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.
Ngauruhoe (pronouned "Nauruhó"), a steep 600 m tall stratovolcano 17 km NNE of Ruhapehu volcano, is the main vent of Tongariro volcano and one of New Zealand's most active volcanoes. Its last eruptive phase in 1975-77 produced violent ash explosions, lava fountains and pyroclastic flows. In its recent past, Ngauruhoe has been erupting around every 10 years and the time lapsed since then makes this the longest repose interval known in its recorded history.
Earthquakes (yellow and red circles) near Ngauruhoe during the past 14 days
New Zealand's GNS Science reports an increase in earthquakes under the volcano, interpreted as weak signs of volcanic unrest. The Volcanic Alert Level was raised to level 1 (minor volcanic unrest), but no eruption is expected in the near future. ...more
from the original report: "During the last two to three weeks there has been an increase in the number and magnitude of earthquakes being recorded by the GeoNet seismographs around Mount Ngauruhoe. Initial analysis indicates these earthquakes are shallow, occurring at depths of less than about 5 km. [less]
Igneous or magmatic rocks: The most primitive rock type forms when magma (molten rock) solidifies - either inside the earth (plutonic rocks) or during volcanic eruptions (volcanic rocks). A short overview.
Eyjafjallajökull volcano photos: The volcano in Iceland with the unpronounceable name... but famous in 2010 when its ash clouds drifted over Europe and forced a unprecedented large-scale airspace closure for several days, stranding millions of passengers.
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