TITLE:
High-Precision Structural Map of Southeast Cameroon Using Phase Filters on Potential Gravimetric Data
AUTHORS:
Nzeuga Alain Rodrigue, Bisse Salomon Bertrant, Amaya Adama, Kenfack Fokem Alpha Baster, Ngah Christian Gislain Leonel, Ndjounguep Juscar, Nanfa Tefak Fatoumata Maelle, Ngoumou Paul Claude, Assembe Stéphane Patrick, Pokam Kengni Serge Hugues
KEYWORDS:
Gravimetry, Potential Field Data, Edge Detection, Structural Mapping, Southeast Cameroon
JOURNAL NAME:
Open Journal of Earthquake Research,
Vol.11 No.4,
November
25,
2022
ABSTRACT: The south-east of Cameroon encompasses a wide variety of geological structures among which we can cite the Congo Craton
(CC), the Sanaga Fault (SF),
the Yaoundé Domain, the Panafrican belt, the Protozoic series and the Dja
complex. The presence of all these structures justifies the great tectonic
activity to which this area was subject from the rupture of Pangea to the creation
of the different plates that exist today. In this work, we will bring out a high-resolution structural map of the study area by applying the
qualitative analysis of the phase filters on 200,900 points of gravimetric data obtained from the combination of the XGM2016 and ETOPO1 models.
Then, with these same data, we will bring out another structural map
with the maxima method called Multi-Scale Horizontal Derivative of Vertical Derivative
(MSHDVD) which will be compared to the
first in order to show the limits of the MSHDVD method. To do this, we will first use the extension
method to highlight the map of residual anomalies, then a combination of derivative, gradient and
phase filters to highlight the geological structures
responsible for fracturing in this area.
Phase filters have the advantage that they make it possible to highlight all the geological edges responsible for the fracturing without taking into account the depth, while the MSHDVD method
highlights the existing geological contacts
(edges) at depths well defined by the examiner. The structural map obtained with the MSHDVD method shows that the major structural direction in this zone is W-E while that obtained from
the interpretation of the phase filters is more precise and shows that
the major structural direction in this area would be N-S and this result would
be in perfect agreement with the tectonics of East Cameroon.