The location and mislocation of subcrustal earthquakes

Details The location and mislocation of subcrustal earthquakes The location and mislocation of subcrustal earthquakes

Sep 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978pepi...17p...1a&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 17, Issue 2, p. P1-P6.

Physics

1

Scientific paper

In regions, such as subduction zones, with systematic velocity variations from the travel-time model, the estimated hypocentres may be significantly mislocated and the estimated hypocentres may depend strongly on the stations and phases used. The estimated depths of earthquakes beneath the North Island, New Zealand, as determined by the International Seismological Centre and the New Zealand Seismological Observatory are used to illustrate this effect. Compared with ISC depths determined using local P phases only, the NZSO depths using local P and S phases are shallower by about 15 km while ISC depths using local and releseismic P phases are shallower again by about 30 km (and up to 70 km). Thus ISC depths which do not use teleseismic observations are not consistent with those which do and so care must be exercised when using both types of solution.

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