I have some subsurface locations of earthquakes in UTM format (x,y,z). I need to convert those to latitude-longitude-depth format. Can anyone recommend any tool or code for doing that?
Take a look at http://www.windreader.com/geodesy/other_functions.htm
It is an open source set of functions to deal with basic geodesy, including lat/long to utm and vice-versa. Written in Delphi.