Tag Archive | "usgs"

Left: Horseshoe-shaped crater of Mount St. Helens in 1980, formed by a landslide that removed the top of the volcano. The crater is about 2 km (1.2 mi) wide and the floor is about 600 m (1,970 ft) below the crater rim. Right: Halema‘uma‘u nestled in the summit crater of Kīlauea Volcano on August 1, the day before the last collapse event. The Hawaiian Volcano Observatory building is visible at far right. USGS photos.

Volcano Watch: Volcano collapses mark the beginning and end of USGS scientist’s career

Steven Brantley’s 37-year stint with the USGS—16 years at the Cascades Volcano Observatory and 21 at the Hawaiian Volcano Observatory—ends this month.

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This comparison shows the area of Kapoho before and after. Kapoho Crater is in the left portion of the image. Lava filled much of the crater, including the small nested crater that contained Green Lake. The Kapoho Beach Lots subdivision is in the right side of the image, north of Kapoho Bay, and was completely covered by the fissure 8 lava flow. Vacationland Hawai‘i, in the lower right corner of the image, was also completely covered, along with the adjacent tide pools. Kapoho Farm Lots, near the center of the image, is also beneath the flow. For a map of the 2018 lower East Rift Zone eruption fissures and surrounding area, see the HVO web site

Volcano Watch: Kilauea activity update for October 4, 2018

Active lava has not been seen within the fissure 8 cone since September 5, and the high rates of seismicity and deflationary deformation at the summit stopped abruptly on August 4.

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On the right, a tiltmeter is ready for installation in a shallow borehole. On the left, the tiltmeter is located at the bottom of a 3 to 4 m (10 to 15 ft) borehole lined with a metal casing. The tiltmeter is surrounded by sand to secure it within the borehole so that it does not touch the casing. USGS photos.

Volcano Watch: Tiltmeters measure tiny changes that can have big consequences

The USGS Hawaiian Volcano Observatory (HVO) uses a diverse set of instruments to monitor active volcanoes in Hawaii.

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Fissure 8 cone. September 27, 2018.

Volcano Watch: Kilauea activity update for September 27, 2018

At Kīlauea’s lower East Rift Zone, the most recent significant incandescence visible within the fissure 8 cone was on September 15. At the summit of the volcano, seismicity and ground deformation remain low.

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South side of Halemaʻumaʻu at the summit of Kīlauea Volcano, showing a short section of Hawaiʻi Volcanoes National Park’s Crater Rim Drive (arrow) preserved on a block of the former caldera floor that has dropped down about 80 m (260 ft). Thinly bedded Kīlauea explosion deposits (E) from 16th-18th centuries are overlain by 19th and 20th century lava flows in the wall of Halemaʻumaʻu. USGS photo by D. Swanson.

Volcano Watch: Will this summer’s limited collapse of Kīlauea caldera eventually widen?

Putting together the evidence for such events is complicated, time-consuming, field-oriented research, but it paid dividends at Kīlauea by recognizing the large-scale cyclic behavior of the volcano during the past 2,500 years.

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Volcano Watch: Kilauea activity update for September 20, 2018

The combined sulfur dioxide emission rates at Kīlauea’s summit, Puʻu ʻŌʻō, and lower East Rift Zone remain at less than 1,000 tonnes per day—lower than at any time since late 2007.

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Volcano Watch: Seismic array deployed to better understand magma transport during Kīlauea’s eruption

In June, the University of Utah, in conjunction with the USGS Hawaiian Volcano Observatory installed a dense array of seismometers on the summit and lower East Rift Zone of Kīlauea.

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Volcano Watch: Kilauea activity update for September 13, 2018

Since the beginning of September, small lava flows have been observed within the fissure 8 cone, but none have extended outside the walls of the cone.

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Volcano Watch: Scientists share lessons from Kīlauea at “Cities on Volcanoes” conference

The international volcanology community came together in one of the world’s greatest cities threatened by volcanic activity—Naples, Italy—to share lessons learned and to work together.

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Volcano Watch: Kilauea activity update for September 6, 2018

At Kīlauea’s lower East Rift Zone, lava intermittently erupted within the fissure 8 cone, but no lava flowed beyond the spillway. Residents in the lower Puna and Kīlauea summit areas should stay informed and heed Hawaii County Civil Defense alerts.

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Weak lava activity starting to fill the floor of Fissure 8 Monday (Sept 3)

On the Kilauea volcano’s lower East Rift Zone, the crew on this morning’s overflight confirmed that weakly active lava continues to fill the deep crater in the fissure 8 cone with no lava extending outside

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Volcano Watch: Kilauea activity update for August 30, 2018

At Kīlauea’s lower East Rift Zone, no incandescence was visible in the fissure 8 cone and no lava was entering the ocean as of August 30, 2018.

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Volcano Watch: Scientific community lends a hand to measure Kīlauea’s changing shape

The USGS Hawaiian Volcano Observatory (HVO) has an extensive network of instruments that helps us monitor how the ground deforms due to magma moving underground.

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Volcano Watch: Kilauea activity update for August 23, 2018

Activity on Kīlauea’s lower East Rift Zone and at the summit of the volcano remains greatly diminished as of August 23.

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