Volcanic Systems and Magmatic Processes in Subduction Zones

Subduction zones host some of the most dynamic volcanic systems on Earth, driven by the descent of an oceanic plate beneath a continental or another oceanic plate. Fluid release from the downgoing slab induces partial melting in the overlying mantle wedge, producing magmas that ascend through the crust to form volcanic arcs. As magma rises, it interacts with crustal rocks, evolves through fractional crystallisation and assimilation, and may stall in mid‐crustal reservoirs before eruption. The architecture of these plumbing systems—from deep mantle sources and slab‐derived metasomes to shallow magma chambers and conduits—controls eruption style, duration and hazard. Monitoring advances, including seismic, geodetic and geochemical methods, now capture transient phenomena such as reservoir recharge, dome growth and lateral magma transfer between vents. Understanding these processes is essential for assessing volcanic risk in densely populated arc regions, for modelling global geochemical cycles of volatiles and metals, and for interpreting the long‐term evolution of continental crust through arc magmatism.

Research from Nature Portfolio

Long‐term photogrammetric analysis of Bezymianny volcano has documented seven decades of post‐collapse edifice regrowth, revealing shifting vent locations and a transition from dome clusters to a focused stratocone. Numerical models attribute this vent migration to changing stress regimes as the volcanic load evolves. Complementary seismic tomography combined with satellite radar and petrology at the same volcano identified closely spaced low‐ and high‐Vp/Vs anomalies at 2–3 km depth, interpreted respectively as magma and gas reservoirs in the days before an explosive eruption. High‐resolution mapping of thermal anomalies in the Klyuchevskoy Volcanic Group using infrared satellite imagery demonstrated that adjacent volcanoes exhibit coordinated eruptive behaviour via hydraulically linked crustal plumbing. This interplay modulates magma output rates for years, indicating that volcanic clusters cannot be treated as isolated systems when assessing eruption likelihood and hazard.

Volcanic Systems and Magmatic Processes in Subduction Zones publication trend

The graph below shows the total number of articles in volcanic systems and magmatic processes in subduction zones across all publications each year (not limited to Nature Index journals).

Technical terms

Subduction zone: A convergent plate boundary where one tectonic plate sinks beneath another, triggering melting and volcanic arc formation.

Magmatic plumbing system: The network of interconnected pathways, reservoirs and conduits through which magma ascends and evolves beneath a volcano.

Seismic tomography: The technique of reconstructing subsurface seismic velocity distributions by inverting travel‐time data from earthquakes or ambient noise.

Vp/Vs ratio: The ratio of compressional‐wave to shear‐wave velocity in rocks, used to infer melt or fluid content within the crust.

Magma reservoir: A subsurface chamber or sill where magma accumulates, differentiates and mixes before eruption.

Ambient noise tomography: A form of seismic imaging that utilises continuous background seismic vibrations to extract surface‐wave information for subsurface structure mapping.

References

1. When linear inversion fails: Neural-network optimization for sparse-ray travel-time tomography of a volcanic edifice. Artificial Intelligence in Geosciences (2024).
2. The rebirth and evolution of Bezymianny volcano, Kamchatka after the 1956 sector collapse. Communications Earth & Environment (2020).
3. Anatomy of the Bezymianny volcano merely before an explosive eruption on 20.12.2017. Scientific Reports (2021).
4. Thermal remote sensing reveals communication between volcanoes of the Klyuchevskoy Volcanic Group. Scientific Reports (2021).
5. Magmatic and Sedimentary Structure beneath the Klyuchevskoy Volcanic Group, Kamchatka, From Ambient Noise Tomography. Journal of Geophysical Research: Solid Earth (2020).
6. Mantle and Crustal Sources of Magmatic Activity of Klyuchevskoy and Surrounding Volcanoes in Kamchatka Inferred From Earthquake Tomography. Journal of Geophysical Research: Solid Earth (2020).