4.3-magnitude earthquake shakes Mexico and wakes up hundreds in Southern California

Hundreds of people in Southern California were shaken awake after an earthquake in Mexico, geologists said.

A 4.3-magnitude earthquake shook near El Sauzal in Mexico at about 4:20 a.m. Monday, July 25, according to the U.S. Geological Survey. The earthquake could be felt in Southern California, including about 130 miles north in San Diego.

The National Weather Service said there is no tsunami expected from the earthquake.

More than 500 people reported feeling the earthquake to the USGS. Many people said on social media they were woken up by the earthquake.

Magnitude measures the energy released at the source of the earthquake, the U.S. Geological Survey says. It replaces the old Richter scale.

Quakes between 2.5 and 5.4 magnitude are often felt but rarely cause much damage, according to Michigan Tech. Quakes below 2.5 magnitude are seldom felt by most people.