Images

Lava from the Pu'u 'Ō'ō-Kupaianaha eruption, active since 1983, enters the ocean on the south flank of Kīlauea Volcano.

The degassing lava lake within Halema‘uma‘u at the summit of Kīlauea was a fitting backdrop in 2009 for USGS Hawaiian Volcano Observatory geologist Janet Babb, who later co-produced a video about the summit eruption.

Vog obscures view during slack or no tradewinds at the summit of Kīlauea Volcano, Hawai‘i

Side-by-side comparison of the northwest wall of Kīlauea Caldera on a clear day (left) and a day with thick vog (right). HVO observation tower and building can be seen near the center in each photo.

HVO geologist downloads images collected with infrared cameras set up on the rim of Halema‘uma‘u Crater. The cameras are aimed at an erupting lava lake to conduct a thermal survey of the lake's surface.

The Hawaiian Volcano Observatory, the first volcano observatory in the United States, is located on the west rim of Kīlauea Volcano's summit caldera in Hawai‘i Volcanoes National Park. A volcanic gas plume rises from a vent that opened in 2008 at the base of the south wall of Halema‘uma‘u Crater. Crater Rim Drive in foreground.

The Hawaiian Volcano Observatory perched on the west rim of Kīlauea Volcano's summit caldera, overlooks Halema‘uma‘u Crater, where a new vent that opened in March 2008 emits a volcanic gas plume.

The U.S. Geological Survey's Hawaiian Volcano Observatory, the first volcano observatory in the United States, is located on the west rim of Kīlauea Volcano's summit caldera in Hawai‘i Volcanoes National Park. A volcanic gas plume rises from a vent that opened in 2008 at the base of the south wall of Halema‘uma‘u Crater. Crater Rim Drive in foreground.

The USGS Hawaiian Volcano Observatory (foreground) is located on the caldera rim of Kilauea Volcano, Hawai'i—the most active volcano in the world.  The observatory's location provides an excellent view of summit eruptive activity, which began in 2008.

The USGS Hawaiian Volcano Observatory (foreground) is located on the caldera rim of Kilauea Volcano, Hawai'i—the most active volcano in the world.  The observatory's location provides an excellent view of summit eruptive activity, which began in 2008.

Incandescent arcs trace the path of lava fragments cast out during a tephra-jet explosion at the Waikupanaha ocean entry in 2008. This is a relatively small explosion, reaching a few tens of meters (yards) height, while one earlier in the day was nearly 70 meters (230 ft) in height.

When lava from the Pu'u 'Ō'ō-Kupaianaha eruption, active since 1983, meets the ocean, large littoral explosions can result.

Clear day during tradewind conditions at the summit of Kīlauea Volcano, Hawai‘i

Gas plume rising from Halema‘uma‘u Crater, Kīlauea Volcano, Hawai‘i

Volcanic-gas plume rises from Halema‘uma‘u Crater, Kīlauea Volcano, Hawai‘i

A plume of volcanic gases (chiefly water vapor, carbon dioxide, and sulfur dioxide), tiny lava and rock particles, and droplets drifts southwest in the tradewinds from Halema‘uma‘u Crater.

U.S. Geological Survey's Hawaiian Volcano Observatory perched on the rim of Kīlauea Volcano's summit caldera, Hawai‘i

Close view of the USGS Hawaiian Volcano Observatory (right, with viewing tower) and National Park Service Jaggar Museum and overlook (left) on Kīlauea Volcano's caldera rim. At least three fault blocks can be seen below the observatory, which developed when Kīlauea's summit collapsed about 500 years ago to form the present-day caldera.

This section of Crater Rim Drive in Hawai‘i Volcanoes National Park was closed in February 2008 because of the high concentration of volcanic gas blowing across the road from Halema‘uma‘u Crater by prevailing trade winds. The concentration of sulfur dioxide gas in this area is considered hazardous to human health.

Volcanic-gas plume rises from Halema‘uma‘u Crater as seen from the Jaggar Museum (Hawai‘i Volcanoes National Park) viewing area next to the U.S. Geological Survey's Hawaiian Volcano Observatory.

Volcanic gas plume rises from Halema‘uma‘u Crater, Kīlauea Volcano, Hawai‘i