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Volume 34, Issue 4
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Abstract

[

Maximum horizontal stress orientation () and the trend of fault lines (based on two different studies) in the Moatize Basin. There is a consistency between the trend of and fault lines in different parts of the study area that can explain the role of faults in localised perturbation of stress at basin scales.

, Abstract

This paper presents the first comprehensive analysis of the present‐day stress from boreholes near an active continental rifting zone in the Moatize Basin, Mozambique. The state of present‐day stress in this area that is located ca. 100 km away from the Eastern African Rift System (EARS) is poorly understood, and most of our knowledge is from earthquake focal mechanisms that provide stress information from the deeper part of the lithosphere, and to a lesser extent from surface geological features in the Malawi region. Considering the limited reliability of earthquake‐derived stress orientations near plate boundaries, poor coverage of low to moderate magnitude earthquakes in eastern Africa, and ambiguity about the latest activity of geological structure; other well‐established methods are required to shed light on the active tectonics of EARS. In this study, we analyse stress orientation using log data from 95 vertical boreholes in a mine site to investigate the neotectonic stress pattern of the region. Analysis of 17.9 km of televiewer logs resulted in interpretation of 1188 stress‐related borehole failures. The results indicate a mean regional trend of 045° ± 31° for the maximum horizontal stress (). Our investigation reveals that the regional state of stress in the study area is controlled by superposition of stress sources that act at very different spatial scales. The consistency between our results and predictions by plate‐scale geodynamic models of stress orientations confirm that the regional pattern of stress in this area is mainly controlled by first (>500 km) and second (distances between 500 and 100 km) order stress sources (i.e., large tectonic forces and lateral density variations). However, high‐resolution data used in this study reveal that third (between 100 and 1 km) and fourth (<1 km) order stress sources from stiffness contrasts, rock fabric and geological structures have a great impact on the stress perturbations at smaller and local scales.

]
Basin Research © 2022 John Wiley & Sons Ltd, European Association of Geoscientists & Engineers and International Association of Sedimentologists © 2022 The Authors. Basin Research published by International Association of Sedimentologists and European Association of Geoscientists and Engineers and John Wiley & Sons Ltd.
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2022-07-16
2024-04-20

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Characterising the contemporary stress orientations near an active continental rifting zone: A case study from the Moatize Basin, central Mozambique
Basin Research 34, 1292 (2022); https://doi.org/10.1111/bre.12660
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  • Article Type: Research Article
Keyword(s): acoustic televiewer; Eastern African Rift System; Mozambique; neotectonics; present‐day stress

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