Scientists reveal an explosive secret hidden beneath seemingly trustworthy volcanoes
The 2015 eruption at Wolf volcano in the Galapagos Archipelago.
Credit: Gabriel Salazar, La Pinta Yacht Expedition.
An international team of volcanologists working on remote islands in the Galápagos Archipelago has found that volcanoes which reliably produce small basaltic lava eruptions hide chemically diverse magmas in their underground plumbing systems—including some with the potential to generate explosive activity.
Many volcanoes produce similar types of eruption over millions of years. For example, volcanoes in Iceland, Hawai’i and the Galápagos Islands consistently erupt lavaflows—comprised of molten basaltic rock—which form long rivers of fire down their flanks. Although these lava flows are potentially damaging to houses close to the volcano, they generally move at a walking pace and do not pose the same risk to life as larger explosive eruptions, like those at Vesuvius or Mt. St. Helens. This long-term consistency in a volcano’s eruptive behavior informs hazard planning by local authorities.
The research team, led by Dr. Michael Stock from Trinity College Dublin and comprising scientists from the US, UK and Ecuador, studied two Galápagos volcanoes, which have only erupted compositionally uniform basaltic lava flows at the Earth’s surface for their entire lifetimes. By deciphering the compositions of microscopic crystals in the lavas, the team was able to reconstruct the chemical and physical characteristics of magmas stored underground beneath the volcanoes.
The results of the study show that—in contrast with the monotonous basaltic lavas erupted at the Earth’s surface—magmas beneath the volcanoes are extremely diverse and include compositions similar to those erupted at Mt. St. Helens.
The team believes that volcanoes consistently erupt compositionally uniform basaltic lavas when the amount of magma flushing through the ground beneath the edifice is high enough to “overprint” any chemical diversity. This can occur when volcanoes are located close to a “hot spot”—a plume of hot magma rising towards the surface from deep within the Earth.
However, the chemically diverse magmas which the team discovered could become mobile and ascend towards the surface under certain circumstances. In this case, volcanoes that have reliably produced basaltic lava eruptions for millennia might undergo unexpected changes to more explosive activity in the future.
Dr. Stock, from Trinity’s School of Natural Sciences, and lead author on the paper, said:
“This was really unexpected. We started the study wanting to know why these volcanoes were so boring and what process caused the erupted lava compositions to remain constant over long timescales. Instead we found that they aren’t boring at all—they just hide these secret magmas under the ground.”