Volcano Activity Update: Feb. 22, 2018

February 23, 2018, 12:35 PM HST (Updated February 23, 2018, 12:37 PM)
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Visitors enjoy a view the summit eruption from Kīlauea Volcano’s Halema‘uma‘u Crater from a new vantage point just south of Jaggar Museum. The viewing area was funded by entrance fee revenue, and enhances visitor experience at the park’s most popular destination. PC: NPS/Janice Wei.

This past week, Kīlauea Volcano’s summit lava lake level fluctuated with summit inflation and deflation, ranging about 102 to 130 feet below the vent rim. On the East Rift Zone, the 61g lava flow remained active downslope of Pu‘u ‘Ō‘ō, with scattered breakouts on the pali and coastal plain, but no ocean entry. The 61g flows do not pose an immediate threat to nearby communities.

Mauna Loa Volcano is not erupting. A few small-magnitude earthquakes occurred beneath the volcano, primarily on its west flank, at depths ranging three to eight miles. Two small earthquakes also occurred near Mauna Loa’s summit at depths less than three miles. GPS and InSAR measurements continue to show slow deformation related to inflation of a magma reservoir beneath the summit and upper Southwest Rift Zone. Rates of inflation in the past few months have decreased compared to rates of the past year. It is uncertain if these lower rates will persist or pick up again in the near future. No significant changes in volcanic gas emissions were measured.

One earthquake with three or more felt reports occurred in Hawaiʻi this past week: a magnitude-3.2 earthquake, eight miles southwest of Volcano and 19 miles deep on Feb. 20 at 8:58 p.m. HST.

Please visit HVO’s website for past Volcano Watch articles, Kīlauea daily eruption updates, Mauna Loa weekly updates, volcano photos, maps, recent earthquakes info, and more.

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The “Hawai‘i Volcano Activity Update” is a weekly article written by U.S. Geological Survey Hawaiian Volcano Observatory scientists and affiliates.

Call for summary updates at (808) 967-8862 (Kīlauea) or (808) 967-8866 (Mauna Loa); email questions to [email protected].

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