Juan and Alan,
I'll add to that the study of scarp degradation in oceanic crustal rocks
found in Tucholke et al., Geology, 1997, and work by J. Getsiv et al.,
presented in her M.S. Thesis at Vanderbilt and in a couple of AGU abstracts
in Spring 1998 and Fall 1999.
-Marty Kleinrock
1998 Getsiv, J.E., J.S. Noller, and M.C. Kleinrock, Preliminary Analysis
of Mass-Wasting at the TAG site, 26°; on the Mid-Atlantic Ridge, Eos,
Trans. Am. Geop. U., Spring Meeting, 79, S339, 1998.
At 6:14 AM -0600 3/15/02, Alan Roberts wrote:
>Juan
>
>Have you considered that for submarine scarps the diffusion equation may not
>always be appropriate, because the fault-block crest may fail by
>gravity-induced slumping (cf landslides) rather than just time-dependent
>erosion. Thus the failure could be much faster than the diffusion equation
>might predict.
>
>There is a developing volume of documentation on this mechanism of
>fault-block failure in the North Sea literature, can I recommend to start
>with:
>Underhill et al, AAPG Bulletin, 1997
>Hesthammer et al, Petroleum Geoscience 1999
>Berger & Roberts, Petroleum Geology of NW Europe 5 (eds Fleet & Boldy) 1999
>McLeod & Underhill, Petroleum Geology of NW Europe 5 (eds Fleet & Boldy)
>1999
>
>I hope this helps
>Alan Roberts
>
>----- Original Message -----
>From: "Juan I. Soto" <[log in to unmask]>
>To: <[log in to unmask]>
>Sent: Friday, March 15, 2002 11:45 AM
>Subject: fault-scarp degradation rates
>
>
>Dear all,
>
>I'm currently analyzing submarine linear scarps mostly controlled by
>recent high-angle normal faults. As we can also reconstruct the 3D
>geometry of these faults, I would like to estimate the age of any of
>the faults by comparing their attitude with the present scarp
>profile. The theoretical basis of this analysis is well known and
>scarp degradation is usually modeled on the basis of the diffusion
>equation (e.g. Culling 1960; Kirby 1971; Hanks et al. 1984;
>Arrowsmith et al. 1996; among many others).
>
>I would like to know if any of you knows a reliable estimate of the
>diffusion coefficient in other natural fault scarps, preferentially
>when fault scarp of known age occurs in unconsolidated sediments.
>Does any one know other examples of this problem in where the
>influence of the lithology (e.g. grain size) and the orientation of
>the scarp with respect to the regional landscape slope have been
>analyzed ?
>
>Thanking you in advance for the information. All the best,
>
>Juan Soto
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