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<p>This study investigates the structural framework and geohazard relevance of Lampung, Indonesia, using gravity anomaly analysis and gravity-derived structural lineament mapping. Lampung lies within a tectonically complex setting shaped by the interaction of the Indo-Australian and Eurasian Plates, the Sumatran Fault System, and tectono-volcanic processes, resulting in pronounced geological heterogeneity relevant to volcanic and slope-related hazards. The analysis combines conventional gravity anomaly datasets, including free-air anomaly (FAA), complete Bouguer anomaly (CBA), regional anomaly, and residual anomaly, with advanced gradient-based filters, namely the tilt angle of the horizontal gradient (TAHG), improved horizontal tilt derivative (ITDX), enhanced horizontal gradient amplitude (EHGA), and fast sigmoid-based edge detection (FSED). The results reveal a multi-scale structural pattern in which principal NW–SE to NNW–SSE trends are broadly consistent with the regional tectonic grain of the Semangko system, while subordinate oblique and curvilinear features suggest additional influence from lithological contrasts, basin margins, volcanic centers, and local structural complexity. Comparison with the geological framework suggests that several of the more continuous gravity-derived features are spatially associated with mapped fault corridors and major geological boundaries, whereas others more likely represent broader density-contrast edges. Residual gravity lows in the Liwa–Ranau sector and parts of the eastern Lampung lowlands may correspond to sedimentary or structurally weakened domains that warrant further consideration in relation to ground motion amplification and liquefaction susceptibility. Conversely, residual highs and sharper filtered gradients may reflect denser basement-related blocks or structurally uplifted domains, while structurally complex upland sectors in West Lampung may deserve additional attention in slope instability studies. Overall, the study provides a regional gravity-based framework that helps constrain subsurface structural architecture and supports further tectonic, geohazard, and geothermal investigations in Lampung.</p>

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Gravity signatures and structural lineaments in Lampung, Indonesia: implications for geohazard evaluation

  • 期刊论文

  • 发表日期：

    2026年7月8日

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  • Erlan Sumanjaya,
  • Darmawan Ikhlas Fadli,
  • Nanda Ridki Permana,
  • Aulia Purqan,
  • Haryadi Adhan,
  • Nandi Haerudin

摘要

This study investigates the structural framework and geohazard relevance of Lampung, Indonesia, using gravity anomaly analysis and gravity-derived structural lineament mapping. Lampung lies within a tectonically complex setting shaped by the interaction of the Indo-Australian and Eurasian Plates, the Sumatran Fault System, and tectono-volcanic processes, resulting in pronounced geological heterogeneity relevant to volcanic and slope-related hazards. The analysis combines conventional gravity anomaly datasets, including free-air anomaly (FAA), complete Bouguer anomaly (CBA), regional anomaly, and residual anomaly, with advanced gradient-based filters, namely the tilt angle of the horizontal gradient (TAHG), improved horizontal tilt derivative (ITDX), enhanced horizontal gradient amplitude (EHGA), and fast sigmoid-based edge detection (FSED). The results reveal a multi-scale structural pattern in which principal NW–SE to NNW–SSE trends are broadly consistent with the regional tectonic grain of the Semangko system, while subordinate oblique and curvilinear features suggest additional influence from lithological contrasts, basin margins, volcanic centers, and local structural complexity. Comparison with the geological framework suggests that several of the more continuous gravity-derived features are spatially associated with mapped fault corridors and major geological boundaries, whereas others more likely represent broader density-contrast edges. Residual gravity lows in the Liwa–Ranau sector and parts of the eastern Lampung lowlands may correspond to sedimentary or structurally weakened domains that warrant further consideration in relation to ground motion amplification and liquefaction susceptibility. Conversely, residual highs and sharper filtered gradients may reflect denser basement-related blocks or structurally uplifted domains, while structurally complex upland sectors in West Lampung may deserve additional attention in slope instability studies. Overall, the study provides a regional gravity-based framework that helps constrain subsurface structural architecture and supports further tectonic, geohazard, and geothermal investigations in Lampung.