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GeoNet_CMT_solutions.csv Update CMT list 2018p691168 Sep 16, 2018
README.md Update README.md (#25) Nov 8, 2017

README.md

Moment Tensors

The moment tensor solution describes the source mechanism of an earthquake - the geometry of how the fault ruptured in the earthquake.

Once the required broadband seismometers were deployed, GeoNet has been able to compute moment tensor solutions for earthquakes since August 2003 for moderate (magnitude >4) earthquakes. These are not currently integrated with QuakeML output from the earthquake catalogue. At the moment these are computed manually and the csv is updated shortly afterwards.

Fields Description
EVENT_ID CUSP/SeisComP3 event ID
Date yyyymmddhhmm00
Latitude/Longitude epicentre latitude and longitude
strike1/dip1/rake1 strike/dip/rake of nodal plane 1
strike2/dip2/rake2 strike/dip/rake of nodal plane 2
ML local magnitude
Mw moment magnitude
Mo seismic moment (dyne.cm)
CD centroid depth (km)
NS number of stations used to calculate solution
DC percent double-couple
Mxx, Mxy, Mxz, Myy, Myz, Mzz moment tensor elements - scale 1E20 dyne.cm
VR percent variance reduction for solution
Tva, Tpl, Taz value, plunge and azimuth for tension axis
Nva, Npl, Naz value, plunge and azimuth for null axis
Pva, Ppl, Paz value plunge and azimuth for compression axis.

Notes:

  • Moment tensor element scale is 1E20 dyne.cm, i.e. moment tensor elements need to be multiplied by 1E20 to convert to dyne.cm.
  • The Dusky Sound (20090715092200) earthquake is the USGS W-phase solution as a reliable regional moment tensor solution could not be calculated.
  • The Kaikoura (20161113110200) earthquake is the USGS W-phase solution as a reliable regional moment tensor solution could not be calculated.
  • Event ID's with 9999999 are events for which no event ID is currently available.
  • Beginning 5 September 2012 event ID/location/ML come from SeisComP3
  • n/a values are for solutions from external agencies where the parameters were not available.