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ENVIRONMENT

Lists the geological and physical environment details of collection points.

FILES

  • classes.csv - Site Class Descriptions.

  • constituents.csv - Constituents Descriptions.

  • features.csv - Sensor Installation Descriptions.

  • gauges.csv - Gauges Descriptions.

  • placenames.csv - Placename Descriptions.

  • visibility.csv - Sky View Descriptions.

CLASSES

Site classes as used for earthquake engineering applications and studies, for more details please see:

Kaiser, A., Van Houtte, C., Perrin, N., Wotherspoon, L., & McVerry, G. (2017). Site characterisation of GeoNet stations for the New Zealand Strong Motion Database. Bulletin of the New Zealand Society for Earthquake Engineering, 50(1), 39–49. https://doi.org/10.5459/bnzsee.50.1.39-49

Field Description
Station Station Code used to identify where the site class has been described
Site Class Site class as defined by NZS1170, ranges between A and E
Vs30 The time-averaged shear-wave velocity to 30m depth in meters per second
Vs30 Quality A quality estimate of the Vs30 estimate, ranges from Q1 to Q3
Tsite The low-strain fundamental site period in seconds, a range can be given as a prefix (e.g. < or >)
Tsite Method An indication of the method used to estimate Tsite
Tsite Quality A quality estimate of the Tsite estimate, ranges from Q1 to Q3
Basement Depth Estimated depth to the basement layer in meters, this may also be estimated as the depth to 1000 meters per second.
Depth Quality A quality estimate of the depth to basement, ranges from Q1 to Q3
Link A reference link to another site
Citations A semicolon separated list of reference citations for the site class estimates
Notes Extra notes which should be avoided in lieu of a better machine readable field

For reference the NZS1170.5 site classes are roughly

Class Description
A Strong Rock
B Rock
C Shallow Soil
D Deep or Soft Soil
E Very Soft Soil

Quality estimates are roughly

Quality Description
Q1 < 10 %
Q2 10 - 20 %
Q3 > 20 %

CONSTITUENTS

Field Description
Gauge Code used to uniquely identify Tide Gauge Station
Number Constituent number, used mainly for display and sorting
Constituent Standard Constituent Name
Amplitude Analysis Amplitude, in cm
Lag Analysis Phase Lag, in degrees
Start Date General date and time at which the Constituent description was valid.
End Date General date and time at which the Constituent description was no longer valid.

FEATURES

Field Description
Station Code used to uniquely identify Recording Station.
Location Code used to uniquely identify the Site at the Recording Station.
Sublocation Code used to uniquely identify the Site Sublocation if applicable.
Property Property being measured.
Description A helpful description of the physical site location.
Aspect Additional description of the physical site location, if applicable.
Start Date General date and time at which the Site description was valid.
End Date General date and time at which the Site description was no longer valid.

GAUGES

Field Description
Gauge Code used to uniquely identify Tide Gauge Stations
Network Code used to group Tide Gauge Stations together by project or operator
Identification Number For the tsunami gauges, this is a code used by LINZ, for the DART stations, this is the WMO number.
Analysis Time Zone Time-zone offset used in the Tidal Constituent Analysis
Analysis Latitude Latitude used in the Tidal Constituent Analysis, usually positive
Analysis Longitude Longitude used in the Tidal Constituent Analysis
Crex Tag Tide gauge Crex format location
Start Date General date and time at which the Gauge description was valid.
End Date General date and time at which the Gauge description was no longer valid.

PLACENAMES

Field Description
Name The name of the place to use for distance measurements.
Latitude The latitude of the place.
Longitude The longitude of the place, this should be within -180 to 180 degrees.
Level The level is used to discard small places when finding the closest place at large distances.

The level should be from 0 to 3, with 3 used for the smallest places.

VISIBILITY

Field Description
Code Code to uniquely identify GNSS Mark (or recording Station)
Sky Visibility Free form description of the site sky visibility and obstructions
Start Date General date and time at which the visibility was accurate
End Date General date and time at which the visibility was no longer accurate

CHECKS

Pre-commit checks will be made on these files to ensure:

  • No duplicated gauges - these need to be globally unique

NOTES

Dates should be given as in ISO 8601 (i.e. 2016-09-18T02:24:26Z), future dates should be given in the form: 9999-01-01T00:00:00Z.