UPDATE – Residents of the San Francisco Bay Area were a bit startled when they felt the ground beneath them shaking from at least five earthquakes on Sunday, officials said. Scientists said a 4.0-magnitude earthquake struck near Concord, a suburb located about 30 miles northeast of downtown San Francisco, at about 2:15 p.m. local time Sunday.

The U.S. Geological Survey said the movement, though, could be felt by much of the Bay Area — though experts described the sensation as a quick jolt. About 10 minutes earlier, a 2.5-magnitude tremor struck that same area — which was followed by quakes measured at magnitudes of 2.7, 2.4 and 1.6 within the next 45 minutes. The seismic events shook buildings and homes, mostly in the East Bay region — which lies west of the Oakland-San Francisco Bay Bridge — but no injuries or damage were initially reported. The USGS measured the earthquakes about nine miles underground. Thousands of Bay Area residents reported feeling the series of tremors to the USGS’s reporting website and wrote of the shaking on social media channels. MORE