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Gravimeters, or "gravity meters", measure the strength of the Earth's gravitational field at any given point. This value may be affected by ground elevation, the density of the rock or material on which the gravimeter sits, and the presence of magma or fluids beneath the Earth's surface. USGS photo by J. Crozier.
Gravimeters, or "gravity meters", measure the strength of the Earth's gravitational field at any given point. This value may be affected by ground elevation, the density of the rock or material on which the gravimeter sits, and the presence of magma or fluids beneath the Earth's surface. USGS photo by J. Crozier.
A USGS scientist pulls a conductivity sensor out of a water well. These wells are usually drilled for other purposes (like livestock or agriculture) but are useful for scientists doing geodetic surveys. USGS photo by J. Crozier.
A USGS scientist pulls a conductivity sensor out of a water well. These wells are usually drilled for other purposes (like livestock or agriculture) but are useful for scientists doing geodetic surveys. USGS photo by J. Crozier.
Comparison of caldera-forming eruption sizes (by volume of erupted magma) in the U.S., modified from an AVO/USGS figure. Also included for reference is the 1980 eruption of Mount St. Helens. The three caldera-forming eruptions in Alaska are more than 200 times the size of the 1980 eruption of Mount St.
Comparison of caldera-forming eruption sizes (by volume of erupted magma) in the U.S., modified from an AVO/USGS figure. Also included for reference is the 1980 eruption of Mount St. Helens. The three caldera-forming eruptions in Alaska are more than 200 times the size of the 1980 eruption of Mount St.
The location of GPS station KRAC and its predecessor KRAK, slightly north of the center of deflation in Long Valley. USGS figure by Josh Crozier and Alicia Hotovec-Ellis.
The location of GPS station KRAC and its predecessor KRAK, slightly north of the center of deflation in Long Valley. USGS figure by Josh Crozier and Alicia Hotovec-Ellis.
Locations of earthquakes of at least magnitude 1.0 in 2025 and the outlines of the boxes CalVO uses to count earthquakes around Long Valley. Only 6 earthquakes were located inside the Long Valley Caldera box. (Earthquake location data from Northern California Seismic Network.) Figure by Alicia Hotovec-Ellis, USGS.
Locations of earthquakes of at least magnitude 1.0 in 2025 and the outlines of the boxes CalVO uses to count earthquakes around Long Valley. Only 6 earthquakes were located inside the Long Valley Caldera box. (Earthquake location data from Northern California Seismic Network.) Figure by Alicia Hotovec-Ellis, USGS.
Graphs of the number of earthquakes located each year since 1980 in the Long Valley Caldera and nearby Sierra Block monitoring boxes. Note that the number of earthquakes on the left shown on a logarithmic scale, which means they increase an order of magnitude with each "step." Figure by Alicia Hotovec-Ellis, USGS.
Graphs of the number of earthquakes located each year since 1980 in the Long Valley Caldera and nearby Sierra Block monitoring boxes. Note that the number of earthquakes on the left shown on a logarithmic scale, which means they increase an order of magnitude with each "step." Figure by Alicia Hotovec-Ellis, USGS.