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originally posted by: DoctorBluechip
a reply to: MrRCflying
A harmonic tremor is a sustained release of seismic and infrasonic energy typically associated with the underground movement of magma, the venting of volcanic gases from magma, or both. It is a long-duration release of seismic energy, with distinct spectral lines, that often precedes or accompanies a volcanic eruption.
The Steamboat Geyser in Yellowstone National Park is approaching a record number of eruptions
Subduction zone volcanism occurs where two plates are converging on one another. One plate containing oceanic lithosphere descends beneath the adjacent plate, thus consuming the oceanic lithosphere into the earth's mantle. ... These trenches are the deepest topographic features on the earth's surface.