Dover International Speedway OK after 4.1-magnitude earthquake

Dover International Speedway officials report the track and its staff are safe and sound after a 4.1-magnitude earthquake shook the Delaware facility around 4:47 p.m. ET Thursday afternoon. The epicenter was measured just 6 miles east-northeast of the 1-mile concrete track, according to the United States Geological Society. The magnitude falls under the category of "light" on the Richter scale, with noticeable shaking but zero to minimal damage. Early news about the temblor measured the severity higher, with initial reports of 4.4 and 5.1. Speedway officials said there were no initial reports of damage on the track's grounds, but that a more comprehensive survey was planned once daylight returned Friday. The track, known for its Miles the Monster mascot and its reputation as one of NASCAR's toughest venues, responded to the earthquake with trademark bravado in a tweet.