2 moderate quakes hit northern Mexico, days after magnitude-5.4 temblor

Eds: UPDATES with expert comment on aftershocks.

By LUIS PEREZ

Associated Press Writer

TIJUANA, Mexico (AP) -- Two moderate earthquake struck northwestern Mexico near the U.S. border on Monday and no major damage or injuries were reported.

A 5.0-magnitude earthquake took place at about 8:30 p.m. local time. About 10 hours earlier on Monday, a 5.1 temblor shook the area, prompting authorities to evacuate schools and resulting in at least one minor gas leak.

Both quakes were centered about 20 miles southeast of the border city of Mexicali, and 24 miles southeast of Calexico, Calif., according to the U.S. Geological Survey.

Monday's quakes were the latest in more than 40 aftershocks following Friday's magnitude-5.4 quake in the Mexicali area, USGS geophysicist Rafael Abreu said.

"This kind of situation might seem alarming on the ground, but it's very normal for this seismically active area," Abreu said.

In Mexicali, an industrial border city of about 750,000, the quake early Monday caused the wall of a school to fall and started a gas leak in a second school, prompting authorities to evacuate all of the city's schools, said Alfredo Escobedo, civil protection director for the Mexican state of Baja California, which includes Mexicali. Escobedo said no injuries or other damages were reported.

Friday's quake shut down factories and left 400,000 people without power. That quake was felt in parts of California and Arizona, the USGS said.

In 2000, the northern Baja California region near Mexicali was rattled by a cluster of quakes, but they did not cause any damage.

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U.S. Geological Survey: http://www.usgs.gov