Dear all,
I have a gravity anomaly map, Bouguer and terrain corrected, from which I wish to estimate the crustal thickness. Is there a standard formula with which I could do this? (Given an assumed density for the crust). Anomaly is in mgal.
Thanks in advance!
Robin
For the modeling of the crustal-thickness we
used the straight equation -H (km.) = -31.85 -
((0.1291 * Boug) +( 0.0002089 * Boug2)) of
Assumpção, et al. (2013). Calculations were
performed in txt. and Excel. The equation that
produces the values in excess of the order of
~XXXX meters with relation to the global values
which can be extracted from CRUST 1.0 A New
Global Crustal Model at 1x1 Degrees: http://igppweb.
ucsd.edu/~gabi/crust1.html#visualization
(Access in 03/2016).
Tectonophysics, 609: 82-96.
http://bgi.omp.obs-mip.fr/activities/Projects/
world_gravity_map_wgm
Dear Robin …….we applied many equations to estimate the Crustal thickness of the Earth in Iraq using Bouguer gravity values. These equations and our obtained equation were summarized in table one in our paper entitled "Crustal thickness map of Iraq deduced from gravity data", that published at 1994.....some of these equations are T(km)= 33- 0.055 g(mgal) (Worzel and Shurbet 1955), T(km)= 32- 0.08g (mgal)(Woollard 1959) . A Crustal modeling that depends upon Seismological data was used to constrain the gravity models. We hope you will success to achieve your study…good luck. Prof. Ahmed S. Al-Banna
I think computing the Crustal thickness by gravity data with acceptable accuracy is almost intricate. There are many manuscripts in this case. I hope these articles be useful.
There is no standard formula to estimate crustal thickness. Gravity data must be interpreted from the surface down utilizing all available constraints. Geology is quite variable from location to location and an equation for crustal thickness that is good in one location is bad in another, because crustal thickness is only part of the total interpretation.
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