Scientists Puzzled By Mystery Tremors Off Danish Island

Series of mysterious tremors in Denmark puzzle scientists

A series of minor tremors recorded on the Danish Baltic island of Bornholm Saturday has puzzled scientists, who now say they were caused by "acoustic pressure waves from an unknown source." At first the tremors were thought to have been caused by earthquakes. Then, seismologists theorized that they originated from controlled explosions in Poland, more than nearly 90 miles to the south. On Monday, the Geological Survey of Denmark and Greenland, a…

Scientists Puzzled By Mystery Tremors Off Danish Island

At first the tremors were thought to have been caused by earthquakes, but on Monday researchers said they were caused by pressure waves from "an unknown source."