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MLZ BB Vs SM investigation #118

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11 tasks
salichon opened this issue Oct 10, 2023 · 6 comments
Open
11 tasks

MLZ BB Vs SM investigation #118

salichon opened this issue Oct 10, 2023 · 6 comments
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@salichon @mnaguit @Thomas-Benson
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@salichon
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Task/Check list for investigation

  • 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)

  • isolate periods of questioning for the period mentioned in that ticket

    • Check event

    • Check polarities for cusp events as in

  • Compare Raw waveforms Horizontals and Vertical in velocity and acceleration for given reference events and periods
  • Compare waveforms removed form instrument reposnse on Horizontals and Vertical in velocity and acceleration for given reference events and periods
  • Check if all components are consistent with each other (Horizontal Vs Vertical)
  • Check PGA values for events of reference over time periods for both instruments
  • Check additional waveform parameters if required
@salichon salichon mentioned this issue Oct 10, 2023
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@mnaguit
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mnaguit commented Oct 13, 2023

Checking these end user files
Event 1: https://www.geonet.org.nz/earthquake/technical/2020p938679
wf_fig_2020p938679_MLZ

Event 2: https://www.geonet.org.nz/earthquake/technical/2020p140742
wf_fig_2020p140742_MLZ

@mnaguit
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mnaguit commented Oct 13, 2023

Station metadata history

Strong motion

#Network | Station | Location | Channel | Latitude | Longitude | Elevation | Depth | Azimuth | Dip | SensorDescription | Scale | ScaleFreq | ScaleUnits | SampleRate | StartTime | EndTime
NZ|MLZ|20|HNE|-45.366544|168.118407|594.000000|0.000000|270.000000|0.000000|Accelerometer|427336.117780|1.000000|m/s**2|200.000000|2003-09-08T00:00:00|2014-03-25T00:00:00
NZ|MLZ|20|HNN|-45.366544|168.118407|594.000000|0.000000|180.000000|0.000000|Accelerometer|427336.117780|1.000000|m/s**2|200.000000|2003-09-08T00:00:00|2014-03-25T00:00:00
NZ|MLZ|20|HNZ|-45.366544|168.118407|594.000000|0.000000|0.000000|90.000000|Accelerometer|427336.117780|1.000000|m/s**2|200.000000|2003-09-08T00:00:00|2014-03-25T00:00:00
NZ|MLZ|21|HN1|-45.366530|168.118380|587.000000|0.000000|60.000000|0.000000|Accelerometer|427336.117780|1.000000|m/s**2|200.000000|2014-03-25T00:05:00|2019-10-31T21:33:00
NZ|MLZ|21|HN2|-45.366530|168.118380|587.000000|0.000000|150.000000|0.000000|Accelerometer|427336.117780|1.000000|m/s**2|200.000000|2014-03-25T00:05:00|2019-10-31T21:33:00
NZ|MLZ|21|HNZ|-45.366530|168.118380|587.000000|0.000000|0.000000|-90.000000|Accelerometer|427336.117780|1.000000|m/s**2|200.000000|2014-03-25T00:05:00|2019-10-31T21:33:00
NZ|MLZ|21|HNE|-45.366530|168.118380|587.000000|0.000000|90.000000|0.000000|Accelerometer|427336.117780|1.000000|m/s**2|200.000000|2019-10-31T21:34:00|
NZ|MLZ|21|HNN|-45.366530|168.118380|587.000000|0.000000|0.000000|0.000000|Accelerometer|427336.117780|1.000000|m/s**2|200.000000|2019-10-31T21:34:00|
NZ|MLZ|21|HNZ|-45.366530|168.118380|587.000000|0.000000|0.000000|-90.000000|Accelerometer|427336.117780|1.000000|m/s**2|200.000000|2019-10-31T21:34:00|

