Hawaiian Volcano Observatory

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

Cross-caldera Distance Change - Past Year

Cross-caldera Distance Change - Past Year

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

Earthquake Rates - Past 5 Years Mauna Loa

Earthquake Rates - Past 5 Years Mauna Loa. Number of earthquakes per month during the past five years (blue bars). The red line is the cumulative moment (energy) release.

Earthquake Depths - Past Week Kilauea
December 31, 2019

Earthquake Depths - Past Week Kilauea

Earthquake Depths - Past Week Kilauea. Depth of earthquakes (circles) during the past week. Circle-size represents magnitude, and color indicates depth.

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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Plot of water depth in the lake at Kilauea Volcano's summit
December 31, 2019

Water depth plot for Kilauea Volcano summit water lake

Water formed a tiny pond at the bottom of Halema‘uma‘u crater, at the summit of Kīlauea Volcano, in late July 2019. The pond has slowly deepened since then. HVO scientists measure water level almost daily using a small laser rangefinder mounted on a tripod. The measurements are made dependent on weather, wind, and staff availability. The rangefinder calculates the vertical

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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.