DSZ - Strong Motion Vs BB - comparison enquiry

[salichon]

DSZ strong motion vs BB station instrumentations show some discrepancies during period 2010-2020

• Current reposne information is avaialble here: https://service.geonet.org.nz/fdsnws/station/1/query?station=DSZ&level=response&channel=HNZ,HHZ Sensor FBA-ES-T and sesnor had location code change

• [ ] - Inspect the events when HN/HH ratio is not looking right Most of the discrpancies are over 2020 Both signal HH and HN do not seem to provide seismic signal well recorded. When seismic signal HH and HN are ok and comparable.

assumptions: 2020 range of events that are not recorded at DSZ hence no relevant comparison (low magnitude or great distance). and/or joint instrumental issue

• [x] - List of events required Found in Jess s archive (/M_5/HN_HH/spectral_diff_figs/)

  
  focus on 2020
  good: 2020p434252 2020p595479 2020p877108
  Bad : M>5 2020p327457 2020p770963 2020p802150
  Other numerous M<5 (for later) 

- [x]  Check over time and events 

M>5 2020p327457  DSZ is in the South island event is ..several thousands km away ...
https://www.geonet.org.nz/earthquake/2020p327457 
and 
2020p770963
https://www.geonet.org.nz/earthquake/2020p770963
or 
https://www.geonet.org.nz/earthquake/2020p651160
or 
.https://www.geonet.org.nz/earthquake/2020p802150
Another "local" https://www.geonet.org.nz/earthquake/2020p450618 (M<5 up north island 

>> most likely **events are not relevant to be used for strong motion parameter and not suitable for comparison**   

- [ ]  Isolate if new issue arises and confirmed

- [x] - Propose solution / fix / Actions
All good 

- [ ] - Document 

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 FYI @SquirrelKnight @elidana