Categorized | Featured, Sci-Tech, Volcano

Volcano Watch: HVO scientists participate in the American Geophysical Union Fall Meeting

Kīlauea Volcano’s summit lava lake was just one of many topics that USGS Hawaiian Volcano Observatory scientists talked about at the recent American Geophysical Union meeting in San Francisco. HVO webcams captured this small explosion triggered by rocks falling from the Halema‘uma‘u Crater wall into the lava lake on May 3, 2015, when the lake surface was just below the vent rim. USGS image.

Kīlauea Volcano’s summit lava lake was just one of many topics that USGS Hawaiian Volcano Observatory scientists talked about at the recent American Geophysical Union meeting in San Francisco. HVO webcams captured this small explosion triggered by rocks falling from the Halema‘uma‘u Crater wall into the lava lake on May 3, 2015, when the lake surface was just below the vent rim. USGS image.

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

Last week, nearly 24,000 scientists from the U.S. and abroad met in San Francisco for the American Geophysical Union’s 2015 Fall Meeting, the largest annual Earth and space science meeting in the world.

The five-day event was filled from morning to night with more than 23,000 talks and poster presentations and 300 technical exhibits and demonstrations of new scientific tools and publications, as well as networking opportunities and a multitude of sidebar meetings. Attendees exchanged ideas, heard recent discoveries, debated evidence, and defined new directions for research.

As is customary, a number of USGS Hawaiian Volcano Observatory (HVO) scientists attended the meeting to present information ranging from summaries of recent activity at Hawaiian volcanoes to results of their research on various volcanic topics. They were joined by other USGS and university coworkers who are investigating many aspects of Hawaiian volcanology, often in direct collaboration with HVO.

Several HVO talks and posters dealt with the Halemaʻumaʻu Crater lava lake. One presentation offered insights into how and why the lake transitions from times of quiet lava upwelling and circulation to periods of unstable lava spattering (one explanation is rockfalls). Other lava lake studies examined how rockfalls influence seismicity and what this can tell us about the properties of magma within the conduit.

Current and former HVO staff presented analyses of the April-May 2015 lava lake overflows within Halemaʻumaʻu and the coincident deformation and seismicity within Kīlauea’s summit and upper rift zones. Scientists were able to discern transfer of magma from the shallow Halemaʻumaʻu reservoir into a south caldera magma storage area. Further analyses will provide new insights into how Kīlauea’s magma plumbing system behaves. Another HVO poster showed how the current location of magma under Kīlauea’s summit is inconsistent with where magma resided in the past.

Sulfur dioxide gas emissions from the crater of Pu‘u ‘O‘o on Kīlauea’s east rift zone (above) and the vent within Halemaumau Crater at Kilauea’s summit create volcanic pollution that affects the air quality of downwind communities. Here, an HVO gas geochemist measures Pu‘u ‘O‘o gas emissions using an instrument that detects gas compositions on the basis of absorbed infrared light. Photo courtesy of USGS/HVO

Sulfur dioxide gas emissions from the crater of Pu‘u ‘O‘o on Kīlauea’s east rift zone (above) and the vent within Halemaumau Crater at Kilauea’s summit create volcanic pollution that affects the air quality of downwind communities. Here, an HVO gas geochemist measures Pu‘u ‘O‘o gas emissions using an instrument that detects gas compositions on the basis of absorbed infrared light. Photo courtesy of USGS/HVO

HVO’s long-term monitoring of Kīlauea gas emissions was also featured at the meeting. This included a discussion of the possibility that the Puʻu ʻŌʻō eruption might be waning based on lowered sulfur dioxide gas emissions and analyses of sulfur preserved in melt inclusions within olivine crystals. How this long-term trend relates to Kīlauea’s summit gas emissions, which are still quite elevated, is the subject of ongoing study.

Two presentations addressed explosive and effusive cycles at Kīlauea, an important aspect of the volcano’s long-term history with implication for hazards. The studies represent two different ways of looking at the issue: geochemical lab analyses of tiny crystals in volcanic ash and field examinations of the relationship and characteristics of tephra deposits. Convergence of insights from these disparate approaches is accelerating our understanding of important questions, such as what controls Kīlauea’s eruptive cycles and how we might know a transition is coming.

The use of new technology to study volcanoes was also presented at the meeting. University of Hawai‘i at Hilo scientists demonstrated the use of UAVs (Unmanned Aerial Vehicles) to monitor pāhoehoe emplacement and inflation. Another team reported on kite-based imaging and analysis of the 1974 Kīlauea lava flow.

Other scientists shared results from laboratory experiments to simulate lava flows, magma motion, and the explosive expulsion of gas and lava from a vent, all documented with high-definition, high-speed video. Using materials that closely replicate the properties of magma and its gas bubbles, these experiments approximate what is actually happening inside an erupting vent or lava flow—places otherwise inaccessible.

Several HVO and UH-Mānoa poster presentations dealt with the 2014-2015 Pāhoa lava flow crisis. Each discussed how scientists conveyed hazard information to emergency managers and the public. Hazard communicators from other fields (earthquake, tsunami, weather) were interested in the Pāhoa experience and how HVO’s communication efforts might be applied to other hazardous events.

The AGU meeting also involves recognizing extraordinary careers of scientific achievement. This year, former HVO scientist Dan Dzurisin, now at the USGS Cascades Volcano Observatory, was honored for his decades-long research on volcano deformation.

Why do scientists spend a week listening and talking to each other from dawn to dusk? Recent and cutting-edge information, most of it not yet published, is presented at the AGU meeting, creating an atmosphere of excitement, discovery, and camaraderie among scientists that is highly stimulating. HVO participants always come away with new ideas and renewed enthusiasm for understanding Hawaiian volcanism and its hazards.

3 Responses to “Volcano Watch: HVO scientists participate in the American Geophysical Union Fall Meeting”

  1. bugsie says:

    Now that they are back maybe they can fix the webcams ;.”]

  2. Great talks but there is still a long way to go to be able to predict volcanic eruptions!

  3. jungletrails says:

    Seems like a waste of time and money to install webcams when they are quickly destroyed. Perhaps only if there is something around them to prevent (not discourage) vandals. I agree with the last comment, we have a long way to go before we can get our scientists back on board.

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