California had two more earthquakes - with no injuries or damage - on the heels of Tuesday’s off-shore quake and brief tsunami warning.

A strong undersea quake - once again offshore of northern California - hit on Thursday night, according to the U.S. Geological Survey. The magnitude 6.6 earthquake occurred at 10:21 p.m., and no tsunami warning was issued. It was about 6.2 miles beneath the ocean floor and some 125 miles from Eureka - with an epicenter very close to the Tuesday quake.

This latest temblor came about nine hours after a widely-felt, 4.9-magnitude quake hit east of Los Angeles. Aftershock reports indicate there is a 10% chance of a strong aftershock within the next 7 days, and there is a small chance of an aftershock larger than the main quake. Three to 15 aftershocks are expected in the next 7 days.

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