Hi Allan, Do you mean depth as in 'the depth at which the fault occurs' or something else? Chris -------------------------------------------------- Dr Christopher Aiden-Lee Jackson Statoil Reader in Basin Analysis Department of Earth Science & Engineering Imperial College Prince Consort Road London SW7 2BP UK email: [log in to unmask]<mailto:[log in to unmask]> webpage: www.imperial.ac.uk/people/c.jackson<http://www.imperial.ac.uk/people/c.jackson> phone: +44(0)2075947450 On 5 Aug 2013, at 19:45, Allan Lopez wrote: Hi Everybody, Does any one knows about one empirical relationship to relate fault length to DEPTH for every type of fault ??. There are several parameters influencing the behaviour but I just need a crude relation or rule of thumb. I am working close to the Middle American subduction zone in Costa Rica Regards, Allan López Centro de Investigaciones en Ciencias Geológicas Universidad de Costa Rica