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Posts by Shanaka de Silva

Turning up the Heat: High-Flux Magmatism in the Central Andes

The Neogene history of the Central Andes records one of Earth’s most productive periods of high-flux silicic magmatism. Subduction of an aseismic ridge, the Juan Fernández Ridge (JFR), led to changes in mantle melt productivity that initiated a transcrustal magmatic system culminating in massive caldera- and ignimbrite-forming eruptions. This volcanism is time transgressive, tracking the southward passage of the JFR beneath the Central Andes. The volcanic field is underlain by a composite, arc-long mid- and upper-crustal granodiorite batholith that represents extensive processing of the continental crust by mantle-derived magmas. This batholith stabilized the upper crust and contributed to the extreme elevations despite a net crustal loss beneath the Puna region.

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Global Volcanic Hazards and Risk

Major environmental challenges affecting human communities require geoscientists who are not only scientifically and technically trained but who recognize their broader commitment to society. With 800 million people at risk from volcanic activity around the world, and populations ever increasing, volcanologists are embracing a more integrative applied approach, which is necessary to understand the human dimensions of volcanic activity. This now extends beyond the few volcano observatories and government agencies previously tasked with this charge to include the academic community. The edited volume Global Volcanic Hazards and Risk presents a state-of-the-art assessment of the preparedness of the global scientific community and government agencies to manage large-scale volcanic hazards and risks. The book also highlights the broad collaboration that exists in the volcanological and associated communities, with over 130 scientists from 86 institutions in nearly 50 countries worldwide contributing to this publication.

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