(SESSER/MT. VERNON) For those wondering what the sudden jolt and loud boom was this past Saturday afternoon at around 3:00 was, here’s some information we’ve gathered in response to it. First of all, the U.S. Geological Survey and its earthquake data shows that there were no official earthquakes or tremors that occurred in the Midwest on Saturday. In fact, the last Midwestern earthquake was 14 days ago, on November 5, a 2.2 magnitude quake in the far northwestern tip of Tennessee, near the community of Tiptonville. The last downstate Illinois earthquake was a month ago on October 15, a 2.1 magnitude quake over six miles northwest of Sparta. One explanation for the Saturday event is a controlled demolition explosion that was conducted by mining officials down in Jefferson County. The Franklin County EMA assisted in the explosion of a silo at the Rend Lake Mine near Sesser. The planned explosion was a success with no incidents or problems reported, simply a loud boom and shake of the ground, according to officials.