harmonic tremor
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Harmonic tremor — describes a continuous rhythmic earthquake in the Earth s upper lithosphere that can be detected by a seismograph and often precedes or accompanies volcanic eruptions.A harmonic tremor is a continuous release of seismic energy typically… … Wikipedia
harmonic tremor — ALASKA VOLCANO OBSERVATORY GLOSSARY A continuous release of seismic energy typically associated with the underground movement of magma. It contrasts distinctly with the sudden release and rapid decrease of seismic energy associated with the more… … Glossary of volcanic terms
Harmonic (disambiguation) — Harmonic usually refers to components of sound. For applications of the concept to the Electrical power industry and power systems, see Harmonics (electrical power).Harmonic can also refer to: * harmonic (mathematics), a number of concepts in… … Wikipedia
tremor — ALASKA VOLCANO OBSERVATORY GLOSSARY Low amplitude, continuous earthquake activity often associated with magma movement. GLOSSARY OF VOLCANIC TERMS A continuous vibration of the ground around active volcanoes (Vergniolle and Mangan, 2000, p. 447) … Glossary of volcanic terms
volcanic tremor — ALASKA VOLCANO OBSERVATORY GLOSSARY Continuous seismic signal with regular or irregular sine wave appearance and low frequencies (0.5 5 Hz). Harmonic tremor has a very uniform appearance, whereas spasmodic tremor is pulsating and consists of… … Glossary of volcanic terms
Prediction of volcanic activity — (also: volcanic eruption forecasting ) is an interdisciplinary scientific and engineering approach to natural catastrophic event forecasting. Volcanic activity prediction has not been perfected, but significant progress has been made in recent… … Wikipedia
2004 and later volcanic activity of Mount St. Helens — The 2004 and later volcanic activity of Mount St. Helens has been documented as a continuous eruption with a gradual extrusion of magma at the Mount St. Helens volcano in Washington, United States. Starting in October 2004 and ceasing in January… … Wikipedia
Grímsvötn — Vue aérienne du Grímsfjall, le sommet du Grímsvötn, dominant la caldeira sur la droite en 1972. Géographie Altitude 1 725 m, Grímsfjall … Wikipédia en Français
Mauna Loa — For other uses, see Mauna Loa (disambiguation). Mauna Loa … Wikipedia
Nazko Cone — Nazko Cone, the easternmost and youngest volcano overlying the Anahim hotspot Elevation … Wikipedia
