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Illustrated Volcano Glossary
Tephrite is an type of volcanic (extrusive) rock with low silica content, similar to basalt, but containing foid minerals (e.g. nephelinite, leucite) along with plagioclase.
The composition of tephrite is called tephritic.
Tephritic refers to the mineral composition of tephrite, an type of volcanic (extrusive) rock with low silica content, similar to basalt, but containing foid minerals (e.g. nephelinite, leucite) along with plagioclase.
Seismogram signal examples from volcanic earthquakes: Volcano Tectonic (VT) Low Frequency (LF), hybrid (mix of VT and LF), Very Low Frequency (VLF), and Tremor. Volcano name/date in lower left. (image: USGS)
Tumulus with strange shapes, on the lava flow field of the 1614-24 eruption of Mt. Etna, Italy.
From Latin "tumulus" = "little hill", tumuli (pl.) are uplifted sections of pahoehoe lava crust caused by pressure from still fluid lava accumulating beneath the hardened crust.
Tumuli are a characteristic feature of all pahoehoe lava flow fields, such as prominent on Kilauea volcano, Hawaii, but also many other basaltic volcanoes including Etna. -> See whole entry
More on VolcanoDiscovery:
Volcano Calendar 2019
: We're proud to present our 2019 volcano calendar: 13 different and attractive images of volcanoes, volcanic landscapes and phenomena taken during volcano tours over the past few years.
Volcanoes of Peru
: Our 12-days itinerary includes some of the most beautiful and interesting sights around Arequipa from "volcanic point of view": La Laguna de Salinas, El Misti, Ubinas, Picchu Picchu, Andagua Valley, Colca Canyon, and currently erupting Sabancaya volcano.
Photos from Vanuatu
: A fascinating archipelago with very active volcanoes, tropical islands and very friendly and hospital people who still live their original Melanesian culture. Browse through our vast collection of photos.