Sleep across the Sierra was cut short early Friday when a pre-dawn earthquake near Silver Springs, Nevada, sent a sharp jolt from Reno and Lake Tahoe out to parts of the Sacramento Valley. The shaking lasted several seconds in many spots, triggered hundreds of reports from startled residents, and, according to emergency officials, brought no immediate reports of major damage or injuries.<\/p>\n
Where and how strong<\/p>\n
According to the U.S. Geological Survey<\/a>, the quake hit at 8:17 a.m. UTC (1:17 a.m. Pacific) and was initially logged with a preliminary magnitude of 5.2. A reviewed listing from the Nevada Seismological Laboratory later placed the epicenter roughly 11 to 12 miles southeast of Silver Springs and revised the magnitude to about 4.9 after analysts took a closer look at the instrument data.<\/p>\n Where it was felt and impacts<\/p>\n More than 1,600 people filed \u201cfelt\u201d reports in the hours after the quake, and exposure estimates suggested several thousand people were in areas of moderate shaking, with tens of thousands more in zones of light shaking. As reported by SFGATE<\/a>, there were no immediate accounts of serious damage or injuries.<\/p>\n Part of an active swarm<\/p>\n Seismologists say this latest jolt is part of an energetic sequence near Silver Springs that has produced dozens of small quakes since mid\u2011April, including a stronger M5.7 mainshock on April 13. The Nevada Seismological Laboratory has told local outlets that the activity appears to involve a previously unmapped fault crossing the Dead Camel Mountains – \u201cThis earthquake sequence is on a fault we didn\u2019t know about before it started,\u201d NSL Director Christie Rowe told the Record\u2011Courier<\/a>.<\/p>\n Officials and safety steps<\/p>\n According to the U.S. Geological Survey<\/a>, residents in the region should be prepared for aftershocks and follow \u201cDrop, Cover and Hold On\u201d during any shaking, then check for structural or utility damage and secure items that could fall. People who felt the quake are encouraged to file a report with the U.S. Geological Survey<\/a> \u201cDid You Feel It?\u201d tool to help scientists better map where and how intensely the ground moved.<\/p>\n