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This view of Mauna Loa's 1940 vent cone, looking to the southwest, ...
May 23, 2011

This view of Mauna Loa's 1940 vent cone, looking to SW, shows a fis...

This view of Mauna Loa's 1940 vent cone, looking to the southwest, shows a fissure that bisected it during the 1984 eruption (crack on the right side of the cone). pāhoehoe flows and spatter erupted from the 1984 fissure blanket the caldera floor northwest of the cone (foreground).

A close-up view of the 1984 fissure that cut through the southwest ...
May 23, 2011

1984 fissure that cut through the SW side of Mauna Loa's 1940 vent ...

A close-up view of the 1984 fissure that cut through the southwest side of Mauna Loa's 1940 vent cone. The crack on the right side of the cone is the 1984 fissure.

Aerial view of Mauna Loa's upper northeast rift zone near the area ...
May 23, 2011

Mauna Loa's upper northERZ near area where it intersects Moku‘āweow...

Aerial view of Mauna Loa's upper northeast rift zone near the area where it intersects Moku‘āweoweo, the summit caldera. pāhoehoe flows visible in the foreground were erupted in 1942. Distant steep cliffs (right background) are the west wall of the summit caldera.

Spectacular views of the summit caldera of Mauna Loa...
May 23, 2011

Spectacular views of the summit caldera of Mauna Loa

A view of Moku‘āweoweo, the summit caldera of Mauna Loa, as seen from South Pit (looking to the north-northwest). An eruption in 1940 created the cinder-and-spatter cone visible on the caldera floor (right center). This cone, which is about 114 m (373 feet) high, is the largest cone at Mauna Loa's summit. The cone on the southwest rim of the caldera (left center) was built

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This aerial view of Mauna Loa's summit shows the cinder-cone and la...
May 23, 2011

This Mauna Loa's summit shows the cinder-cone and lava flows that w...

This aerial view of Mauna Loa's summit shows the cinder-cone and lava flows that were erupted in 1949. The crack extending down the left side of the cone is the northeast-southwest trending 1984 fissure that bisected the southwest flank of the cone during the initial phase of the eruption. Light-brown tephra erupted from the 1949 cone thins to the west. The steep caldera

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An aerial view of the 1940 cinder-and-spatter cone on the floor of ...
May 23, 2011

An the 1940 cinder-and-spatter cone on the floor of Mauna Loa's sum...

An aerial view of the 1940 cinder-and-spatter cone on the floor of Mauna Loa's summit caldera as seen from the southeast. The west wall of the caldera (background) is about 170 m (560 feet) high. Most of the caldera floor around the cone is covered by lava flows erupted in 1984.

Mauna Loa rumbled and stretched as it awakened from a 25-year slumb...
July 16, 2010

Mauna Loa rumbled and stretched as it awakened from a 25-year slumber

On July 6, 1975, eruptive fissures opened along Mauna Loa

Mauna Loa rumbled and stretched as it awakened from a 25-year slumb...
July 16, 2010

Mauna Loa rumbled and stretched as it awakened from a 25-year slumber

Lava fountains up to 20 m (65 ft) high erupted from fissures on the north flank of Mauna Loa early Sunday morning, July 6, 1975. USGS photo.

1940 was a momentous year for Mauna Loa - and for Thomas A. Jaggar ...
June 11, 2010

1941 was a momentous year for Mauna Loa - and for Thomas A. Jaggar

Lava fountains erupt from a fissure in the southwestern part of Moku`aeoweo, Mauna Loa's summit caldera, on April 11, 1940 (view looking to the south-southeast). Patches of white snow cling to the caldera walls as fluid pahoehoe lava flows spread across

Low lava fountains from 1984 Mauna Loa "2,900-m vents" signaled dec...
April 8, 1984

Low lava fountains from 1984 Mauna Loa "2,900-m vents" signaled dec...

Lava production from these "2,900-m vents" began to decrease in late March but declined most rapidly between April 7 and 9 from about 300,000 m3 per hour to less than 100,000 m3 per hour. Photo taken at 9:09 a.m.

Lava flows from the 1984 eruption of Mauna Loa loom above the town ...
April 4, 1984

Lava flows from the 1984 eruption of Mauna Loa loom above the town ...

Lava flows from the 1984 eruption of Mauna Loa loom above the town of Hilo. Photograph taken near the Hilo airport on April 4.