More craters are being located in remote areas of Siberia, and some of them are massive. Russian scientists have now discovered seven of these craters, and believe that there are many more in the region. More worrying, like the unidentifiable explosive sounds and tremors that are being reported in the United States, their cause is unknown. The two phenomena may or may not be related. In the case of the Siberian craters, suspicion is falling on underground methane concentrations, which are being freed from frozen tundra, concentrating in pockets which are compressed by the weight of the soil above them until there is an explosive reaction. The sounds in the United States are not under any publicly known study, and there isn't even any scientific speculation about their origin.
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