California has been rocked by an earthquake measure 5.8 magnitudes, with a 5.0 shock following just minutes later in a day of seismic activity along the Ring of Fire which has put Californians on alert for the Big One. The most recent quake happened at 5.24pm GMT, or 9.24am local time, in the so-classed “ring of fire”. Initially USGS reported two earthquakes in the space of 15 seconds at 5.24pm, however, this was later amended to reflect just one quake, with a magnitude of 5.0. The previous quake happened just an hour previously, at 4.39pm (8.39am local time), with a higher magnitude of 5.8. It follows the 4.1 magnitude earthquake which rocked California this morning and was felt in both San Diego and Los Angeles. The tremors affected up to 10 million people across the state, according to USGS. This morning’s earthquake hit at 2.09am PST (10.09am GMT) with its epicenter 5km north east of Trabuco Canyon in California. Tremors were felt in San Diego and the Los Angeles area, with people shaken awake by the violent tremors, with one person saying there was huge “jolt”.