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Thomas Jaggar and his wife, Isabel, hiking on Mauna Loa during the ...
December 7, 2012

Thomas Jaggar and his wife, Isabel, hiking on Mauna Loa during the ...

Thomas Jaggar and his wife, Isabel, hiking on Mauna Loa during the September 1919 Southwest Rift Zone eruption.

The summit of Mauna Loa (left) rises above the vog layer on the lee...
November 10, 2012

The summit of Mauna Loa rises above the vog layer on the leeward si...

The summit of Mauna Loa (left) rises above the vog layer on the leeward side of the Island of Hawai‘i in November 2012. The flank of Hualālai is visible at right.

Color photograph showing the summit of a volcano above volcanic gas interacting with the atmosphere
November 10, 2012

Summit of Mauna Loa above vog in November 2012

The summit of Mauna Loa (left) rises above the vog layer on the leeward side of the Island of Hawai‘i in November 2012. The flank of Hualālai is visible at right.

Mauna Loa looms behind HVO and Jaggar Museum...
March 6, 2012

Mauna Loa looms behind HVO and Jaggar Museum

The Hawaiian Volcano Observatory and Jaggar Museum, shown in this photo, sit atop the summit of Kīlauea Volcano. The snow-capped summit of Mauna Loa, nearly 10,000 feet higher than Kīlauea, looms in the background.

Mauna Loa looms behind HVO and Jaggar Museum...
March 6, 2012

Mauna Loa looms behind HVO and Jaggar Museum

The Hawaiian Volcano Observatory and Jaggar Museum, shown in this photo, sit atop the summit of Kīlauea Volcano. The snow-capped summit of Mauna Loa, nearly 10,000 feet higher than Kīlauea, looms in the background.

Erupting vents on Mauna Loa's northeast rift zone near Pu‘u ‘Ula‘ul...
February 6, 2012

Erupting vents on Mauna Loa's northERZ near Pu‘u ‘Ula‘ula (Red Hill...

Erupting vents on Mauna Loa's northeast rift zone near Pu‘u ‘Ula‘ula (Red Hill) on March 25, 1984, sent massive ‘A‘ā lava flows down the rift toward Kulani.

Spectacular views of Mauna Loa's Southwest and Northeast Rift Zones...
May 23, 2011

Spectacular views of Mauna Loa's Southwest and NorthERZs

View looking up Mauna Loa's spectacular Southwest Rift Zone. Pu‘u o Keokeo fills the lower half of the photo. The black lava beyond is mostly from 1916 and 1926. The summit of Mauna Loa is in the background.

View from just below the summit of Mauna Loa looking back down the ...
May 23, 2011

View from just below the summit of Mauna Loa looking back down the ...

View from just below the summit of Mauna Loa looking back down the Southwest Rift. The Sulfur Cone is the white area just above center frame. Pu‘u o Keokeo is the barely visible bump just above Sulfur Cone at the crest of the Southwest Rift.

View looking downslope at the various cones that dot Mauna Loa's No...
May 23, 2011

View looking downslope at the various cones that dot Mauna Loa's No...

View looking downslope at the various cones that dot Mauna Loa's Northeast Rift Zone. The edge of North Pit, on the north side of Moku‘āweoweo, is in the foreground.

View from above Mauna Loa's upper Northeast Rift Zone looking acros...
May 23, 2011

Mauna Loa looking across an unnamed cone toward Mauna Kea

View from above Mauna Loa's upper Northeast Rift Zone looking across an unnamed cone toward Mauna Kea.

The high point of Mauna Loa, in the background at an elevation of a...
May 23, 2011

The high point of Mauna Loa, in the background at an elevation of a...

The high point of Mauna Loa, in the background at an elevation of about 13,679 ft, is actually just the highest point along the rim of the steep cliffs that surround Mauna Loa's summit caldera, Moku‘āweoweo, Dark-colored lava flows of recent vintage (1984) cover the floor of Moku‘āweoweo. View is looking southwest.

This view of Mauna Loa's summit is looking toward the northeast. Th...
May 23, 2011

This view of Mauna Loa's summit is looking toward the NE. The east ...

This view of Mauna Loa's summit is looking toward the northeast. The east flank of Mauna Kea is to the left, and North Pit, on the northeast end of Moku‘āweoweo, is straight ahead.