Hawai'i Volcano Blog

Our analysis indicates that increasing pressure in the magmatic system, which far exceeds the change in pressure modeled as due to rainwater infiltration, was the primary driver in triggering the 2018 eruption.

Forty years ago, no scientists in the USGS and academia were adept at monitoring all types of active volcanoes.

The first eruption in the Cascades since 1914­–1917 (Lassen Peak) started on March 27, 1980.

Janet volunteered at HVO for many years before being hired in 2008 to help the Observatory manage public information during Kīlauea’s first summit eruption since 1982.

Since 1843, Mauna Loa has erupted 33 times.

The USGS Hawaiian Volcano Observatory continues to monitor and issue regular updates on Hawaiian volcanoes while also heeding Federal and CDC, as well as State and County guidelines to maintain the health and safety of our staff and the community.

When a sample is collected, it’s important to document the sample’s “metadata.”

HVO carefully archives or curates these precious geological samples collected by current and past HVO geologists, collaborators, visiting scientists, and volunteers.

Last week’s Volcano Watch provided details of events leading up to the dropping of bombs on a Mauna Loa lava flow on December 27, 1935. Here’s the rest of the story.

In late February 2020, Hawaii media reported on the recent discovery of two bombs on the north flank of Mauna Loa, but details were lacking.

In recognition of this historic event, we look back at the eruption and compare it to what happened in 2018. 

Thurston Lava Tube in Hawai‘i Volcanoes National Park has officially reopened to the public after the eruption of Kilauea shut it down for over a year.

The origin(s) of volcanic ash deposits on the Island of Hawai‘i have been an enigma, especially those found on and between Kīlauea and Mauna Loa.

While there used to be over 4,000 individual Portulaca plants in the Puhimau thermal area in 1983, there are now fewer than 30 naturally occurring individuals.

Hawai‘i Volcanoes National Park is looking for input from the community on the future of the Great Crack.

The 1,000th ‘Ōhi‘a tree within Volcanoes National Park was tested for the presence of fungi that causes Rapid ‘Ōhi‘a Death, or ROD.

The general approach to using geologic data on a volcano is to reconstruct how the volcano formed. We then use this information to model or forecast how the volcano could behave in the future.

Kīlauea Visitor Center in Hawai‘i Volcanoes National Park is scheduled for a major air conditioning system installation.

The on-duty seismologist tracks earthquake activity each day and must be ready to respond to hazardous earthquakes or to significant changes in seismic activity at our volcanoes.

National Parks Service volunteer Janice Wei captured a mesmerizing sky just after sunrise over Kīlauea Iki Overlook in Volcanoes National Park.