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Date published: June 8, 2020

Updates to HVO's Kīlauea and Mauna Loa "Geology & History" Webpages

HVO has updated the Geology & History webpages for Kīlauea and Mauna Loa volcanoes. These pages now include maps and links to revised tables summarizing volcanic activity over the past ~200 years at each volcano.

You can also access the...

Date published: April 30, 2020

Volcano Watch — Looking for maps? GIS data? Try the HVO publications page!

Many messages to AskHVO (askHVO@usgs.gov) request resources relating to geologic maps and geographic information systems (GIS) data. "Is there a map of a certain ...

Date published: April 2, 2020

Volcano Watch — HVO looks to the past to better understand future Mauna Loa eruptions

Mauna Loa, the largest active volcano on Earth, has erupted, on average, every 5–6 years during the past 3,000 years.

Date published: March 19, 2020

Volcano Watch — HVO's geological sample collections are an important resource

In the past, HVO would occasionally post images of people collecting lava samples on our website. These photos usually...

Date published: March 12, 2020

Volcano Watch — Old bombs found on Mauna Loa: The rest of the story (Part 2)

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.

Date published: March 5, 2020

Volcano Watch — Old bombs found on Mauna Loa: The rest of the story (Part 1)

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. Today, we offer more info.

Date published: February 20, 2020

Volcano Watch — Chemical analyses shed light on possible origins of island ash deposits

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. We know that ash is from ...

Date published: December 12, 2019

Volcano Watch — HVO announces Volcano Awareness Month programs for January 2020

Neither Kīlauea nor Mauna Loa erupted in 2019, but this period of relative quiet must not lead to complacency about Hawaii's two most active volcanoes. Both will eventually erupt again.

Date published: November 21, 2019

Volcano Watch — Hilo had a close call from the 1881 Mauna Loa lava flow

Over the last two centuries, six lava flows erupted from Mauna Loa's Northeast Rift Zone and advanced toward Hilo.

Date published: October 24, 2019

Volcano Watch — High Altitude Station Maintenance on Mauna Loa

U.S. Geological Survey trucks pull off the shoulder of Mauna Loa Observatory Road before dawn. I park the Jeep at the helicopter staging area, a flat rubble strip flanked by a'a ...

Date published: October 10, 2019

Volcano Watch — Why do so many deep earthquakes happen around Pāhala?

The USGS Hawaiian Volcano Observatory (HVO) detects tens of thousands of earthquakes each year. Currently, one of the most active areas of seismicity is Kīlauea's lower Southwest Rift Zone.

Date published: October 3, 2019

Volcano Watch — Geologic history of Mauna Loa's southeast flank revealed in new map

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.