Open salichon opened 9 months ago
Checking these end user files Event 1: https://www.geonet.org.nz/earthquake/technical/2020p938679
Event 2: https://www.geonet.org.nz/earthquake/technical/2020p140742
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|
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
Vel subplots
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
Vel subplots
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.
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
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
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
Reversed Strong motion https://github.com/GeoNet/delta/blob/main/install/polarities.csv