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Hi Allan, If you mean fault aspect ratio (length/height), here are some indications for normal faults: typical values of the aspect ratio (length/height) expected for vertically unrestricted faults are around 2 (e.g. Soliva and Benedicto, 2005; Soliva et al., 2005). Significantly larger aspect ratios, up to a critical maximum value around 10, characterize vertically confined faults from the sedimentary succession to the crustal scale (e.g. Soliva et al., 2005, and references therein). You can get more details and related references from: GSA Bull. 125 (2013), 1239-1259, doi: 10.1130/B30814.1. Cheers Stefano On 06/ago/2013, at 02:45, 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 >