Time-lapse thermal image movie of Halemaumau Overlook Vent. February 8-15, 2018. Images courtesy of USGS/HVO

Time-lapse movie of Halemaumau Overlook Vent. February 8-15, 2018. Images courtesy of USGS/HVO

Time-lapse movie of Halemaʻumaʻu Overlook Vent from Hawaiian Volcano Observatory. February 8-15, 2018. Images courtesy of USGS/HVO

Time-lapse movie of KÄ«lauea Caldera from Hawaiian Volcano Observatory. February 8-15, 2018. Images courtesy of USGS/HVO

Time-lapse movie of Halemaumau Crater looking Southwest. February 8-15, 2018. Images courtesy of Hawaii Volcanoes National Park

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

This past week, KÄ«lauea Volcano’s summit lava lake level fluctuated with summit inflation and deflation, ranging about 36.5–40.5 m (120–133 ft) 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. Small-magnitude earthquakes occurred beneath the summit caldera and upper Southwest Rift Zone at depths less than 5 km (3 mi), with a few deeper earthquakes (5-13 km, 3-8 mi) beneath the volcano’s west flank. GPS and InSAR measurements continue to show slow deformation related to inflation of a magma reservoir beneath the summit and upper Southwest Rift Zone. No significant changes in volcanic gas emissions were measured.

One earthquake with three or more felt reports occurred in Hawaiʻi this past week: on February 13 at 1:01 p.m. HST, a magnitude-3.1 earthquake, 4 km (2 mi) south of Kailua-Kona and 40 km (25 mi) deep.

Please visit HVO’s website (https://volcanoes.usgs.gov/hvo) for past Volcano Watch articles, Kīlauea daily eruption updates, Mauna Loa weekly updates, volcano photos, maps, 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. February 8-15, 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. February 8-15, 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. February 8-15, 2018. Images courtesy of USGS/HVO