Tuesday | August 30, 2016
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All sorts of gifts come in all sorts of packages

A tradition each year on Valentine’s Day is the exchange of gifts. If you’re giving a gift you’ve wrapped, a big part of the fun is watching your true love receive the present. Most recipients look at how nicely the package is wrapped, give it a shake or two, and maybe even guess what they think might be inside before tearing the paper off. This ritual can be fun — but not always if the person receiving the gift happens to be a volcanologist.

To some degree, volcanologists are puzzle-obsessed. Hand them a wrapped package on Valentine’s Day, and you might be there for hours as they measure its size and weight, feel its shape, sniff, shake and listen to it, and maybe even check the historical records to determine if they’ve seen a gift that looked like this one in the past 100 years or so. (You need to be careful about “re-gifting” to these folks.)

If dedicated enough, your volcanologist valentine will do a final thing after gathering together the many pieces of data: start drawing a cartoon cross-sectional diagram of the inside of the gift on the back of an envelope. What you’ve just observed is a scientist (arguably one with a death wish) constructing a conceptual model to help solve the package puzzle.

The reason for this sort of puzzle obsession among volcano scientists is that many of them spend their lives trying to figure out what’s going on deep underground in places they will never actually get to see inside volcano “packages.”

Volcano conceptual models vary, but they typically appear as cartoon sketches of what we think the inside of the volcano might look like. By factoring in different types of information, models help volcano researchers with diverse interests work together to formulate questions and devise experiments that test and refine the model’s validity.

Although the idea sounds simple, the first conceptual model for Hawaiian volcanoes wasn’t published until 1960. At that time, Hawaiian Volcano Observatory scientists Jerry Eaton and Jack Murata were poring over data from newly modernized instruments, refined maps of surface vents and flows and detailed analyses of the physical and chemical properties of Kilauea lavas. The result of their labors was a 3-D representation of an idealized Hawaiian volcano’s subsurface structure.

From the seismic and tilt data, Eaton and Murata’s diagram hypothesized that a relatively narrow conduit transports magma from a 30-mile deep mantle source to shallow magma chambers from which lava can either be erupted at the summit or along rift zones. Their brave conceptual step forward was aided by the 1959 Kilauea Iki eruption at the summit, and the 1960 Kapoho eruption, on Kilauea’s lower east rift. Their paper, including the conceptual model, was published in the high profile journal Science. This fired up numerous researchers eager to apply their specialties — geophysics, geochemistry, geology and others — to test and extend the model.

The next significant enhancements to the conceptual model of Hawaiian volcanoes that we at HVO broadly use occurred after major expansions of Kilauea’s seismic and tilt networks, petrologic and gas studies, and geologic observational capabilities. Importantly, the enhanced computing power that became available to visualize and manipulate the data contributed to the model’s improvements. And once again, the model was driven forward by dramatic eruptive happenings, this time occurring both at Kilauea’s summit and east rift zone.

One scientific paper that will be part of a soon-to-be-released special volume commemorating HVO’s centennial looks back at its progress toward better understanding of the nature of magma supply, storage and transport at shield-stage Hawaiian volcanoes. Included in this paper is one of several late-breaking conceptual models for Kilauea. We’re looking forward to a widespread discussion in the volcano science community.

Solving volcano puzzles is not simply an intellectual pursuit; it is a practically applied one, as well. More than 500 million people worldwide live on or near active volcanoes. Understanding how volcanoes work helps us protect ourselves from their hazards while we appreciate their effusive beauty.

Kilauea activity update

A lava lake within the Halemaumau Overlook vent produced nighttime glow visible from the Jaggar Museum overlook and via HVO’s webcam during the past week. The lake level fluctuated slightly in response to summit deflation-inflation events but was generally between about 80 and 100 feet below the floor of Halemaumau.

On Kilauea’s east rift zone, surface lava flows remain active about midway across the coastal plain along with some weak activity near the coast. Small ocean entries remain active just inside and just outside Hawaii Volcanoes National Park.

At Puu Oo, lava erupting from a complex of spatter cones on the northeast side of the crater floor — the former site of a small lava lake — is feeding a slow-moving pahoehoe flow spreading toward the northeast. Other spatter cones on the crater floor have sporadically erupted tiny, short-lived flows, at least one of which traveled a few hundred yards down Puu Oo’s southeast flank.

There were no felt earthquakes in the past week on the island of Hawaii.

Visit hvo.wr.usgs.gov for Volcano Awareness Month details and Kilauea, Mauna Loa and Hualalai activity updates, recent volcano photos, recent earthquakes and more; call 967-8862 for a Kilauea summary; email questions to askHVO@usgs.gov.

Volcano Watch is a weekly article and activity update written by scientists at the U.S. Geological Survey’s Hawaiian Volcano Observatory.