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New map reveals geologic history of Mauna Loa Volcano's northeast f...
July 13, 2017

New map reveals geologic history: Mauna Loa Volcano's NE flank

"Geologic map of the northeast flank of Mauna Loa volcano, Island of Hawai‘i," published by the U.S. Geological Survey in May 2017, shows the distribution of lava flows and other deposits covering an area from Pu‘u‘Ula‘ula ("Red Hill") on the southwest to Hilo on the northeast. Ages of the geologic units are indicated by color: reds and oranges are younger, blues and

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Tracking the latest moves of Kīlauea and Mauna Loa...
June 1, 2017

Tracking the latest moves of Kīlauea and Mauna Loa

Interferometric Synthetic Aperture Radar (InSAR) images of Kīlauea (left) and Mauna Loa (right) spanning the past several years. Concentric patterns of colored fringes indicate magma accumulation centered near the summit calderas of both volcanoes. InSAR is one of several techniques used by the USGS Hawaiian Volcano Observatory to track deformation of active Hawaiian

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A clear day provided a stunning view of Mauna Loa's summit...
May 10, 2017

A clear day provided a stunning view of Mauna Loa's summit

USGS scientists hiked to the summit of Mauna Loa, where they checked on HVO's monitoring instruments and realigned an antenna that allows webcam images of the volcano's summit caldera (shown in this panoramic image) to be posted on the HVO website. Unfortunately, the "Moku‘āweoweo Caldera Multi-Frame" webcam could not be repaired during this summit trek, but the issue

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Lava Inundation Zones Identified for Mauna Loa...
March 3, 2017

Lava Inundation Zones Identified for Mauna Loa

Inundation zones shown on map sheets as numbered colored boxes.

Seabirds struggle for survival on Mauna Loa...
November 17, 2016

Seabirds struggle for survival on Mauna Loa

A young uAU exercises its wings in preparation for its first flight directly out to sea. The uAU, or Hawaiian petrel, is a federally endangered native seabird that nests at high elevations on Mauna Loa volcano. For more information, please visit the Hawai‘i Volcanoes National Park website: https://www.nps.gov/havo/

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Jaggar's prediction comes true—the 1935 eruption of Mauna Loa...
September 8, 2016

Jaggar's prediction comes true—the 1935 eruption of Mauna Loa

This photo, taken by Thomas Jaggar on December 21 during the1935 Mauna Loa eruption, shows the Humuula pāhoehoe flow ponding and slowly expanding eastward. The image looks east-southeast toward Pu‘uhuluhulu from the southernmost Omaokoili cinder cone in the vicinity of today's Saddle Road and Mauna Kea Access Road juncture. USGS photo.

Mauna Loa Southwest Rift Zone's eruptions stopped traffic—and more...
June 9, 2016

Mauna Loa Southwest Rift Zone's eruptions stopped traffic—and more

This rapidly moving ‘A‘ā lava flow was one of several that advanced down the west flank of Mauna Loa during the volcano's 1950 eruption. The massive flow, tens of meters (yards) high, traveled from the Southwest Rift Zone vent to the ocean, a distance of about 18 km (11 mi), in around 18 hours. Two earlier flows from this eruption reached the ocean in as little as three

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Scientists search for the right "keys" to Mauna Loa...
May 19, 2016

Scientists search for the right "keys" to Mauna Loa

A USGS Hawaiian Volcano Observatory chemist conducts thermal imaging measurements as part of a geochemical survey on Mauna Loa's upper Southwest Rift Zone in March 2016. Areas like the one shown here can indicate where gases are escaping from magma at depth. USGS photo.

Mauna Loa 1950 eruption: A lot of lava with little warning...
April 7, 2016

Mauna Loa 1950 eruption: A lot of lava with little warning

During the Mauna Loa 1950 eruption, three large, fast-moving lava flows advanced down the west flank of the volcano, each crossing the main highway before reaching the ocean. The Ka‘apuna flow, shown here, traveled from the Southwest Rift Zone vent (7,800 ft elevation) to the coast in just 17 hours, creating a huge steam plume as lava flowed into the sea. The glowing edges

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Mauna Loa: Earth's largest active volcano is still stirring...
February 25, 2016

Mauna Loa: Earth's largest active volcano is still stirring

One of the new tools deployed by the USGS Hawaiian Volcano Observatory to better monitor the current unrest on Mauna Loa is a webcam focused on the volcano's Southwest Rift Zone, which has been the site of eruptions in 1903, 1916, 1919, 1926, and 1950. Webcam images of Mauna Loa's summit, Northeast Rift, and Southwest Rift (like the one shown here from the morning of

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Satellite image showing images of islands for Kilauea and Mauna Loa Hawaii
January 9, 2016

Kilauea, Mauna Loa Volcanoes Shape the Face of Hawaii

Though the park celebrates its 100th anniversary on August 1, 2016, its main attractions-Kilauea and Mauna Loa volcanoes-have been adding to the land mass of Hawaii’s “Big Island” for at least 400,000 years. That expansion continues today as bright molten lava from Kilauea flows downslope across the coastal plain on its south flank, spilling over a cliff on its way to a

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