Hawaiian Volcano Observatory

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Sulfur dioxide emission rates - Kīlauea summit - past year
December 31, 2019

Sulfur dioxide emission rates - Kīlauea summit - past year

Sulfur dioxide (SO2) emission rates measured using an upward-looking ultraviolet spectrometer. These data are collected by traversing the gas plume in a vehicle, downwind of Halema‘uma‘u, generally within and south of Kīlauea Caldera. Results from multiple traverses during a day are averaged to yield the emission rates shown here. Successful measurements depend

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Cross-caldera Distance Change - Past 5 Years Mauna Loa
December 31, 2019

Cross-caldera Distance Change - Past 5 Years

Cross-caldera Distance Change - Past 5 Years

Earthquake Depths - Past 5 Years Mauna Loa
December 31, 2019

Earthquake Depths - Past 5 Years Mauna Loa

Earthquake Depths - Past 5 Years 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.

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

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

Electronic Tilt at Kīlauea Summit and East Rift Zone - Past Week. 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 

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Earthquake Hypocenters Map - Past 5 Years - Kīlauea
December 31, 2019

Earthquake Hypocenters Map - Past 5 Years - Kīlauea

Map showing locations of earthquakes during the past 5 years.

Summit Vertical Motion - Past Year Mauna Loa
December 31, 2019

Summit Vertical Motion - Past Year

Summit Vertical Motion - Past Year

Cross-caldera Distance Change - Past 5 Years Mauna Loa
December 31, 2019

Cross-caldera Distance Change - Past 5 Years Mauna Loa

Cross-caldera Distance Change - Past 5 Years Mauna Loa. Changes in distance between two GPS stations on opposite sides of Moku'āweoweo, Mauna Loa's summit caldera. Extension across the caldera is often an indication of inflation of the shallow summit magma reservoir.

Earthquake Hypocenters Map - Past Month - Kilauea
December 31, 2019

Earthquake Hypocenters Map - Past Month - Kīlauea

Map showing locations of earthquakes during the past month.

Earthquake Hypocenters Cross Section - Past 5 Years - Kīlauea
December 31, 2019

Earthquake Hypocenters Cross Section - Past 5 Years - Kīlauea

 Depth of earthquakes (circles) during the past 5 years. Circle-size represents magnitude, and color indicates depth. 

Summit Vertical Motion - Past 5 Years Mauna Loa
December 31, 2019

Summit Vertical Motion - Past 5 Years

Summit Vertical Motion - Past 5 Years

Summit Vertical Motion - Past 5 Years Mauna Loa
December 31, 2019

Summit Vertical Motion - Past 5 Years Mauna Loa

Summit Vertical Motion - Past 5 Years Mauna Loa. Vertical motion of a GPS station on the southeast side of Mauna Loa's summit caldera. This station is in an area that has historically shown the largest amount of uplift with inflation. An offset in early 2014 is due to an equipment change at the station and is not related to deformation of the volcano.

Depth of Earthquakes - Past Month - Kīlauea
December 31, 2019

Depth of Earthquakes - Past Month - Kīlauea

Depth of earthquakes (circles) during the past month. Circle-size represents magnitude, and color indicates depth.