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| 5.2 earthquake strikes California near San Diego | 5.2 earthquake strikes California near San Diego |
| (about 2 hours later) | |
| Watch: Dogs spooked as earthquake shakes homes near San Diego | Watch: Dogs spooked as earthquake shakes homes near San Diego |
| A 5.2 earthquake rattled San Diego, California, and the surrounding area on Monday afternoon, according to the US Geological Survey. | A 5.2 earthquake rattled San Diego, California, and the surrounding area on Monday afternoon, according to the US Geological Survey. |
| The quake struck at 10:08 local time (18:00 GMT) with an epicentre in Julian, California. | The quake struck at 10:08 local time (18:00 GMT) with an epicentre in Julian, California. |
| The resort town is located in the Cuyamaca Mountains about an hour north-east of San Diego. | The resort town is located in the Cuyamaca Mountains about an hour north-east of San Diego. |
| Around two hours after the earthquake, Perette Godwin, a spokeswoman for the City of San Diego, told the BBC there had been no reports of structural damage or injuries. | Around two hours after the earthquake, Perette Godwin, a spokeswoman for the City of San Diego, told the BBC there had been no reports of structural damage or injuries. |
| The San Diego sheriff's office also said it had not yet "received any reports of injuries or major damage caused by the earthquake," but said it was a "developing situation". | The San Diego sheriff's office also said it had not yet "received any reports of injuries or major damage caused by the earthquake," but said it was a "developing situation". |
| California Governor Gavin Newsom's office posted on X shortly after the quake that he had been briefed on the situation. | California Governor Gavin Newsom's office posted on X shortly after the quake that he had been briefed on the situation. |
| The USGS continued to report smaller aftershocks in the region in the hour after the quake. | The USGS continued to report smaller aftershocks in the region in the hour after the quake. |
| The National Weather Service, meanwhile, said a tsunami was not expected. | The National Weather Service, meanwhile, said a tsunami was not expected. |
| In the moments before it struck, emergency alerts issued by the USGS ordered residents to take shelter as far away as Los Angeles. | In the moments before it struck, emergency alerts issued by the USGS ordered residents to take shelter as far away as Los Angeles. |
| "Drop, cover, hold on. Protect yourself," the alert read. | "Drop, cover, hold on. Protect yourself," the alert read. |
| The quake's epicentre was in the resort town of Julian, California (file image) | The quake's epicentre was in the resort town of Julian, California (file image) |
| Kevin Manaugh was eating breakfast when he received an alert, and quickly took shelter under a door frame. | Kevin Manaugh was eating breakfast when he received an alert, and quickly took shelter under a door frame. |
| "Sure enough, the quaking started to happen," Mr Manaugh said. "I've lived in San Diego most of my life, I was born here, and this is probably the worst quake that I've ever felt." | "Sure enough, the quaking started to happen," Mr Manaugh said. "I've lived in San Diego most of my life, I was born here, and this is probably the worst quake that I've ever felt." |
| "It was a bit shocking," he continued. "Everything shook, it shook a lot. It rattled around and lasted maybe three seconds, and then it was over." | "It was a bit shocking," he continued. "Everything shook, it shook a lot. It rattled around and lasted maybe three seconds, and then it was over." |
| Though his house suffered no damage, Mr Manaugh said he would likely prepare in case another earthquake struck. | Though his house suffered no damage, Mr Manaugh said he would likely prepare in case another earthquake struck. |
| "Between this and the wildfires in Los Angeles, it made me think that it's probably a good idea to have an evacuation bag," he said. | "Between this and the wildfires in Los Angeles, it made me think that it's probably a good idea to have an evacuation bag," he said. |
| Earthquakes are notoriously difficult to predict, but the alert's lead time - about 15 seconds for Mr Manaugh - was enough to take action. | Earthquakes are notoriously difficult to predict, but the alert's lead time - about 15 seconds for Mr Manaugh - was enough to take action. |
| "The way they were able to predict that, it gave me time to get to a point of safety," he said. | "The way they were able to predict that, it gave me time to get to a point of safety," he said. |
| The USGS uses seismographs and other sensors buried in the ground throughout California to make a "lightning fast" detection when the earth starts to move, said Robert de Groot, a team lead for the agency's ShakeAlert system. | The USGS uses seismographs and other sensors buried in the ground throughout California to make a "lightning fast" detection when the earth starts to move, said Robert de Groot, a team lead for the agency's ShakeAlert system. |
| The sensors convey data to a processing centre, which helps scientists determine the strength and potential scale of the quake. | |
| "We use about a second's worth of data to determine what is going on," Mr de Groot said. USGS data is quickly distributed to Google and various earthquake apps to help warn residents. | "We use about a second's worth of data to determine what is going on," Mr de Groot said. USGS data is quickly distributed to Google and various earthquake apps to help warn residents. |
| In the case of larger quakes, like the one that struck Southern California on Monday morning, officials send a notification through the wireless emergency alert system to ensure it reaches anyone who could be in harms way. | In the case of larger quakes, like the one that struck Southern California on Monday morning, officials send a notification through the wireless emergency alert system to ensure it reaches anyone who could be in harms way. |
| On Monday, that included Mr de Groot, who felt the earthquake in Pasadena, 130 miles north of the epicentre. | On Monday, that included Mr de Groot, who felt the earthquake in Pasadena, 130 miles north of the epicentre. |
| He saw the alert, and quickly took cover under a table until the rattling stopped. | He saw the alert, and quickly took cover under a table until the rattling stopped. |
| "Nobody likes the ground shaking," he said, "even though earthquakes are my day job." | "Nobody likes the ground shaking," he said, "even though earthquakes are my day job." |