MWZ - Strong Motion Vs BB - comparison enquiry
Closed this issue · 2 comments
MWZ strong motion vs BB station instrumentations shows discrepancies over a few periods
events as 2020p578726 or 2020p332789 are not relevant for comparison
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List of events of interest
Enquire on 2020p480708 M4.9 (June 26) M5 2020p877108 (November 20) "~Close and M>5 "
Source: Found in Jess s archive (/M_5/HN_HH/spectral_diff_figs/
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Isolate if new issue arises and confirmed - andf Check over time and events
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Some discrepancies in the PGA measures BB Vs SM
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Close Events are deep - PGA are relatively small
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Pretty Similar PGV and PSA values whether broadband ot Strong motion derived.
as in event https://www.geonet.org.nz/earthquake/technical/2020p877108
<station code="MWZ" name="MWZ" netid="NZ" insttype="CMG-3ES | <station code="MWZ" name="MWZ" netid="NZ" insttype="FBA-ES-
<comp name="10.HHE"> | <comp name="21.HNE">
<acc value="0.0190037842" flag="0"/> | <acc value="0.0315965025" flag="0"/>
<vel value="0.0098505423" flag="0"/> | <vel value="0.0112607822" flag="0"/>
<psa03 value="0.0389111310" flag="0"/> | <psa03 value="0.0374327296" flag="0"/>
<psa10 value="0.0158798289" flag="0"/> | <psa10 value="0.0156407395" flag="0"/>
<psa30 value="0.0016790727" flag="0"/> | <psa30 value="0.0016322399" flag="0"/>
</comp> </comp>
<comp name="10.HHN"> | <comp name="21.HNN">
<acc value="0.0147913790" flag="0"/> | <acc value="0.0270401913" flag="0"/>
<vel value="0.0084836261" flag="0"/> | <vel value="0.0098948070" flag="0"/>
<psa03 value="0.0217556314" flag="0"/> | <psa03 value="0.0298586980" flag="0"/>
<psa10 value="0.0112616010" flag="0"/> | <psa10 value="0.0120955998" flag="0"/>
<psa30 value="0.0014069534" flag="0"/> | <psa30 value="0.0014836777" flag="0"/>
</comp> </comp>
<comp name="10.HHZ"> | <comp name="21.HNZ">
<acc value="0.0196288268" flag="0"/> | <acc value="0.0280989366" flag="0"/>
<vel value="0.0092678665" flag="0"/> | <vel value="0.0092719176" flag="0"/>
<psa03 value="0.0271926279" flag="0"/> | <psa03 value="0.0283981317" flag="0"/>
<psa10 value="0.0145067851" flag="0"/> | <psa10 value="0.0148599090" flag="0"/>
<psa30 value="0.0007866412" flag="0"/> | <psa30 value="0.0007429837" flag="0"/>
</comp> </comp>
</station> </station>
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Z components are very similar PSA
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Horizontal components are different above ~4Hz
"Noise" contribution ? -
- Propose solution / fix /Actions
Site effect on the horizontal ? Components slightl;y off between both instruments in 2020 ?
Close and relevant Events took for this station are often deep (so mostly above ~~vertical location)
Would need to enquire about shallow local and M>4.5 events. if any issues arises clearly -
- Document
I don't reckon there is a critical or major issue. - to my "quick" check up
can be complemented by others ...
- Any other further questions enquiries ?