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GREEN NORMAL, 2019-05-14 21:55:35 UTC

Mauna Loa
GREEN NORMAL, 2019-05-03 20:54:38 UTC

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Hawaiian Volcano Observatory's mission
HVO monitors the active volcanoes in Hawaii, assesses their hazards, issues warnings, and advances scientific understanding to reduce impacts of volcanic eruptions.

HVO News  (archive)
Active Volcanoes in Hawaii1

Updates on Kīlauea, Mauna Loa, and HVO's future
April 10, 2019
HVO Scientist-in-Charge Tina Neal talked about the status of Kīlauea and Mauna Loa volcanoes, what was learned (so far) from the 2018 eruption, and the future of HVO in this 30-minute "Island Conversations" interview recorded on March 29. Listen here...
Geologic map of the central-southeast flank of Mauna Loa volcano, Island of Hawaiʻi, Hawaiʻi: USGS Scientific Investigations Map 2932–B
April 10, 2019
This map shows the distribution and relations of volcanic and surficial sedimentary deposits on the southeast flank of Mauna Loa, from 10,350-ft elevation to sea level, separated into 15 age groups. It is the second in a series of five maps that will cover Mauna Loa volcano. The first is posted at
Digital database of the geologic map of the middle east rift geothermal subzone, Kīlauea Volcano, Hawaiʻi: USGS Data Series 1111
April 10, 2019
This database release contains the information used to produce Geologic Investigations Series I-2614, a 2006 paper map that depicts part of the Kīlauea middle East Rift Zone, specifically areas east of Puʻu ʻŌʻō, including some of the 1977 flow field.
Volcano Alert Level for Kīlauea lowered to NORMAL
March 27, 2019
On March 26, 2019, in response to reduced activity on the volcano, HVO lowered the Volcano Alert Level for Kīlauea's ground-based hazards from ADVISORY to NORMAL, which means that the volcano is at a non-eruptive, background state. The Aviation Color Code for Kīlauea was also lowered from YELLOW to GREEN. Read the Volcanic Activity Notice for more information.
New USGS Report: Undocumented late 18th- to early 19th-century volcanic eruptions in the Southwest Rift Zone of Kīlauea Volcano
March 26, 2019
Kīlauea's Southwest Rift Zone was more volcanically active in the late 18th- to early 19th-centurys than previously assumed. A recent field study by USGS and University of Hawai‘i at Hilo scientists indicate that two large, long-lasting eruptions of lava took place sometime in the interval 1790–1823. Read the full report here...
The 2018 rift eruption and summit collapse of Kīlauea Volcano
February 22, 2019
In 2018, Kīlauea Volcano experienced its largest lower East Rift Zone (LERZ) eruption and caldera collapse in at least 200 years. Observations and insights from the events are described in this paper, written by the scientists who monitored the activity and published in Science on January 25, 2019. Read paper
How to stay informed about Hawaiian volcanoes
February 22, 2019
Following the dramatic events of 2018, Kīlauea is now relatively quiet. But it remains an active volcano that will erupt again, so it is wise to stay informed about its status, along with other active Hawaiian volcanoes. Here's how
Preliminary summary of Kīlauea Volcano's 2018 lower East Rift Zone eruption and summit collapse
September 27, 2018
Overview of Kīlauea Volcano's activity from April 30 through September 22, 2018.
Very High Threat Potential 1
Mauna Loa
High Threat Potential 1
Moderate Threat Potential 1
Mauna Kea
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1. View the threat rankings of US Volcanoes.