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Volcano Activity Update: June 15, 2017

Posted June 17, 2017, 04:51 PM HST
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Left: The episode 61g flow continues to enter the ocean and build the delta at the Kamokuna ocean entry. Small streams of lava along the front of the delta interact with the ocean and produce a large steam plume and occasional littoral bursts. There were no large delta cracks visible, but a surface flow covering part of the delta (silver lava) could have covered any in the area. USGS/HVO photo.

This past week, Kīlauea Volcano’s summit lava lake fluctuated in concert with summit inflation and deflation, with levels ranging around 43 to 126 feet below the vent rim.

On the East Rift Zone, the 61g flow remained active, with lava entering the ocean near Kamokuna and scattered surface breakouts downslope of Pu‘u ‘Ō‘ō.

These flows do not pose an immediate threat to nearby communities.

Mauna Loa is not erupting. Rates of deformation and seismicity have not changed significantly this past week, but persist above long-term background levels.

GPS measurements continue to show 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.

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During the past week, only a few small-magnitude earthquakes occurred beneath the volcano, primarily in the south caldera and upper Southwest Rift Zone at depths less than 3 miles. A small number of earthquakes also occurred on the west flank of the volcano at depths of 0 to 8 miles.

Two earthquakes were reported felt on the Island of Hawaiʻi during the past week:

  • On June 12, 2017, at 8:42 p.m. HST, a magnitude-2.3 earthquake occurred 2.5 miles southeast of Leilani Estates at 1.7 miles depth.
  • On June 11, at 08:22 a.m., a magnitude-2.8 earthquake occurred 8 miles southwest of Captain Cook at 7.5 miles depth.

The 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 askHVO@usgs.gov.

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