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Past 5 Years Monitoring Data for Mauna Loa

Seismic Data

Earthquake Hypocenters Map and Cross Section - Past 5 Years

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Remote image Url

Above Top: Map showing locations of earthquakes during the past year. Bottom: Depth of earthquakes (circles) during the past five years. Depth is reported relative to sea level, which is equal to a depth of zero on the above plot. Circle-size represents magnitude, and color indicates depth. An interactive earthquakeplot can be found on the HVO Earthquakes page

Earthquake Rates and Depths - Past 5 Years

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Remote image Url

Above Top: Number of earthquakes per month during the past five years (blue bars). The red line is the cumulative moment (energy) release. Bottom: Depth of earthquakes during the past week in the area shown on the map above. Depth is reported relative to sea level, which is equal to a depth of zero on the above plot. On both figures, circle-size represents magnitude, and color indicates depth. An interactive earthquake plot can be found on the HVO Earthquakes page.

Deformation Data

Global Positioning System - Past 5 Years

Cross-caldera Distance Change

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Above: Changes in distance between two GPS stations on opposite sides of MOKUAWEOAWEO, Mauna Loa's summit caldera. Extension across the caldera is often an indication of inflation of the shallow summit magma reservoir.

Summit Vertical Motion

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Above: 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.

Select deformation instruments on Mauna Loa volcano....
Select deformation instruments on Mauna Loa volcano.

Map of Selected Deformation Stations

For more information on how electronic tiltmeters and GPS receivers help monitor the deformation of Mauna Loa Volcano, see the HVO Deformation page