Khalil Ibrahim, Satria Bijaksana, Mirzam Abdurrachman, David Prambudi Sahara, Putu Billy Suryanata, Sitti Zulaikah, Rezki Wirawan, Ulvienin Harlianti, Thomas Andre Maris Widagdo, Silvia Jannatul Fajar, Yohansli Noya, Ni Komang Tri Suandayani
This study aims to clarify how contrasting tectonic regimes influence magma storage, connectivity, and emplacement in spatially adjacent volcanic systems within a single arc segment in East Java, Indonesia. We focus on the polygenetic Bromo–Tengger–Semeru (BTS) complex and the Lamongan Monogenetic Volcanic Field (LMVF), employing integrated gravity and magnetic approaches including Bouguer anomaly modeling, 3D Euler and 2D Werner deconvolution, constrained gravity inversion, and magnetic edge detection. A vertically extensive, lens-shaped high-density body is imaged beneath BTS between 5 and 20 km depth, with indications of lateral connectivity between Semeru and Bromo aligned along N-S compressional structures. In contrast, LMVF shows only shallow, dyke-like intrusions (<2.5 km) aligned with NW–SE and NE–SW faults, spatially correlated with maar lakes and cinder cones. These findings support a model in which compressional tectonics in BTS promote deep, laterally connected magma reservoirs, while extensional faulting in LMVF facilitates shallow, structurally guided intrusions. This comparative analysis highlights the role of tectonic segmentation in shaping magmatic structure and provides a replicable framework for integrated geophysical analysis of arc volcanism. © 2025 Elsevier B.V.
Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung, 40132, Indonesia; Faculty of Earth Sciences and Technology, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung, 40132, Indonesia; Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Malang, 65145, Indonesia; Faculty of Mathematics and Natural Sciences, Universitas Udayana, Bali, Badung, Indonesia
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