News

In ongoing media coverage of demonstrations at the base of Mauna Kea, many hundreds of people can be seen standing on a black lava flow that surrounds...

HVO seismologist Brian Shiro discusses similarities and differences between the 2018 Hawai‘i and 2019 California earthquake sequences.

What is hydrothermal alteration, and why is it important? Most visitors to Yellowstone National Park are only vaguely aware of hydrothermal (hot water...

Video shows Moku‘āweoweo, the caldera at the summit of Mauna Loa, during a routine overflight. 

One year ago, activity on Kīlauea Volcano was remarkably different than it is today. Lava was flowing toward the sea, robust ocean entry plumes were...

Sunny weather at Kīlauea summit, no significant changes

Yellowstone Caldera Chronicles is a weekly column written by scientists and collaborators of the Yellowstone Volcano Observatory. This week's...

On July 2, HVO raised the Volcano Alert Level for Mauna Loa from "Normal" to "Advisory".

Shortly before midnight on July 5, 1975, Mauna Loa Volcano awakened with a shudder. Quickly responding to a seismic earthquake/tremor alarm at 11:18 p...

Yellowstone Caldera Chronicles is a weekly column written by scientists and collaborators of the Yellowstone Volcano Observatory. This week's...