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Information compiled by Dr. Caroline Holden (GNS)

Mw 5.7 FEBRUARY 14th EARTHQUAKE

General scientific info on the Mw 5.7 February 14th earthquake:

GeoNet info: (Link 1,Link 2)

PGA shakemap:

 

The “ShakeMap” above shows the shaking intensity as determined by GeoNet instruments and modelled against ground conditions (Horspool et al., 2015). This map is preliminary and people are advised to use actual recorded data if possible. The map is based on the ground motion prediction equation of Bradley (2013). The Vs30 grid has a spatial resolution of 100 m and is based on an assigned average velocity for 8 soil classes which was developed by Nick Perrin and Dave Heron (Perrin et al., 2015) based on geological maps of NZ (QMAP data, GNS Science). ShakeMap takes observed ground motions, and uses the ground motion prediction equation and Vs30 grid to interpolate predicted ground motions (PGA, PGV, MMI) onto a uniform grid. Queries should be directed to Nick Horspool (GNS).

Reference:

  • N.A. Horspool, M. Chadwick, J. Ristau, J. Salichon & M.C. Gerstenberger – ShakeMapNZ: Informing post-event decision making – NZSEE 2015 Annual technical conference, Rotorua New Zealand. Paper O-40
  • Perrin N., D. Heron, A., Kaiser and C. Van Houtte – Vs30 and NZS1170.5 site class map of New Zealand – NZSEE 2015 Annual technical conference, Rotorua New Zealand. Paper O-07

Downloading strong motion data:

Stations: Link to interactive map of stations below. (“Double-click” on a green square OR a red circle to get site-specific info)

Strong Motion Data

General info on GeoNet Strong-Motion data can be found here

Info on GeoNet accelerogram data files can be found here

Info on GeoNet response spectra data files can be found here

To convert GeoNet data into CSV format (Jim Cousins, GNS Science): csv_conversion_programs.zip

List of peak ground acceleration values:

ftp://ftp.geonet.org.nz/strong/processed/Proc/2016/02_Feb/2016-02-14_001343/20160214_001343.CSV

ACCELERATION data and plots (unfiltered):

ftp://ftp.geonet.org.nz/strong/processed/Proc/2016/02_Feb/2016-02-14_001343/Vol1/

ACCELERATION, VELOCITY, DISPLACEMENT data and plots (filtered 0.25 – 24.5 Hz)  :

ftp://ftp.geonet.org.nz/strong/processed/Proc/2016/02_Feb/2016-02-14_001343/Vol2/

RESPONSE SPECTRA data and plots( filtered 0.25 – 24.5 Hz) :

ftp://ftp.geonet.org.nz/strong/processed/Proc/2016/02_Feb/2016-02-14_001343/Vol3/

Response Spectra collated by anticipated site class at each GeoNet Station (Developed by Drs. Quincy Ma and Liam Wotherspoon at the University of Auckland)





Other useful links

Instrumented buildings with seismic sensors:

http://info.geonet.org.nz/display/appdata/Structural+Array+Data