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<div>Does anyone know what earth model the distaz webservice uses to calculate distances (all I can tell is that it appears not to be a spherical earth model) </div>
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<div>Thanks </div>
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<div>Paul Denton</div>
<div>UK school seismology project leader</div>
<div>British Geological Survey</div>
<div>Keyworth </div>
<div>Nottingham NG12 5GG</div>
<div>email pdenton@bgs.ac.uk</div>
<div>web <a href="http://www.bgs.ac.uk/ssp">www.bgs.ac.uk/ssp</a></div>
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