Glimpses Of Blasts: Ten Years Of High-Speed Imaging Of Explosive Volcanic Eruptions
About the Event:
Explosive volcanic eruptions involve, by definition, fast processes that are transient at the second to sub-second time scale. Such processes have been traditionally elusive to capture, falling within the realm of high-frequency seismic and acoustic recordings. High-speed imaging, picturing erupting volcanoes at 500 or more frames per second, has expanded our understanding of many of the transient dynamics driving explosive activity. In the last ten years, we have been filming in high-speed multiple erupting volcanoes, including Stromboli and Etna (Italy), Fuego and Santiaguito (Guatemala), Sakurajima (Japan), Batu Tara (Indonesia), Yasur (Vanuatu), and Kilauea (United States). We also used the same setup to record several eruption-mimicking experiments, including shock-tube jets and underground explosions. The results, integrating several eruption styles and experimental approaches, shed new light on a variety of eruption processes, including: 1) the fragmentation, ejection, and emplacement of pyroclast; 2) sources of eruptive acoustic emissions; 3) explosion source depth; and 4) vent control on eruption style.
About the Speaker:
Jacopo obtained his Master and PhD at Sapienza University of Rome working on facies and textures of pyroclastic deposits. He then went on for a PostDoc at University of Munich working on magma fragmentation and origin of pyroclasts. At the Istituto Nazionale di Geofisica e Vulcanologia since 2002, he is first studying the textures and deposits of mafic and phreatomagmatic eruptions, then performing high-speed imaging of eruptions: still looking at pyroclasts, but now they move!