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Las Pilas (El Hoyo) Volcanic Complex, Nicaragua

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Homa Mountain is a 1,751 m carbonatitic volcanic complex on the E shore of Lake Victoria in Kenya.  It is a relatively old volcanic system, active possibly over the last 13 Ma, with the most recent eruption likely a maar formation described in oral tradition by local natives.  The mountain forms a peninsula on the […]

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Newberry volcano is located E of the Cascades.  It is a massive shield-shaped composite volcano, 2,434 m at its highest point, covering over 1,600 km2.  The primary shield was constructed by basalts and basaltic andesites.  It has over 400 cinder cones on it.  The volcano produced major silicic eruptions forming a 6 x 8 km […]

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Umboi Island is the largest volcanic island between the mainland of Papua New Guinea and New Britain.  The island is separated from New Britain by the Dampier Strait, from New Guinea by the Vitiaz Strait.  The basaltic andesitic cone tops out at 1,335 m.  The island has a 13 x 15 km caldera.  Post-caldera activity […]

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The 1,670 m conical Volcan Arenal (Sand Volcano) is the youngest stratovolcano in Costa Rica.  It is one of the most active volcanoes in Costa Rica, erupting mostly andesites, though there are basaltic andesite, basalts and some dacite.  The earliest known eruptions from it took place 7.0 ka.  It was concurrently active with neighboring Volcan […]

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Mount Chokai (Chokaisan) is a 2,236 m active volcano located in the Tohoku region on Honshu, the largest main island of Japan.  It is constructed of a pair of overlapping stratovolcanoes, both of which have breached calderas, horseshoe craters and debris avalanche flows below the calderas.  Post caldera activity in both calderas built domes. The […]

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