Volcano Watch: Kilauea activity update for April 26, 2018


Time-lapse thermal image movie of Halemaumau Overlook Vent. April 19-26, 2018. Images courtesy of USGS/HVO


Time-lapse movie of Halemaumau Overlook Vent. April 19-26, 2018. Images courtesy of USGS/HVO


Time-lapse movie of Kīlauea Caldera from Hawaiian Volcano Observatory. April 19-26, 2018. Images courtesy of USGS/HVO


This video shows an overview of the lake from the Halema‘uma‘u Crater rim, as well as some of the spattering that was occurring on the lake margin on Sunday, April 22. Video taken Sunday, April 22, 2018 courtesy of U.S. Geological Survey

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

This past week, Kīlauea Volcano’s summit lava lake level fluctuated with summit inflation and deflation, eventually rising high enough to overflow onto the floor of Halemaʻumaʻu multiple times beginning Saturday, April 21. On the East Rift Zone, the 61g lava flow remained active with breakouts on the upper part of the flow field. There were no active lava flows on the pali, coastal plain, or entering the ocean. The 61g flows do not pose an immediate threat to nearby communities.

Mauna Loa is not erupting. Rates of deformation and seismicity have not changed significantly over the past week. Few small-magnitude earthquakes occurred beneath the summit and upper flanks of the volcano, primarily at depths shallower than 5 km (3 mi). GPS and InSAR measurements indicate slowing deformation related to inflation of a magma reservoir beneath the summit and upper Southwest Rift Zone.

Two earthquakes with three or more felt reports occurred in Hawaii this past week: a magnitude-2.7 earthquake 3 km (2 mi) northwest of Keokea at 28.0 km (17.4 mi) depth on April 21 at 3:34 p.m. HST and a magnitude-3.2 earthquake 5 km (3 mi) south of Volcano at 1.8 km (1.1mi) depth inside Hawai`i Volcanoes National Park on April 26 at 1:08 p.m. HST.


Time-lapse movie of Pu’u ‘O’o Crater. April 19-26, 2018. Images courtesy of USGS/HVO


Time-lapse movie from a camera positioned on the southeast flank of Puʻu ʻŌʻō, looking toward the active flow advancing to the southeast. The breakout point is at the left edge of the image, and the mid-field skyline at the right is roughly coincident with the top of the pali. April 19-26, 2018. 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. April 19-26, 2018. Images courtesy of USGS/HVO

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