Broadband

#Network | Station | Location | Channel | Latitude | Longitude | Elevation | Depth | Azimuth | Dip | SensorDescription | Scale | ScaleFreq | ScaleUnits | SampleRate | StartTime | EndTime
NZ|MLZ|10|HHE|-45.366544|168.118407|594.000000|0.000000|90.000000|0.000000|Broadband Seismometer|838860800.000000|1.000000|m/s|100.000000|2003-09-08T00:00:00|2014-03-25T00:00:00
NZ|MLZ|10|HHN|-45.366544|168.118407|594.000000|0.000000|0.000000|0.000000|Broadband Seismometer|838860800.000000|1.000000|m/s|100.000000|2003-09-08T00:00:00|2014-03-25T00:00:00
NZ|MLZ|10|HHZ|-45.366544|168.118407|594.000000|0.000000|0.000000|-90.000000|Broadband Seismometer|838860800.000000|1.000000|m/s|100.000000|2003-09-08T00:00:00|2014-03-25T00:00:00
NZ|MLZ|10|HHE|-45.366544|168.118407|594.000000|0.000000|90.000000|0.000000|Broadband Seismometer|838860800.000000|1.000000|m/s|100.000000|2014-03-25T00:00:01|2021-06-08T00:40:00
NZ|MLZ|10|HHN|-45.366544|168.118407|594.000000|0.000000|0.000000|0.000000|Broadband Seismometer|838860800.000000|1.000000|m/s|100.000000|2014-03-25T00:00:01|2021-06-08T00:40:00
NZ|MLZ|10|HHZ|-45.366544|168.118407|594.000000|0.000000|0.000000|-90.000000|Broadband Seismometer|838860800.000000|1.000000|m/s|100.000000|2014-03-25T00:00:01|2021-06-08T00:40:00
NZ|MLZ|10|HHE|-45.366544|168.118407|594.000000|0.000000|90.000000|0.000000|Broadband Seismometer|504365056.000000|1.000000|m/s|100.000000|2021-06-08T04:19:00|2022-07-04T17:22:00
NZ|MLZ|10|HHN|-45.366544|168.118407|594.000000|0.000000|0.000000|0.000000|Broadband Seismometer|504365056.000000|1.000000|m/s|100.000000|2021-06-08T04:19:00|2022-07-04T17:22:00
NZ|MLZ|10|HHZ|-45.366544|168.118407|594.000000|0.000000|0.000000|-90.000000|Broadband Seismometer|504365056.000000|1.000000|m/s|100.000000|2021-06-08T04:19:00|2022-07-04T17:22:00
NZ|MLZ|10|HHE|-45.366544|168.118407|594.000000|0.000000|90.000000|0.000000|Broadband Seismometer|481000000.000000|1.000000|m/s|100.000000|2022-07-07T23:30:00|
NZ|MLZ|10|HHN|-45.366544|168.118407|594.000000|0.000000|0.000000|0.000000|Broadband Seismometer|481000000.000000|1.000000|m/s|100.000000|2022-07-07T23:30:00|
NZ|MLZ|10|HHZ|-45.366544|168.118407|594.000000|0.000000|0.000000|-90.000000|Broadband Seismometer|481000000.000000|1.000000|m/s|100.000000|2022-07-07T23:30:00|

@mnaguit
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mnaguit commented Oct 13, 2023 •
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2020 M5.6 Outside NZ (2020p938679)

PGA estimates

PGA (HNE) = -0.000197, PGA (HNN) = 0.000355, PGA (HNZ) = -0.000356 m/s/s 
PGA (HNE) = -0.000020, PGA (HNN) = 0.000036, PGA (HNZ) = -0.000036 g 
PGA (HHE) = 0.000052, PGA (HHN) = -0.000044, PGA (HHZ) = -0.000023 m/s/s 
PGA (HHE) = 0.000005, PGA (HHN) = -0.000004, PGA (HHZ) = -0.000002 g

Acc subplots
M5 6 OutsideNZ_2020p938679Acc

Vel subplots
M5 6 OutsideNZ_2020p938679Vel

@mnaguit
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mnaguit commented Oct 13, 2023 •
edited
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2020 M4.9 outside NZ (2020p140742)

PGA estimates

PGA (HNE) = -0.000111, PGA (HNN) = -0.000156, PGA (HNZ) = -0.000086 m/s/s 
PGA (HNE) = -0.000011, PGA (HNN) = -0.000016, PGA (HNZ) = -0.000009 g 
PGA (HHE) = 0.000075, PGA (HHN) = -0.000058, PGA (HHZ) = 0.000068 m/s/s 
PGA (HHE) = 0.000008, PGA (HHN) = -0.000006, PGA (HHZ) = 0.000007 g

Acc subplots
M4 9 OutsideNZ_2020p140742Acc

Vel subplots
M4 9 OutsideNZ_2020p140742VEL

@GeoGarfias
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I would like to know the conclusion of this investigation. Are the amplitudes comparable? Did you remove the instrument response of the strong motion data and integrate it to get the data to velocity?
Also, it seems that channels HN* had a high water level value applied when the instrument response was removed.

@Thomas-Benson
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Hi @GeoGarfias, @mnaguit and @salichon might be able to give a more complete answer than this once they are back in a few weeks time, but in the meantime I've had a look at a slightly clearer event (2020p475488) than the ones used above and the accelration amplitudes look reasonably comparable:


HNZ PSA0.3: 0.068504 m/s/s
HNZ PSA1.0: 0.06009 m/s/s
HNZ PSA3.0: 0.006577 m/s/s
HNZ PSA10.0: 0.001156 m/s/s
HNZ PSA15.0: 0.000386 m/s/s

HHZ PSA0.3: 0.067616 m/s/s
HHZ PSA1.0: 0.058467 m/s/s
HHZ PSA3.0: 0.006398 m/s/s
HHZ PSA10.0: 0.001126 m/s/s
HHZ PSA15.0: 0.000361 m/s/s

image

Looking at some work supplied by one of the NSHM researchers It appears there was some discrepancies in the period from 2014-2019 while one specific strong motion recorder was installed at the site, but this has now been corrected. Looking at this plot and the history of the site there might be an issue it might be an issue with polarity or sensor orientation, which we are aware was a problem with this installation
image

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@salichon @mnaguit @GeoGarfias @Thomas-Benson