Hekla volcano in Iceland is showning signs of unrest. Signs of possible  magma movement under the volcano has been detected for the past few  days. Since 1970, Hekla volcano has erupted about every 10 years. The  initial phase of each Hekla eruption is always highly explosive. The  duration and magnitude of the explosive phase is directly correlated with the length of the preceding  repose period. Hekla is the most active volcano in Iceland, and one of  the world's best known volcanoes.
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