The Volcano Adventure Guide: Excellent information and background for anyone wishing to visit active volcanoes safely and enjoyably. The book presents guidelines to visiting 42 different volcanoes around the world.
Location of the past days' earthquakes on Sao Miguel island
An earthquake swarm has been going on since Monday (12 Feb 2018) in central Sao Miguel island. ...more
The Volcano Observatory (Observatório Vulcanológico e Sismológico da Univ. dos Açores, CIVISA) recorded dozens of mostly small quakes at shallow depths between 1-15 km in an area about 6-7 km west of Furnas volcano, half way between the caldera lakes of Lagunas Fogo and do Congro. The largest were 6 earthquakes of magnitudes 3.0-3.6, some of which were felt by local inhabitants. At the moment, the activity is still continuing, but has decreased significantly. It is unclear whether the earthquakes are volcanic in origin or not. If so, they could have been caused by a small magma intrusion at the lower crust and indicate an early sign of possible re-awakening of the volcanic system.
Distribution of quakes as depth vs time (the smaller quakes have no given depth from the dataset)
Introduction to Plate Tectonics: The Earth's upper, rigid layer is broken into several plates which are in constant motion to one another. Most earthquakes and volcanoes occur as result of these plate boundaries.
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