Detection of Crustal Deformation Using a Gravimetric and Multitemporal Interferometric SAR (MT-InSAR) Approach

IF 1.9 4区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

pure and applied geophysics Pub Date : 2025-04-11 DOI:10.1007/s00024-025-03715-0

Olagoke E. Daramola, Emeka E. Epuh, Chukwuma J. Okolie, Ikenna D. Arungwa, Ojima I. Apeh, Ahmed Fatoyinbo, Samuel Akinnusi, Michael J. Orji, Robert Tenzer

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引用次数: 0

Abstract

Gradual crustal deformation processes and deposition may lead to new formations within affected geologies and geomorphologies. This study investigates crustal deformation within the well-known Anambra Sedimentary Basin of Nigeria by exploring interferometric synthetic aperture radar (InSAR) data from the Sentinel-1 satellite mission and tailored gravity model, a high-resolution gravity model integrating satellite, terrestrial and topographic data for the basin. Derived gravity maps demonstrate varying fault mechanisms and reveal the existence of NE–SW and NW–SE trending faults which may have led to the Oligocene formation along the NW–SE fault trend. The InSAR displacement maps reveal subsidence and uplift rates up to 8.8 mm/year, and 7.7 mm/year, respectively. This observed deformation in the Anambra Basin is due to fault-related factors as the highest subsidence rate is found in Ebonyi State between the Abakaliki anticlinorium and the Afikpo syncline and the differential loading in basin formation boundaries. Land subsidence is found to happen in the Anambra metropolis where urban sprawl is centred. Increased groundwater levels in the basin have also helped to reduce subsidence rates. This study has provided insights into the possible factors contributing to crustal deformation in the Anambra Basin, informing policymakers towards effective urban planning and resource management, and possible artificial groundwater recharge.

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利用重力和多时相干涉SAR （MT-InSAR）方法探测地壳变形

逐渐的地壳变形过程和沉积可能在受影响的地质和地貌中形成新的地层。本研究通过探索Sentinel-1卫星任务的干涉合成孔径雷达（InSAR）数据和定制重力模型（一种集成了该盆地卫星、陆地和地形数据的高分辨率重力模型），研究了尼日利亚著名的Anambra沉积盆地的地壳变形。导出的重力图显示了不同的断裂机制，并揭示了NE-SW和NW-SE走向断裂的存在，可能导致了北西- se走向渐新世的形成。InSAR位移图显示下沉和上升速率分别为8.8 mm/年和7.7 mm/年。在阿南布拉盆地观测到的这种变形是由于断裂相关因素造成的，因为在Abakaliki背斜和Afikpo向斜之间的Ebonyi州发现了最高的沉降速率，以及盆地地层边界的差异加载。在城市扩张的中心阿南布拉市，发现地面沉降发生。盆地地下水位的增加也有助于降低下沉率。该研究揭示了导致阿南布拉盆地地壳变形的可能因素，为决策者提供了有效的城市规划和资源管理以及可能的人工地下水补给的信息。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

pure and applied geophysics 地学-地球化学与地球物理

CiteScore

4.20

自引率

5.00%

发文量

240

审稿时长

9.8 months

期刊介绍： pure and applied geophysics (pageoph), a continuation of the journal "Geofisica pura e applicata", publishes original scientific contributions in the fields of solid Earth, atmospheric and oceanic sciences. Regular and special issues feature thought-provoking reports on active areas of current research and state-of-the-art surveys. Long running journal, founded in 1939 as Geofisica pura e applicata Publishes peer-reviewed original scientific contributions and state-of-the-art surveys in solid earth and atmospheric sciences Features thought-provoking reports on active areas of current research and is a major source for publications on tsunami research Coverage extends to research topics in oceanic sciences See Instructions for Authors on the right hand side.