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Alert Level: NORMAL, Color Code: GREEN
2019-01-03 02:35:13 UTC





HAWAIIAN VOLCANO OBSERVATORY MONTHLY UPDATE
U.S. Geological Survey
Wednesday, January 2, 2019, 4:35 PM HST (Thursday, January 3, 2019, 02:35 UTC)


During the lapse in appropriations, HVO continues to maintain monitoring networks and issue updates and notifications of volcanic activity. Volcano monitoring data will continue to be available on the HVO website. Some website content will not be updated and information may become outdated. More information is available at https://www.doi.gov/shutdown.

MAUNA LOA VOLCANO (VNUM #332020)
19°28'30" N 155°36'29" W, Summit Elevation 13681 ft (4170 m)
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN

No significant changes in earthquake activity were detected in December. Small events continued in long-active areas including beneath the northwest flank and summit caldera. The largest earthquake for Mauna Loa in December was a M2.6 event at a depth of 8 km or 4 mi. USGS received two felt-reports following this event.

Data from GPS instruments on Mauna Loa indicate possible slow inflation of a summit magma reservoir system. The rates of deformation are lower than during the period of more intense unrest from 2014 - 2017.

HVO continues to monitor the volcano closely and we will issue our next update in one month, or earlier should conditions change signficantly.


Background: Mauna Loa is the largest active volcano on Earth. Eruptions typically start at the summit and, within minutes to months of eruption onset, about half of the eruptions migrate into either the Northeast or Southwest Rift Zones. Since 1843, the volcano has erupted 33 times with intervals between eruptions ranging from months to decades. Mauna Loa last erupted 34 years ago, in 1984.

Mauna Loa eruptions tend to produce voluminous, fast-moving lava flows that can impact communities on the east and west sides of the Island of Hawai`i. Since the mid-19th century, the city of Hilo in east Hawai'i has been threatened by seven Mauna Loa lava flows. Mauna Loa lava flows have reached the south and west coasts of the island eight times: 1859, 1868, 1887, 1926, 1919, and three times in 1950.

From 2014 through much of 2017, HVO seismic stations recorded variable, but overall elevated rates of shallow, small-magnitude earthquakes beneath Mauna Loa's summit, upper Southwest Rift Zone, and west flank. During that same time period, HVO measured ground deformation consistent with input of magma into the volcano's shallow magma storage system.


This notice contains additional volcanoes not displayed: Hualalai (NORMAL/GREEN), Mauna Kea (NORMAL/GREEN), Haleakala (NORMAL/GREEN), Lo`ihi (UNASSIGNED/UNASSIGNED).

MORE INFORMATION

Activity summary also available by phone: (808) 967-8862

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 Hawaiʻi (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@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 Hawaiʻi.



HAWAIIAN VOLCANO OBSERVATORY MONTHLY UPDATE
U.S. Geological Survey
Friday, December 7, 2018, 5:16 PM HST (Saturday, December 8, 2018, 03:16 UTC)


MAUNA LOA VOLCANO (VNUM #332020)
19°28'30" N 155°36'29" W, Summit Elevation 13681 ft (4170 m)
Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN

No significant changes in earthquake activity were detected in November. Most of the Mauna Loa activity were located at the typical areas: beneath the northwest flank and summit caldera. Mauna Loa had a short-lived period of elevated seismic activity that lasted about four hours on 2018-11-18 UTC (mid-afternoon to evening, 2018-11-17 HST). Most of the swarm earthquakes were located at 5-6 km (model) depth, beneath the northwest flank of the volcano. The largest earthquake for Mauna Loa in November was a M2.9, which occurred during the swarm.

There was no significant change in deformation trends across the volcano in November.

HVO continues to monitor the volcano closely.


Background: Mauna Loa is the largest active volcano on Earth. Eruptions typically start at the summit and, within minutes to months of eruption onset, about half of the eruptions migrate into either the Northeast or Southwest Rift Zones. Since 1843, the volcano has erupted 33 times with intervals between eruptions ranging from months to decades. Mauna Loa last erupted 34 years ago, in 1984.

Mauna Loa eruptions tend to produce voluminous, fast-moving lava flows that can impact communities on the east and west sides of the Island of Hawai`i. Since the mid-19th century, the city of Hilo in east Hawai'i has been threatened by seven Mauna Loa lava flows. Mauna Loa lava flows have reached the south and west coasts of the island eight times: 1859, 1868, 1887, 1926, 1919, and three times in 1950.

From 2014 through much of 2017, HVO seismic stations recorded variable, but overall elevated rates of shallow, small-magnitude earthquakes beneath Mauna Loa's summit, upper Southwest Rift Zone, and west flank. During that same time period, HVO measured ground deformation consistent with input of magma into the volcano's shallow magma storage system.


This notice contains additional volcanoes not displayed: Hualalai (NORMAL/GREEN), Mauna Kea (NORMAL/GREEN), Haleakala (NORMAL/GREEN), Lo`ihi (UNASSIGNED/UNASSIGNED).

MORE INFORMATION

Activity summary also available by phone: (808) 967-8862

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 Hawaiʻi (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@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 Hawaiʻi.