Photo and Video Chronology - Mauna Loa - September 21, 2008

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Comparative views of the 1949 cinder-and-spatter and 1940 vent cones.

Comparative views of the 1949 cinder-and-spatter and 1940 vent cones

Comparative views of the 1949 cinder-and-spatter and 1940 vent cone...

The 1949 cinder-and-spatter cone (left) and 1940 spatter cone (right) as seen from the floor of Mauna Loa's summit caldera, looking to the southwest. Pāhoehoe flows in the foreground were erupted in 1984.

(Public domain.)

Close-up of the 1949 cinder-and-spatter cone as seen from the floor...

Close-up of the 1949 cinder-and-spatter cone as seen from the floor of Moku‘āweoweo, Mauna Loa's summit caldera. Pāhoehoe lava visible in the foreground (lower half of photo) was erupted in 1940. Beyond these flows, you can see pāhoehoe flows, spatter, and tephra erupted in 1949.

(Public domain.)

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

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).

(Public domain.)

The 1940 cinder-and-spatter cone as seen from the caldera floor loo...

The 1940 cinder-and-spatter cone as seen from the caldera floor looking to the southeast. This cone, which is about 114 m (373 feet) high, was built around the vent as lava spewed from it over a period of 134 days. The dark-colored pāhoehoe flows visible in the foreground were erupted in 1984. Rocky debris on top of the 1984 flows is from small collapses of the steep caldera walls. The largest boulder is about 1 m (3 feet) long.

(Public domain.)

A close-up view of the 1984 fissure that cut through the southwest ...

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.

(Public domain.)

Aerial view of Mauna Loa's upper northeast rift zone near the area ...

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.

(Public domain.)