Hawaiian Volcano Observatory

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Electronic Tilt at Kīlauea Summit and East Rift Zone - Past Month
December 31, 2019

Electronic Tilt at Kīlauea Summit and East Rift Zone - Past Month

The blue line shows the radial tilt at Uwekahuna station (UWE), on the western rim of Kīlauea's caldera. The green line is radial tilt at Pu‘u ‘Ō‘ō (POO), north of Pu‘u ‘Ō‘ō cone. These are recorded by continuously operating electronic tiltmeters. Positive changes often indicate inflation of the magma storage areas beneath the caldera or Pu‘u ‘Ō‘ō, but may also result from

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Earthquake Depths - Past 5 Years - Kīlauea
December 31, 2019

Earthquake Depths - Past 5 Years - Kīlauea

Depth of earthquakes during the past 5 years in the area shown on the map above. Circle-size represents magnitude, and color indicates depth.

Earthquake Depths - Past Week Mauna Loa
December 31, 2019

Earthquake Depths - Past Week Mauna Loa

Earthquake Depths - Past Week Mauna Loa. Depth of earthquakes during the past week in the area shown on the map above. On both figures, circle-size represents magnitude, and color indicates depth. An interactive earthquake plot can be found on the HVO Earthquakes page.

Sulfur dioxide concentration in ambient air - Kīlauea Summit - Past Month
December 31, 2019

Sulfur dioxide concentration - Kīlauea Summit - Past Month

Sulfur dioxide concentration in ambient air - Kīlauea Summit - Past Month. HRCPK raw data SO2.

Electronic Tilt at Mauna Loa Summit - Past Week
December 31, 2019

Electronic Tilt at Mauna Loa Summit - Past Week

Electronic Tilt at Mauna Loa Summit - Past Week. Tilt data from a site near the northwest rim of Mauna Loa's summit caldera. The tiltmeter responds to daily and seasonal temperature fluctuations as well as possible changes in Mauna Loa's magma storage system.

Sulfur dioxide concentration - Kīlauea Summit - Past Month
December 31, 2019

Sulfur dioxide concentration - Kīlauea Summit - Past Month

Sulfur dioxide concentration in ambient air - Kīlauea Summit - Past Month. HRSDH raw data SO2.

Earthquake Hypocenters Map - Past Month Mauna Loa
December 31, 2019

Earthquake Hypocenters Map - Past Month Mauna Loa

Earthquake Hypocenters Map - Past Month Mauna Loa.  Map showing locations of earthquakes during the past month. 

Sulfur dioxide concentration - Kīlauea Summit - Past Month
December 31, 2019

Sulfur dioxide concentration - Kīlauea Summit - Past Month

Sulfur dioxide concentration in ambient air - Kīlauea Summit - Past Month. HRPKE raw data SO2.

Earthquake Hypocenters Cross Section - Past Month Mauna Loa
December 31, 2019

Earthquake Hypocenters Cross Section - Past Month Mauna Loa

Earthquake Hypocenters Cross Section - Past Month Mauna Loa. Depth of earthquakes (circles) during the past month. Circle-size represents magnitude, and color indicates depth.

Color map of the Big Island showing earthquake locations
December 31, 2019

Island of Hawai‘i earthquakes since August 2019

About 1300 earthquakes with magnitudes greater than 1 and at depths over 20 km (12 mi) on and around the Island of Hawai‘i since August 2019 are depicted on this map. Most of the earthquakes were clustered beneath the southern edge of the island near the town of Pāhala. Blue and purple dots indicate earthquakes at 20-40 km (12-25 mi) and more than 40 km (25 mi) depths

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Earthquake Hypocenters Map - Past Year - Kīlauea
December 31, 2019

Earthquake Hypocenters Map - Past Year - Kīlauea

Map showing locations of earthquakes during the past year. 

Earthquake Rates - Past Month Mauna Loa
December 31, 2019

Earthquake Rates - Past Month Mauna Loa

Earthquake Rates - Past Month Mauna Loa. Number of earthquakes per day during the past month (blue bars). The red line is the cumulative moment (energy) release.