HVO Status Report 20180809_0906

Subject: HVO Status Report 20180809_0906

HAWAIIAN VOLCANO OBSERVATORY STATUS REPORT
U.S. Geological Survey
Thursday, August 9, 2018, 9:06 AM HST (Thursday, August 9, 2018, 19:06 UTC)

KILAUEA VOLCANO (VNUM #332010)

19°25’16” N 155°17’13” W, Summit Elevation 4091 ft (1247 m)
Current Volcano Alert Level: WARNING
Current Aviation Color Code: ORANGE

Kīlauea Volcano Lower East Rift Zone

Activity and lava output from Fissure 8 remains low and there have been no signs of reactivation or new intrusion. Up-rift of Fissure 8, Fissures 9, 10, and 24, and down-rift Fissures 13, 23, 3, 21 and 7, continue to steam. Ground crews and overflights continue to monitor these for signs of new activity. This morning’s overflight crew observed a crusted lava pond deep inside the steaming cone at a level significantly lower than when viewed Tuesday morning.

The significance of this change is not yet clear and hazardous conditions remain in the area. HVO field crews and the UAS team will monitor activity throughout the day and overnight.

It is common for eruptions to wax and wane or pause completely. A return to high levels of lava discharge or new outbreaks in the area of active fissures could occur at any time.

Residents should remain informed and heed Hawaii County Civil Defense messages and warnings.

Kīlauea Volcano Middle East Rift Zone

Gas measurements of the Puʻu ʻŌʻō plume taken on August 6 and 7 indicated a reduced SO2 emission rate lower than the August 3 measurement and similar to what has been observed over the past three months. No active lava was observed in the crater on an overflight on August 6th. This morning, the steam plume appears wispy and intermittent.

A magnitude-4.4 earthquake occurred southeast of Puʻu ʻŌʻō this morning at 6:50 a.m. The earthquake had no significant effect on the status of Kīlauea activity except to generate a brief dust plume from Puʻu ʻŌʻō several minutes later.

Kīlauea Volcano Summit

The volcano’s summit remains quiet, except for the small occasional rockfall, following the most recent collapse at 11:55 a.m. HST August 2nd. This continues a significant departure from the pattern of seismicity and deformation over the past several months, with very low rates of seismicity continuing today. Except for a very gradual deflation, the deformation at the summit as measured by tiltmeter and GPS instruments has stopped.

Summit and LERZ changes considered together imply that the rate of magma leaving the summit to feed the lower East Rift Zone eruption has significantly decreased. How long this condition will persist is unknown. It is possible that outflow will pick up again, resulting in renewed summit area deflation leading to another collapse event and renewed eruption vigor on the LERZ.

HVO will continue to monitor Kīlauea closely for any signs of change in activity.

The next status report will be issued tomorrow morning unless significant changes occur.

MORE INFORMATION

Subscribe to these messages: https://volcanoes.usgs.gov/vns2/

Webcam images: https://volcanoes.usgs.gov/volcanoes/kilauea/multimedia_webcams.html

Photos/Video: https://volcanoes.usgs.gov/volcanoes/kilauea/multimedia_chronology.html

Lava Flow Maps: https://volcanoes.usgs.gov/volcanoes/kilauea/multimedia_maps.html

Definitions of terms used in update: https://volcanoes.usgs.gov/volcanoes/kilauea/extra/definitions.pdf

Overview of Kīlauea summit (Halemaʻumaʻu) and East Rift Zone (Puʻu ʻŌʻō ) eruptions:
https://volcanoes.usgs.gov/volcanoes/kilauea/extra/background.pdf

Summary of volcanic hazards from Kīlauea eruptions:
https://volcanoes.usgs.gov/volcanoes/kilauea/extra/hazards.pdf

Recent Earthquakes in Hawai’i (map and list):
https://volcanoes.usgs.gov/hvo/earthquakes/

Explanation of Volcano Alert Levels and Aviation Color Codes:
https://volcanoes.usgs.gov/activity/alertsystem/index.php
https://pubs.usgs.gov/fs/2006/3139/

CONTACT INFORMATION:

askHVO

The Hawaiian Volcano Observatory is one of five volcano observatories within the U.S. Geological Survey and is responsible for monitoring volcanoes and earthquakes in Hawai`i.

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