2 Small Temblors Go Nearly Unnoticed : Earthquakes: Both are centered in ocean off Huntington Beach. One measures 3.3, the other 3.1.

Two small earthquakes struck off the coast of Huntington Beach on Wednesday morning but went virtually unnoticed by county residents, local fire officials said.

The first quake struck at 4:38 a.m. and measured 3.3 on the Richter scale. The second hit at 10:47 a.m. with a magnitude of 3.1.

The temblors were centered in the ocean about 12 miles south of Huntington Beach, said Waverly Person, a seismologist with the U.S. Geological Survey’s National Earthquake Information Center in Colorado. He described them as minor and unrelated to the two major earthquakes that rocked Southern California on June 28.

Person said that small offshore quakes occur quite frequently and are rarely noticed by anyone other than seismologists, but the June 28 temblors have made people much more interested in reports of milder quakes.

“A lot of these small earthquakes happen in the waters off of California,” he said. “People are a lot more observant of earthquakes right now.”

Local fire and police departments throughout Orange County said they did not receive any calls in relation to the earthquakes.

“It was quiet here all morning,” said Emily Day, a spokeswoman for the Orange County Fire Department.

Although the epicenter of the earthquakes was 12 miles east of Santa Catalina Island, hotel managers and other residents there said few people seemed to notice the quakes.

“Nobody felt a thing,” said Dawn Shawhan of the Catalina Chamber of Commerce and Visitors Bureau.

“We have an older hotel and usually we would feel the windows rattle,” said Bob Roy, manager of the El Rancho Hotel. “We felt the ones a couple of weeks ago but no guests or employees mentioned anything about these.”

Offshore Quakes Magnitude 3.3 at 4:38 a.m. Magnitude 3.1 at 10:47 a.m.