(USGS revises location of second quake)

WASHINGTON, Oct. 26 (Reuters) - Two earthquakes shook northern California early on Sunday but local officials said there were no immediate reports of injuries or damages.

A magnitude 4.6 quake occurred about 19 miles (30 km) west of Petrolia, California, according to the U.S. Geological Survey. The town is about 265 miles (426 km) north of San Francisco. The quake hit at 2:26 a.m. PST (0926 GMT) and was 11 miles (17 km) deep, according to the USGS National Earthquake Center.

A second quake struck the same location about a minute later, the center said in a revised report. USGS originally reported that the second quake, measuring 4.1, hit near Fort Ross, California.

Magnitude 5 quakes are considered moderate and capable of causing considerable damage, while magnitude 4 quakes are considered light and capable of moderate damage.

Police in Humboldt and Sonoma counties said they had not received reports of damage or injuries. (Writing by Stacey Joyce; Editing by Howard Goller and Bill Trott)

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