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Mauna Loa update: unrest continues, but the outcome is uncertain...
September 14, 2017

Mauna Loa update: unrest continues, but the outcome is uncertain

Aerial view of Mauna Loa erupting on the morning of March 25, 1984, the first day of the volcano's most recent eruption. The lava flow was advancing southeast, toward Kīlauea, from fissure vents at an elevation of about 11,200 feet on Mauna Loa's Northeast Rift Zone. Moku‘āweoweo, Mauna Loa's summit caldera, is visible at top left.

Mauna Loa update: unrest continues, but the outcome is uncertain...
September 14, 2017

Mauna Loa update: unrest continues, but the outcome is uncertain

A USGS Hawaiian Volcano Observatory geologist monitored the advance of an ‘A‘ā lava flow on April 6 during the 1984 Mauna Loa eruption. This flow was about 4 m (13 ft) high and advancing at a rate of 50 m (55 yards) per hour. Lava reached within 6 km (4 mi) of Hilo city limits before the 22-day-long eruption ended on April 15.

Creative engineering helps HVO monitor Mauna Loa Volcano...
August 24, 2017

Creative engineering helps HVO monitor Mauna Loa Volcano

USGS Hawaiian Volcano Observatory field engineers begin the process of lowering a tiltmeter into a deep borehole on the west flank of Mauna Loa. The installation is guided by a custom-built apparatus that includes a 3-D printed jig. This tiltmeter will help monitor the currently elevated activity of Mauna Loa Volcano. USGS photo.

A beautiful sunset over Mauna Loa (in distance at left) provided a ...
July 21, 2017

A beautiful sunset over Mauna Loa (in distance at left) provided a ...

A beautiful sunset over Mauna Loa (in distance at left) provided a backdrop to the lava lake within Halema‘uma‘u. HVO and Jaggar Museum are on the horizon near the center of the panorama.

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.

panoramic view of the 1935 Humu‘ula flow
January 1, 2017

panoramic view of the 1935 Humu‘ula flow

This panoramic view of the 1935 Humu‘ula flow (black lava) on both sides of the Daniel K. Inouye Highway, which runs east to west in the saddle between Mauna Loa (snow-capped shield volcano at far left) and Mauna Kea (distant right), was taken from the top of Pu‘uhuluhulu. View is to the northwest. The top of Hualālai is visible in far distance (center).

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

Seabirds struggle for survival on Mauna Loa

A young 'ua'u exercises its wings in preparation for its first flight directly out to sea. The 'ua'u, 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.