 0.000396, PGA (HNZ) = 0.000179 g
PGA (HHE) = 0.003156, PGA (HHN) = -0.002764, PGA (HHZ) = 0.001142 m/s/s
PGA (HHE) = 0.000322, PGA (HHN) = -0.000282, PGA (HHZ) = 0.000116 g
Acc subplots
Vel subplots
Discussion summary (as of Oct 2, 2023
)
2003 to 2011
(this is captured in polarities.csv
, which is good!)polarities.csv
which may not probably give a heads up to users not familiar with delta) BOTTOMLINE:
WHAT'S NEXT:
@Thomas-Benson @mnaguit
Even better about the "polarities.csv"
of MRZ these polarities are well accounted for
(we may need to review the definition of polarities (i forgot that bit see below from Mark)
when we know 100% that the channel is reversed, this is related to hardware. e.g. an STS-2 connected to a Q4120 will be reversed.
The polarities is for when we don't expect it to be reversed but for some reason it is (wrong connection, bad cable etc).
"polarities.csv"
Thanks @Thomas-Benson for pointing that out ! well done - a No PB for that period.
This doesn't really contribute that much, but I was testing some scripts for PSA calculations and plotting and wanted to put something here.
Example with 2019p927023 which Jerome has done above:
Testing with the March 2021 7.2 East Cape quake 2021p169083 at distance 524Km for a slighly larger epicentral distance.
Acceleration waveforms look OK:
PSA plots:
I get good PSA values for both the Strong motion and broadband sensors, which also matches up fairly well with the values available on the strong motion page for the event | SM | BB | GeoNet strong motion tool (HN) |
---|---|---|---|
HNE PSA0.3: PSA 0.151885 | HHE PSA0.3: PSA 0.166159 | 0.152314 | |
HNE PSA1.0: PSA 0.03727 | HHE PSA1.0: PSA 0.041462 | 0.0391874 | |
HNE PSA3.0: PSA 0.006473 | HHE PSA3.0: PSA 0.006867 | 0.00626706 | |
HNN PSA0.3: PSA 0.162689 | HHN PSA0.3: PSA 0.172862 | 0.17351 | |
HNN PSA1.0: PSA 0.045646 | HHN PSA1.0: PSA 0.039204 | 0.0474634 | |
HNN PSA3.0: PSA 0.006985 | HHN PSA3.0: PSA 0.006272 | 0.00659691 | |
HNZ PSA0.3: PSA 0.059772 | HHZ PSA0.3: PSA 0.064563 | 0.0629257 | |
HNZ PSA1.0: PSA 0.023733 | HHZ PSA1.0: PSA 0.022504 | 0.0272351 | |
HNZ PSA3.0: PSA 0.004603 | HHZ PSA3.0: PSA 0.004533 | 0.00459017 |
As of 10 October 2023
MRZ HN/HH waveforms derived from instruments have differences:
[x] List of events of interest polarity check evid 2498995 and 2376455 amplitudes 2020p802823 2020p464185 other possible 2020p434252 2020p877108 2020p947812 2020p972758 other events were not recording relevant data. (source too far) checked: https://www.geonet.org.nz/earthquake/technical/2019p927023
[ ] Isolate if new issues arise and are confirmed
[ ] Propose solution / fix /Actions
[ ] Document