Los Angeles February 9, 2024 3:26 pm Earthquakes: Foreshock, mainshock, aftershock. What's the difference? NBC4 Meteorologist David Biggar explains the differences between an earthquake foreshock, mainshock and aftershock on Friday, February 9, 2024. US & World Videos 0:50 Man dies in 10 Fwy shooting in Covina 2:33 Whittier man accused of stabbing 7-year-old brother 3:09 ‘He loved LA so much.” Lynette Romero remembers her friend Sam Rubin 2:36 Mandarin immersion program gaining popularity in Orange County 2:07 Sewage spill forces closures at several Los Angeles beaches