Mysterious Quakes on Danish Island Caused by Acoustic Pressure Waves

Scientists are baffled by a series of unexplained quakes that shook the Danish Baltic island of Bornholm. The tremors were felt by dozens of people and caused some minor structural damage to buildings.

The tremors occurred mainly between 3 and 4 p.m. local time. Witnesses described them as deep rumbling, shaking, or rattling. Some people said that their windows rattled and that they felt a change in air pressure.

The Geological Survey of Denmark and Greenland (GEUS) initially suspected that the quakes were caused by an earthquake. However, further investigation ruled out this possibility. The GEUS now believes that the tremors were caused by acoustic pressure waves from an event in the atmosphere.

Acoustic pressure waves are sound waves that travel through the air. They can be caused by a variety of things, such as explosions, sonic booms, and even large thunderstorms. When these waves reach the ground, they can cause the ground to vibrate, which can be felt as a tremor.

The GEUS is still investigating the source of the acoustic pressure waves that caused the tremors on Bornholm. However, they believe that it is unlikely that they were caused by a controlled explosion in Poland that occurred shortly before the first reports of tremors.