California was rattled by at least six earthquakes of magnitude 3.5 or greater on Tuesday, putting residents on edge and prompting them to wonder if "the big one" is coming soon.

The largest, measured at 4.5 magnitude by the U.S. Geological Survey, hit in the Ridgecrest area, where aftershocks were expected after two large earthquakes struck earlier this month. Four others were recorded in the same general area on Tuesday: one at 3.6 magnitude near Searles Valley, a 4.4-magnitude and a 3.5 near Coso Junction, and a 3.5 near Trona.

Another temblor measured at 4.3 magnitude struck in the eastern San Francisco Bay area

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There were no immediate reports of damage or injuries after any of Tuesday's quakes, but the one near San Francisco prompted more than 10,000 people to log a "felt report" with the USGS.

Some wondered if all the shaking meant a major earthquake was imminent, but the USGS said there was no cause for alarm.

"This specific sequence of earthquakes ... are not indicative that 'The Big One' is coming," Rafael Abreu, a geophysicist with the USGS National Earthquake Information Center in Colorado, told USA Today.

"We're having quakes exactly where, geographically speaking, we'd expect these quakes to happen. And we're having the amount of earthquakes we'd expect to see."

Lucy Jones, a seismologist and leading expert on California earthquakes, said on Twitter that a catastrophic quake is inevitable, but there's no indication of when exactly that will happen.

"I'm certain the probability of a big San Andreas event is 100% IF YOU GIVE ME ENOUGH TIME," Jones tweeted. "In other words, plate tectonics isn't stopping. But it's possible the big one is still 100 years away."