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For more information on how electronic tiltmeters and GPS receivers help monitor the deformation of Kīlauea Volcano, see the HVO Deformation page.
Click image at right for larger map. Data plots from additional stations are available from our interactive map. Use the right-side menu to view different types of data.
Electronic Tilt at Kīlauea Summit - Past 2 Days
Electronic Tilt at Kīlauea Summit and East Rift Zone - Past Week
Electronic Tilt at Kīlauea Summit and East Rift Zone - Past Month
Above: The blue line shows the radial tilt at Uwekahuna Station (UWE), on the western rim of Kīlauea's caldera. The green line is a 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 heavy rainfall or, occasionally, instrumental malfunctions.
Past Five Years
Above SUMMIT GPS: Change in distance between two Global Positioning System (GPS) stations located on opposite sides of Kīlauea's caldera. A rapid increase in distance can be interpreted as inflation of the summit magma reservoir or Pu‘u ‘Ō‘ō magma storage chamber. Above Pu‘u ‘Ō‘ō GPS: Change in distance between two station near Pu‘u ‘Ō‘ō. A rapid increase in distance can be interpreted as inflation of the summit magma reservoir Pu‘u ‘Ō‘ō magma storage chamber.
PUOC - Past 6 months
GPS station PUOC weathered the 2018 eruption, but recent data suggests it is slowly sliding into Pu'u 'O'o crater. You can see its southward progress, into the crater in the above plot. This motion is not directly related to magmatic activity at Pu'u 'O'o, but is interpreted to be sliding off the unstable edge of Pu'u 'O'o cone. This GPS station is very close to the edge of the crater, so it is not hugely surprising to see this happening after the big changes at Pu'u 'O'o in the summer of 2018.