(Volcano Watch is a weekly article written by scientists at the U.S. Geological Survey’s Hawaiian Volcano Observatory.)
It’s January 2017, and, in addition to wishing you Hauʻoli Makahiki Hou (Happy New Year), the USGS Hawaiian Volcano Observatory (HVO) welcomes you to the 8th annual Volcano Awareness Month on the Island of Hawaiʻi! Throughout the month, HVO, in cooperation with Hawaiʻi Volcanoes National Park and the University of Hawaiʻi, will offer public talks around the island. For the complete schedule, please visit HVO’s website (hvo.wr.usgs.gov).
As in years past, our Volcano Watch articles this month will explore a volcanic theme.
Most readers are familiar with HVO—the first volcano observatory in the United States, and one of the oldest such facilities in the world. But how well do you know the other four U.S. Geological Survey (USGS) volcano observatories, and how work in Hawaiʻi has influenced each?
We start our exploration with the second oldest USGS observatory—the David A. Johnston Cascades Volcano Observatory (CVO) in Vancouver, Washington.
CVO was founded after the devastating May 18, 1980, eruption of Mount St. Helens, during which the observatory’s namesake lost his life while monitoring the activity. During the two-month buildup to that eruption, a steady stream of volcanologists set up camp in Vancouver, collocated with U.S. Forest Service headquarters. Many of these scientists were current or past HVO staff, since Hawaiʻi is an ideal place for USGS scientists to gain familiarity with studying and monitoring active volcanoes.
Following the catastrophic 1980 eruption, several smaller explosions and lava extrusions occurred at Mount St. Helens, which demanded continuous observation to better understand how the volcano worked and to provide warnings of volcanic hazards. Most of the monitoring techniques used there had been pioneered in Hawaiʻi; for example, laser ranging and tilt to assess deformation, and strategies to sample gas emissions.
The acknowledgement that Mount St. Helens is just one of over a dozen large volcanoes in the Cascade Range of Washington, Oregon, and California led to CVO’s permanent establishment in 1982. The observatory rapidly built basic monitoring networks on all the volcanoes for which it is responsible.
After Mount St. Helens went quiet in 1986, CVO focused attention on other Cascade volcanoes and volcanic processes. Scientists designed experiments to understand volcanic landslides, studied how sediment from a volcano can influence river systems, and mapped each of the volcanoes to better understand their past activity.
Working groups were formed for each Cascade volcano to develop volcano response and coordination plans, which are critical tools for ensuring smooth communications and effective responses during a volcano crisis. The Volcano Disaster Assistance Program, a collaborative effort of the USGS and the U.S. Agency for International Development’s Office of U.S. Foreign Disaster Assistance that is headquartered at CVO, also quickly grew into a world renowned team of experts that responds to volcanic crises around the world at the request of foreign governments.
CVO’s preparation and vigilance paid off when Mount St. Helens rumbled back to life in September 2004, beginning a period of lava dome growth with occasional small explosions that lasted until early 2008. The eruption was a great opportunity for scientists to further develop new technologies to study the eruption, including remote cameras (based on an HVO design), as well as robotic “spiders” that hosted multi-parameter instrument packages and could be deployed by helicopter.
After 2008, CVO embarked on a mission to upgrade monitoring at all Cascade volcanoes, including better seismic networks, continuous GPS stations, gas monitoring sensors, and other instruments. In 2004, there were only four continuous GPS stations dedicated to volcano monitoring in the Cascades—one at Mount St. Helens and three at South Sister, Oregon. Today, there are several dozen GPS stations spread across the Range.
CVO’s work is not done, however. Some Cascade volcanoes still have relatively few monitoring instruments. Educating local populations about volcanic hazards—especially if the “volcano in their backyard” hasn’t erupted in several hundred years—also remains a priority. In these efforts, CVO and HVO work together, exchanging staff to facilitate the sharing of ideas and best practices.
Next week, we’ll visit the observatory that tracks volcanoes in the Last Frontier—Alaska! Until then, please join us for this coming week’s Volcano Awareness Month talks at Hawaiʻi Volcanoes National Park on January 10 and Hilo’s Lyman Museum on January 12.