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<p>Northwest Saudi Arabia's Harrat Lunayyir is a continental volcanic field with unparalleled seismic activity records. In 2009, this specific area experienced a huge surface rupture of 3&#xa0;km due to seismic swarm include more over 30,000 earthquakes. To enhance the comprehension of relationship between seismic activities and post-seismic deformation, we combined various datasets, including Gravity Recovery and Climate Experiment (GRACE) data, Interferometric Synthetic Aperture Radar (InSAR) imagery, aeromagnetic surveys, and local seismic records. Our analysis shows that, (1) a rapid change in GRACE gravity anomalies about 2 ± 2 × 10⁻² µGal, (2) a significant increase in seismic activity, with some events ranging in magnitude from 4 to 6 ML within a single day, and (3) a clustering of shallow earthquake sources &lt; 10&#xa0;km. The research study provides new insights in geodynamic behavior and region’s response to tectonic stress and magmatic interactions, particularly in areas with similar tectonic setting. This integrated approach can also point out areas that might be at risk because of ongoing stress accumulation, helping to protect people and property in places facing similar threats around the world.</p>

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Use of remote sensing and GRACE techniques for assessment of volcanic activities in Harrat Lunayyir, Saudi Arabia

  • 期刊论文

  • 发表日期：

    2025年12月18日

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  • Abdullah Othman,
  • Karem Abdelmohsen

摘要

Northwest Saudi Arabia's Harrat Lunayyir is a continental volcanic field with unparalleled seismic activity records. In 2009, this specific area experienced a huge surface rupture of 3 km due to seismic swarm include more over 30,000 earthquakes. To enhance the comprehension of relationship between seismic activities and post-seismic deformation, we combined various datasets, including Gravity Recovery and Climate Experiment (GRACE) data, Interferometric Synthetic Aperture Radar (InSAR) imagery, aeromagnetic surveys, and local seismic records. Our analysis shows that, (1) a rapid change in GRACE gravity anomalies about 2 ± 2 × 10⁻² µGal, (2) a significant increase in seismic activity, with some events ranging in magnitude from 4 to 6 ML within a single day, and (3) a clustering of shallow earthquake sources < 10 km. The research study provides new insights in geodynamic behavior and region’s response to tectonic stress and magmatic interactions, particularly in areas with similar tectonic setting. This integrated approach can also point out areas that might be at risk because of ongoing stress accumulation, helping to protect people and property in places facing similar threats around the world.