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Volcano Watch: Kilauea activity update for December 1, 2016


Time-lapse movie of Halemaumau Overlook Vent. November 24-December 1, 2016. Images courtesy of USGS/HVO


Time-lapse thermal image movie of Halemaumau Overlook Vent. November 24-December 1, 2016. Images courtesy of USGS/HVO


Time-lapse movie of Halemaʻumaʻu Overlook Vent from Hawaiian Volcano Observatory. November 24-December 1, 2016. Images courtesy of USGS/HVO


Time-lapse movie of Kīlauea Caldera from Hawaiian Volcano Observatory. November 24-December 1, 2016. Images courtesy of USGS/HVO


Time-lapse movie of Halemaumau Crater looking Southwest. November 24-December 1, 2016. Images courtesy of Hawaii Volcanoes National Park

(Activity updates are written by scientists at the U.S. Geological Survey’s Hawaiian Volcano Observatory.)

Kīlauea continues to erupt at its summit and East Rift Zone. This past week, the summit lava lake level varied between about 6.5 and 20 m (21–66 ft) below the vent rim. The 61g lava flow continued to enter the ocean near Kamokuna. On Dec. 1, a new breakout from the 61g vent area on the flank of Pu‘u ‘Ō‘ō sent a small surface flow to the east, on top of existing 61g flows. The 61g lava flows do not pose an immediate threat to nearby communities.

Mauna Loa is not erupting. During the past week, about a dozen small earthquakes occurred primarily northwest of the summit caldera at depths between 5 and 13 km (3–8 miles). Deformation related to inflation of a magma reservoir beneath the summit and upper Southwest Rift Zone continues, with inflation occurring mainly in the southwestern part of the magma storage complex.

No earthquakes were reported felt on the Island of Hawaiʻi this past week.

Please visit the HVO website (hvo.wr.usgs.gov) for past Volcano Watch articles, Kīlauea daily eruption updates, Mauna Loa weekly updates, volcano photos, recent earthquakes info, and more; call for summary updates at 808-967-8862 (Kīlauea) or 808-967-8866 (Mauna Loa); email questions to askHVO@usgs.gov


Time-lapse movie of Pu’u ‘O’o Crater East Flank. November 21-December 1, 2016. Images courtesy of USGS/HVO


Time-lapse image movie from a research camera positioned on Holei Pali, looking east towards Lava Flow 61G and Kalapana. November 24-December 1, 2016. Images courtesy of USGS/HVO

This map shows recent changes to Kīlauea’s East Rift Zone lava flow field. The area of the active flow field as of November 3 is shown in pink, while widening and advancement of the active flow as of November 29 is shown in red. The new flow branch east of Puʻu ʻŌʻō started from a breakout at the episode 61g vent on November 21. Older Puʻu ʻŌʻō lava flows (1983–2016) are shown in gray. The yellow lines (dashed where uncertain) show the mapped trace of lava tubes as determined from aerial thermal imaging and ground mapping.  The blue lines over the Puʻu ʻŌʻō flow field are steepest-descent paths calculated from a 2013 digital elevation model (DEM), while the blue lines on the rest of the map are steepest-descent paths calculated from a 1983 DEM (for calculation details, see http://pubs.usgs.gov/of/2007/1264/). Steepest-descent path analysis is based on the assumption that the DEM perfectly represents the earth's surface. DEMs, however, are not perfect, so the blue lines on this map can be used to infer only approximate flow paths. The base map is a partly transparent 1:24,000-scale USGS digital topographic map draped over the 1983 10-m digital elevation model (DEM).

This map shows recent changes to Kīlauea’s East Rift Zone lava flow field. The area of the active flow field as of November 3 is shown in pink, while widening and advancement of the active flow as of November 29 is shown in red. The new flow branch east of Puʻu ʻŌʻō started from a breakout at the episode 61g vent on November 21. Older Puʻu ʻŌʻō lava flows (1983–2016) are shown in gray. The yellow lines (dashed where uncertain) show the mapped trace of lava tubes as determined from aerial thermal imaging and ground mapping.
The blue lines over the Puʻu ʻŌʻō flow field are steepest-descent paths calculated from a 2013 digital elevation model (DEM), while the blue lines on the rest of the map are steepest-descent paths calculated from a 1983 DEM (for calculation details, see pubs.usgs.gov/of/2007/1264/). Steepest-descent path analysis is based on the assumption that the DEM perfectly represents the earth’s surface. DEMs, however, are not perfect, so the blue lines on this map can be used to infer only approximate flow paths. The base map is a partly transparent 1:24,000-scale USGS digital topographic map draped over the 1983 10-m digital elevation model (DEM).

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Dec 2, 2016 / 5:15 pm

 

 

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