Volcano Watch: Kilauea activity update for April 19, 2018


Time-lapse thermal image movie of Halemaumau Overlook Vent. April 12-19, 2018. Images courtesy of USGS/HVO


Time-lapse movie of Halemaumau Overlook Vent. April 12-19, 2018. Images courtesy of USGS/HVO


Time-lapse movie of Halemaʻumaʻu Overlook Vent from Hawaiian Volcano Observatory. April 12-19, 2018. Images courtesy of USGS/HVO


Time-lapse movie of Kīlauea Caldera from Hawaiian Volcano Observatory. April 12-19, 2018. Images courtesy of USGS/HVO

(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, ranging about 10–31 m (33–102 ft) below the vent rim. 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. A dozen 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.

One earthquake with three or more felt reports occurred on the Island of Hawaiʻi this past week: a magnitude-2.7 earthquake 5 km (3 mi) southwest of Volcano at 1.0 km (0.6 mi) depth on April 15, at 7:01 a.m. HST.


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 12-19, 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 12-19, 2018. Images courtesy of USGS/HVO

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