Use caution when traveling through early Friday. Anything that was wet or slushy earlier today is likely solid and icy at this point. What is of more concern with the flash freeze is the potential ice on roadways. Frost quakes are not commonly reported with damage or injuries. These types of cryoseisms are rare and poorly understood. Because it has nowhere else to go, it cracks the soil or rock causing a loud noise and the shaking of the ground. While the sounds can be eerie and cause alarm, there isn't really a huge concern. Frost quakes, or cryoseisms, occur when there is a rapid drop in temperature. The rapid change in temperature can also cause cracking and popping sounds in buildings. The materials making up your home also expand and contrast with temperature and environmental changes. You may also be hearing these strange sounds in your home in which a similar situation is occurring. Numerous ice quakes share similar spectrograms with Bloop, as well as the amplitude necessary to detect them despite ranges exceeding 5,000 km (3,000 mi). When this occurs, the sudden freeze will cause underground ice to expand, causing soil and rock to crack, which will produce these booms, and in more extreme cases, shakes. The NOAA Vents Program has attributed the sound to that of a large cryoseism (also known as an ice quake). A frost quake is a natural phenomenon that occurs when extremely cold temperatures lead to sudden deep freezing of the ground, after it has been saturated with water. This is likely the result of frost quakes. Reports of loud pops and booms have been reported across southern Wisconsin Thursday night.
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