Several people in the Chicago region have report hearing loud roar in the last couple of days , and give the sudden and extreme drop in temperature due to the diametrical whirl , people have come out suggesting that the grounds of the noise and tremors might be “ hoarfrost quakes ” .

Frost quakes , also known as cryoseisms or ice quakes , only fall out when several conditions are meet . This make them both difficult to predict and difficult to confirm once they have happened . According to a late study , for a hoar quake to occur you needfour thing . The region postulate to be susceptible to sudden drop in temperature . The ground need to be soaked in H2O and   also have very little Charles Percy Snow screening . And most significantly , you need the temperature to quickly dribble from near freezing to tens of degrees below zero .

What materialize next is quite straightforward . The water in the ground freeze and as it does so , it expands and puts pressure on the soil . The ground comes under a considerable   amount of stress   which is take over explosively . This can cause tremors and a loud boom . The effect   are usually extremely localised and they might not register on seismographs if they ’re not close enough .

The noise in and around Chicago was report by local news stationWGN television , with   various   Twitter user reassert that they have heard the bonanza   too . Still , Robert Frost seism might not have been the movement of the sound and it could be difficult to confirm whether they were .

The term " frost quake " might not be a household name but the phenomenon has been document in the   northeastern part of the American continent for at least two centuries . And over the last few years , they have beenreported in the newsmore and more ofttimes . This could be because people can more well enquire online and demand “ hey , what was that loud bang ? ” , but it could also intend that these events are becoming more common . research worker distrust that climate change might have made the term that lead to cryoseismsmore probably .

While there should n’t be any more frost quakes in the Midwest , the frosty temperature will keep for another few 24-hour interval and people in the area are advised not to stay outside for long .

[ H / T : hold up Science ]