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Every day I check local earthquakes as monitored by the USGS and the Southern California Earthquake Data Center. The USGS-Caltech Seismic Net notes the nearest city of the occurrence as well as the magnitude and the time. All the quakes listed below are for those quakes occurring nearest to the city of Redlands.
Generally speaking, you can't feel anything if the magnitude is less than 2.5. If it's 3.0 or higher, you know it when it occurs. For those between 2.5 and 3.0, it depends. If you're in motion (walking), you probably won't feel it, but if you're sitting or standing still, you probably will. However, it seems that if you're lying down and awake, you'll probably notice any earthquakes with a magnitude of 1.7 or higher.
Severe earthquakes can be felt hundreds of miles away. The Easter Sunday earthquake (April 4, 2010) in Mexicali, Mexico registered a 7.2 in magnitude. We felt that one here in Redlands and the water in the swimming pool kept sloshing back and forth for about ten minutes after the quake subsided. Mexicali is about 145 miles southeast of Redlands.
September 10, 2019 - We felt some movement today from a 4.0 quake in Wildomar, which is about 50 miles away. It occurred at 1:21 PM.
July 5, 2019 - Another big shaker today at 8:19 PM. The epicenter was in Ridgecrest, which is right next door to Trona and the magnitude was five times stronger at 7.1.
July 4, 2019 - Today we were shaken at 10:33 AM by a 6.4 magnitude quake in Trona, Searles Valley, CA, which is about 140 miles north of us. The ceiling fans were swaying.
February 14, 2018 - We were shaken at 5:47 PM by a 3.3 magnitude quake in Mentone, which is about three miles away.
September 5, 2018 - Today we were in Aguanga, CA to see Ricardo Breceda's Gallery. Aguanga is a very active seismic area with close to 7,000 recorded earthquakes in the past 12 months.
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