Iceland has experienced two significant earthquakes in the past four days. The second quake, which occurred shortly after midnight on Wednesday, was felt throughout the island and measured 6.6 on the Richter scale. Iceland, which is volcanically active, experiences many small quakes. However, before last Saturday. it had not experienced a quake as intense as 6.6 since 1910. There is no known precedent for two such quakes a few days apart. The second quake originated at a depth of 6.6 miles, characterized by scientists as unusually shallow.

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