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. Geological Survey. This updated map supersedes the “Geologic
Hawaiian Volcano Observatory
VOLCANOWatch: HVO Staff Lend a Helping Hand to Alaska Colleagues
Volcano observatories across the United States work together to ensure efficient and thorough monitoring of the nation’s active volcanoes. This collaboration is particularly evident during a crisis, like the 2018
VOLCANOWatch: New Research Sheds Light on Relationship Between Hilina Fault System and Large Earthquakes
The pali (cliffs) of Kīlauea’s south flank are some of the volcano’s most striking features. Reaching up to 500 m (1500 ft) high, they stand out against the otherwise gentle
VOLCANOWatch: What Does Water in Halemaʻumaʻu Mean?
The slowly deepening pond of water on the floor of Halemaʻumaʻu, the first in recorded history, has captured the interest of media and the public, both locally and nationally. Many
VOLCANOWatch: HVO Now Tracking Ponds of Water, Not Lava, at Kīlauea’s Summit
The recent appearance of water at the bottom of Halema‘uma‘u, a crater at the summit of Kīlauea Volcano, has attracted wide attention and generated many questions. To understand the significance
VOLCANOWatch: Water or No Water: That Is (Or Was) the Question
USGS Hawaiian Volcano Observatory scientists usually base their research on observations, either visual or instrumental. Interpretations come from these observations, so they must be as good as possible. Incorrect observations
VOLCANOWatch: Mauna Loa Volcano’s 1935 Lava Flow Seen in Current Media Coverage of Mauna Kea
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 the Puʻuhuluhulu Native
VOLCANOWatch: Heat and Gases Linger on Kīlauea Volcano’s Lower East Rift Zone
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 fumigating coastal areas, and island
VOLCANOWatch: Mauna Loa’s 1975 Eruption in Terms of Today’s Volcano Alert Level
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.m., USGS Hawaiian Volcano Observatory (HVO) staff
VOLCANOWatch: USGS Volcano Notification Service Informs Island Residents about Hawaiian Volcanoes
Hawai`i residents are likely familiar with the Volcano Activity Updates that the Hawaiian Volcano Observatory issues for Kīlauea and other active Hawaiian volcanoes. These updates, which provide situational awareness of