Determining the effective elastic thickness through cross-correlation between isostatic disturbances  

作　　者：Nelson Ribeiro-Filho Cristiano Mendel Martins Raissa Moraes Baldez Ivaldevingles Rodrigues de Souza Júnior Franck Eitel Kemgang Ghomsi 

机构地区：[1]Instituto Federal do Pará(IFPA),Altamira,Pará,Brazil [2]Universidade Federal do Pará(UFPA),Belem,Pará,Brazil [3]Nansen-Tutu Center for Marine Environmental Research,Department of Oceanography,University of Cape Town,South Africa [4]Geodesy Research Laboratory,National Institute of Cartography,Yaounde,Cameroon

出　　处：《Geodesy and Geodynamics》2024年第3期241-251,共11页大地测量与地球动力学（英文版）

摘　　要：The elastic thickness parameter was estimated using the mobile correlation technique between the observed isostatic disturbance and the gravity disturbance calculated through direct gravimetric modeling. We computed the vertical flexure value of the crust for a specific elastic thickness using a given topographic dataset. The gravity disturbance due to the topography was determined after the calculation. A grid of values for the elastic thickness parameter was generated. Then, a moving correlation was performed between the observed gravity data(representing actual surface data) and the calculated data from the forward modeling. The optimum elastic thickness of the particular point corresponded to the highest correlation coefficient. The methodology was tested on synthetic data and showed that the synthetic depth closely matched the original depth, including the elastic thickness value. To validate the results, the described procedure was applied to a real dataset from the Barreirinhas Basin, situated in the northeastern region of Brazil. The results show that the obtained crustal depth is highly correlated with the depth from known models. Additionally, we noted that the elastic thickness behaves as expected, decreasing from the continent towards the ocean. Based on the results, this method has the potential to be employed as a direct estimate of crustal depth and elastic thickness for any region.

关 键 词：ISOSTASY Elastic thickness Isostatic disturbance Moho depth CROSS-CORRELATION 

分 类 号：P223[天文地球—大地测量学与测量工程] P542[天文地球—测绘科学与技术]