Napa, Sonoma,Vallejo, and Fail-field were less than 15 miles from the epicenter [of the August 2014 earthquake]. Almost all (93%) of the UP wearers in these cities suddenly woke up at 3:20AM when the quake struck. Farther from the epicenter, the impact was weaker and more people slept through the shaking. In San Francisco and Oakland, slightly more than half (55%) woke up. As we look even farther, the effect becomes progressively weaker-almost no UP wearers in Modesto and Santa Cruz (and others between 75 and 100 miles from the epicenter) were woken up by the earthquake, according to UP data. Once awaken[ed], it took the residents a long time to go back to sleep, especially in the areas that felt the shaking the strongest. In fact, 45% of UP wearers less than 15 miles from the epicenter stayed up the rest of the night.
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