Residents across the San Francisco Bay Area were jolted awake early Monday by a moderate earthquake that was felt widely across the region.

An earthquake with a magnitude of 4.3 rocked the San Francisco Bay Area early Monday, waking up many people, with more 24,000 saying they felt it, according to the United States Geological Survey.

"Trains are running at reduced speeds while we complete safety track inspections. Please expect residual delays of up to 20 minutes systemwide."