Alert Level: ADVISORY, Color Code: YELLOW
2018-02-15 17:49:09 UTC
HAWAIIAN VOLCANO OBSERVATORY WEEKLY UPDATE
U.S. Geological Survey
Thursday, February 15, 2018, 7:49 AM HST (Thursday, February 15, 2018, 17:49 UTC)
MAUNA LOA VOLCANO (VNUM #332020)
19°28'30" N 155°36'29" W, Summit Elevation 13681 ft (4170 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW
Activity Summary: Mauna Loa Volcano is not erupting. Rates of deformation and seismicity have not changed significantly in the past week, and persist above long-term background levels.
Observations: During the past week, only a few small-magnitude earthquakes occurred beneath the volcano, primarily on the west flank of the volcano at depths ranging from 5-13 km (3-8 miles). Additional, small earthquakes also occurred in caldera and upper Southwest Rift at depths less than 5 km (3 miles).
Global Positioning System (GPS) and Interferometric Synthetic Aperture Radar (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. Similar decreases have occurred in the past during the ongoing period of unrest; it is uncertain if these lower rates will persist or pick up again in the near future.
No significant changes in volcanic gas emissions, sulfur dioxide or carbon dioxide were measured.
For more information on current monitoring of Mauna Loa Volcano, see: https://volcanoes.usgs.gov/volcanoes/mauna_loa/monitoring_summary.html
Background: Mauna Loa is the largest active volcano on our planet, rising gradually to 4,170 m (13,681 ft) above sea level. Its long submarine flanks descend an additional 5 km (3 mi) below sea level to the ocean floor. The ocean floor directly beneath Mauna Loa is, in turn, depressed by the volcano's great mass another 8 km (5 mi). This places Mauna Loa's summit about 17 km (56,000 ft) above its base. The enormous volcano covers half of the Island of Hawaiʻi.
Mauna Loa has erupted 33 times since its first well-documented historical eruption in 1843. Its most recent eruption was in 1984.
For more information on Mauna Loa and its hazards, see the USGS Fact sheet available at:
For information on activity at Kīlauea Volcano, please see:
HVO Contact: askHVO@usgs.gov
Activity Summary also available by phone: (808) 967-8862
Lava viewing information:
Hawai'i Volcanoes National Park: https://www.nps.gov/havo/planyourvisit/lava2.htm
County of Hawaii: http://www.hawaiicounty.gov/lava-viewing/
Kalapana lava-viewing area: 808-430-1966
Subscribe to these messages: https://volcanoes.usgs.gov/vns2/
Webcam images: https://volcanoes.usgs.gov/volcanoes/kilauea/multimedia_webcams.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:
Summary of volcanic hazards from Kīlauea eruptions:
Recent Earthquakes in Hawai'i (map and list):
Explanation of Volcano Alert Levels and Aviation Color Codes:
HVO Contact: askHVO@usgs.gov
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.