News

The USGS Hawaiian Volcano Observatory (HVO) detects tens of thousands of earthquakes each year. Currently, one of the most active areas of seismicity...

The recently published "Geologic map of the central-southeast flank of Mauna Loa volcano" is the culmination of years of field work by the U.S...

HVO rebuilds and relocates Mauna Loa gas monitoring instruments

An early morning view looking north across Moku‘āweoweo, Mauna Loa's summit caldera, from a spot near the summit cabin on the volcano's south caldera...

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...

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

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...

This timelapse sequence of webcam images over a 24-hour period shows a typical day at the summit of Mauna Loa. 

Routine visit to Mauna Loa summit.