Epicentral Distance & Phase Travel Time Calculator

Enter the latitudes and longitudes using decimal degrees and negative numbers to represent West and South directions.

+90 latitude is N to -90 latitude is S of equator; +180 longitude is E to -180 longitude is W of prime meridian.  

The focal depth should be entered in km, where 0 = Surface Focus (do not enter negative values).

By: Tamara Cook - UWRF Geology Student (2013)