HAWAIIAN VOLCANO OBSERVATORY MONTHLY UPDATE U.S. Geological Survey Friday, August 2, 2019, 2:02 PM HST (Saturday, August 3, 2019, 00:02 UTC)

HUALALAI VOLCANO (VNUM #332040) 19°41'31" N 155°52'12" W, Summit Elevation 8278 ft (2523 m) Current Volcano Alert Level: NORMAL Current Aviation Color Code: GREEN

No significant activity was recorded at Hualālai Volcano over the past month. Nine earthquakes were recorded in the vicinity of the volcano. Seismic activity is back to background level following the April 13th M5.3 earthquake. HVO's continuously recording Global Positioning System (GPS) receiver atop Hualālai recorded no significant deformation over the past month.

Background: Hualālai is the third most active volcano on the Island of Hawaiʻi and typically erupts 2 to 3 times per 1,000 years. Hualālai last erupted in 1801 and, more recently, had a damaging seismic swarm in 1929 that was probably the result of a shallow intrusion of magma. Hualālai Volcano is monitored by one continuous GPS instrument and a seismometer located southeast of the summit as well as several instruments on nearby flanks of Mauna Loa and Mauna Kea. Key sites on Hualālai and western Mauna Loa are resurveyed using GPS receivers every few years to detect any changes in the volcano's shape.

MAUNA KEA VOLCANO (VNUM #332030) 19°49'12" N 155°28'12" W, Summit Elevation 13796 ft (4205 m) Current Volcano Alert Level: NORMAL Current Aviation Color Code: GREEN

No significant activity was detected at Mauna Kea Volcano over the past month. 15 earthquakes were detected in the vicinity of the volcano. A single, continuously recording Global Positioning System (GPS) receiver atop Mauna Kea (operated by NASA’s Jet Propulsion Laboratory) recorded no significant changes in deformation during this time.

Background: Mauna Kea was last active about 4,600 years ago. Monitoring is conducted using three seismometers and one GPS receiver on the volcano plus instruments on adjacent Kohala volcano and denser seismic and geodetic networks on the north flank of Mauna Loa to the south.

HALEAKALA VOLCANO (VNUM #332060) 20°42'29" N 156°15' W, Summit Elevation 10023 ft (3055 m) Current Volcano Alert Level: NORMAL Current Aviation Color Code: GREEN

No significant activity was recorded at Haleakalā Volcano over the past month. No earthquakes were recorded in the vicinity of the volcano. The continuously recording Global Positioning System (GPS) instrument atop Haleakalā recorded no significant deformation during this time.

Background: The most recent eruption on Haleakalā was probably between A.D. 1480 and 1600. Haleakalā Volcano is monitored by a continuous GPS instrument and a seismometer located near the southwest edge of the summit crater. Key sites on Haleakalā are resurveyed using GPS receivers every few years to detect any changes in the volcano's shape.

LOIHI SEAMOUNT VOLCANO (VNUM #332000) 18°55'12" N 155°16'12" W, Summit Elevation -3199 ft (-975 m) Current Volcano Alert Level: UNASSIGNED Current Aviation Color Code: UNASSIGNED

Lō‘ihi's seismic activity remained very low over the past month. Five earthquakes were detected in the vicinity of the volcano.

Background: Intermittent earthquake activity has been recorded in the vicinity of Lō‘ihi since as early as 1952. The most energetic earthquake sequence occurred in July-August 1996, which included more than 4,000 earthquakes, 95 of which were magnitude-4.0 to 4.9 events and nearly 300 were larger than magnitude 3 events. There are no working monitoring instruments on Lō‘ihi Volcano whose peak is about 1,000 m (3,280 ft) below sea level. All real-time information about the volcano is derived from land-based seismometers on the Island of Hawai‘i.

MORE INFORMATION

Activity summary also available by phone: (808) 967-8877

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

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/vhp/about_alerts.html

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.

ALERT LEVEL: NORMAL Volcano is in typical background, noneruptive state or, after a change from a higher level, volcanic activity has ceased and volcano has returned to noneruptive background state.

