Tag Archives: Tephra

The crater’s many moods. Hverfjall is a massive tephra ring crater formed during a volcanic eruption around 2800 years ago. It is part of the Krafla Volcanic System near Mývatn in north Iceland. The crater is 1.3 Kms in diameter and 140 metres deep. As these images suggest, the Icelandic landscape is given to rapid […]

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