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2017-06-22. “Fingerprinting” Volcanic Tremors May Help Forecast Eruptions.

posted Jun 26, 2017, 9:34 PM by Alan Gould
By Lucas Joel, for Earth & Space Science News, EoS, AGU. For GSS Energy Flow chapter 2. Excerpt: Volcanic tremors can mean that an eruption is imminent—or maybe not. When it comes to linking tremors with impending eruptions, researchers are still very much in the dark. In a new study, however, one team of volcanologists revealed the existence of distinct tremor patterns, or tremor “fingerprints,” as they call them, shared among different kinds of volcanoes. Observations of such fingerprints may provide a small advance toward improved eruption forecasting. If, in the future, a volcano produces a fingerprint already found to have preceded or accompanied other eruptions, volcanologists might be better able to say whether an eruption will occur. The team behind the study discovered the fingerprints by looking at seismic signals produced by four volcanoes: Okmok, Redoubt, and Pavlof in Alaska and Kīlauea in Hawaii. Kīlauea and Okmok are shield volcanoes, which are generally broad, gently sloping volcanoes constructed by relatively fluid lava. Pavlof and Redoubt are stratovolcanoes, which are more conical volcanoes made from lava more viscous than that which creates shield volcanoes. Generally, higher viscosity of the molten rock yields more violent eruptions....  https://eos.org/wp-content/uploads/2017/05/June-17_magazine.pdf