AVIATION COLOR CODE: GREEN Volcano is in typical background, non-eruptive state or, after a change from a higher level, volcanic activity has ceased and volcano has returned to noneruptive background state.

HAWAIIAN VOLCANO OBSERVATORY MONTHLY UPDATE U.S. Geological Survey Friday, June 7, 2019, 1:12 PM HST (Friday, June 7, 2019, 23:12 UTC)

HUALALAI VOLCANO (VNUM #332040) 19°41'31" N 155°52'12" W, Summit Elevation 8278 ft (2523 m) Current Volcano Alert Level: NORMAL Current Aviation Color Code: GREEN

No significant activity was recorded at Hualālai Volcano over the past month. Four earthquakes were recorded in the vicinity of the volcano. Seismic activity is back to background level following the April 13th M5.3 earthquake. HVO's continuously recording Global Positioning System (GPS) receiver atop Hualālai recorded no significant deformation over the past month.

Background: Hualālai is the third most active volcano on the Island of Hawaiʻi and typically erupts 2 to 3 times per 1,000 years. Hualālai last erupted in 1801 and, more recently, had a damaging seismic swarm in 1929 that was probably the result of a shallow intrusion of magma. Hualālai Volcano is monitored by one continuous GPS instrument and a seismometer located southeast of the summit as well as several instruments on nearby flanks of Mauna Loa and Mauna Kea. Key sites on Hualālai and western Mauna Loa are resurveyed using GPS receivers every few years to detect any changes in the volcano's shape.

MAUNA KEA VOLCANO (VNUM #332030) 19°49'12" N 155°28'12" W, Summit Elevation 13796 ft (4205 m) Current Volcano Alert Level: NORMAL Current Aviation Color Code: GREEN

No significant activity was detected at Mauna Kea Volcano over the past month. A dozen earthquakes were detected in the vicinity of the volcano. A single, continuously recording Global Positioning System (GPS) receiver atop Mauna Kea (operated by NASA’s Jet Propulsion Laboratory) recorded no significant changes in deformation during this time. HVO's GPS station MKPM (Mauna Kea Permanent) is back online.

Background: Mauna Kea was last active about 4,600 years ago. Monitoring is conducted using three seismometers and one GPS receiver on the volcano plus instruments on adjacent Kohala volcano and denser seismic and geodetic networks on the north flank of Mauna Loa to the south.

HALEAKALA VOLCANO (VNUM #332060) 20°42'29" N 156°15' W, Summit Elevation 10023 ft (3055 m) Current Volcano Alert Level: NORMAL Current Aviation Color Code: GREEN

No significant activity was recorded at Haleakalā Volcano over the past month. No earthquakes were recorded in the vicinity of the volcano. The continuously recording Global Positioning System (GPS) instrument atop Haleakalā recorded no significant deformation during this time.

Background: The most recent eruption on Haleakalā was probably between A.D. 1480 and 1600. Haleakalā Volcano is monitored by a continuous GPS instrument and a seismometer located near the southwest edge of the summit crater. Key sites on Haleakalā are resurveyed using GPS receivers every few years to detect any changes in the volcano's shape.

LO`IHI VOLCANO (VNUM #332000) 18°55'12" N 155°16'12" W, Summit Elevation -3199 ft (-975 m) Current Volcano Alert Level: UNASSIGNED Current Aviation Color Code: UNASSIGNED

Lō‘ihi's seismic activity remained very low over the past month. Four earthquakes were detected in the vicinity of the volcano.

Background: Intermittent earthquake activity has been recorded in the vicinity of Lō‘ihi since as early as 1952. The most energetic earthquake sequence occurred in July-August 1996, which included more than 4,000 earthquakes, 95 of which were magnitude-4.0 to 4.9 events and nearly 300 were larger than magnitude 3 events. There are no working monitoring instruments on Lō‘ihi Volcano whose peak is about 1,000 m (3,280 ft) below sea level. All real-time information about the volcano is derived from land-based seismometers on the Island of Hawai‘i.

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.