Multimedia

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view looking north across Mauna Loa's summit caldera
September 8, 2019

early morning view looking north across Moku‘āweoweo

An early morning view looking north across Moku‘āweoweo, Mauna Loa's summit caldera, from a spot near the summit cabin on the volcano's south caldera rim. Frost covered much of the caldera floor that was still shadowed, and weak steaming issued from the usual areas. Overall, there were no significant changes observed at the summit. The 1940 and 1949 cones are visible in

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July 10, 2019

Routine overflight of Mauna Loa summit

This video shows Moku‘āweoweo, the caldera at the summit of Mauna Loa, during a routine overflight. The flight path goes from northeast to southwest, and begins at North Pit crater before crossing over the main caldera floor. In the southwest portion of the caldera floor, the 1940 and 1949 cones can be seen. The video ends as the helicopter flies over South Pit, at the

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April 29, 2019

Timelapse sequence shows a typical day at Mauna Loa's summit

This timelapse sequence of webcam images over a 24-hour period shows a typical day at the summit of Mauna Loa. The webcam (MLcam) is located on the northeast rim of Moku‘āweoweo, Mauna Loa's summit caldera. This sequence begins in the dark, with the moon rising (white dot at left in images), then brightens as the sun rises. Clear skies in the morning shift to cloudy

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floor of Mauna Loa caldera floor with blue sky in the background
April 24, 2019

Mauna Loa caldera

HVO staff visited the summit of Mauna Loa on foot to repair the webcam on April 24. The weather was perfectly clear and views of the caldera floor showed nothing unusual.

HVO geologist walks along the Mauna Loa summit trail
April 24, 2019

HVO geologist walks along the Mauna Loa summit trail

An HVO geologist walks along the Mauna Loa summit trail, with Mauna Kea visible in the distant background.

HVO scientists inspect a seismic station on Mauna Loa
April 12, 2019

HVO scientists inspect a seismic station on Mauna Loa

HVO scientists inspect a seismic station on Mauna Loa to evaluate for a possible equipment upgrade in the near future.

HVO scientists measure a GPS instrument
April 12, 2019

HVO scientists measure a GPS instrument

HVO scientists measure a GPS instrument to ensure its stability during a multi-day deployment in the Kahuku Unit of Hawai‘i Volcanoes National Park. In recent weeks, HVO has been working to complete a GPS campaign on Mauna Loa, which involves temporary deployments of high-precision GPS receivers to collect data that will help refine models of the volcano's inflation.

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GPS station on Mauna Loa
March 27, 2019

GPS survey is completed annually on Mauna Loa

A high-precision Global Positioning System (GPS) survey is completed annually on Mauna Loa. This station was occupied for a period of three days to supplement the continuously operating GPS stations on the volcano. A beautiful view of Mauna Kea (in distance) could seen from this site during the GPS survey. 

Mauna Loa Back to Normal...
June 22, 2018

Mauna Loa Back to Normal

View of cinder cones in the Northeast Rift Zone near the summit of Mauna Loa. View to the north-northeast with Mauna Kea in the background. Mauna Loa has erupted 33 times since 1843, most recently erupting in 1975 and 1984. Photo credit: Matt Patrick, USGS

Explosive eruptions at the summit of Mauna Loa: When did they occur...
April 12, 2018

Explosive eruptions at the summit of Mauna Loa: When did they occur?

This light gray block of rock (backpack for scale) is part of the approximately 830-year-old explosion deposit on the northwest rim of Moku‘āweoweo, the summit caldera of Mauna Loa. USGS photo by F.A. Trusdell.

April 1868 Mauna Loa eruption can be seen in this aerial photo
April 4, 2018

April 1868 Mauna Loa eruption can be seen in this aerial photo

Most of the lava flow (dark black) produced by the April 1868 Mauna Loa eruption can be seen in this aerial photo on the west (left) side of the prominent fault scarp, known informally as the Kahuku pali (formal names are Pali o Mamalu for the upper half and Pali‘okūlani for the lower half of the scarp). The large littoral cone that formed during the eruption, now named Pu

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Why are HVO scientists talking so much about Mauna Loa?...
February 15, 2018

Why are HVO scientists talking so much about Mauna Loa?

Mauna Loa, Earth's largest active volcano, has erupted 33 times since 1843, producing the lava flows shown in black. All of these historic eruptions started at the summit of the volcano. From there, the eruptions either stayed in the summit area or migrated down the volcano's Northeast or Southwest Rift Zones. Some Mauna Loa eruptions occurred at radial vents, indicated by

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