Here are some websites you may find useful for finding some trails, routes, state laws concerning cycling, and other stuff. Check these out, because knowing stuff is good.
Bicycling in Washington | WSDOT
Trails | Snohomish County, WA - Official Website
Bike Snohomish County - Washington Bikes
Cycling Maps for Whidbey and Camano Islands
For cyclists who enjoy the wind in their hair, cycling Island County's farmland flats, hair-raising downhills and technical mountain biking trails is sure to please.
Riding a bike during an earthquake would likely be an unsafe situation. An advance warning, even a few seconds, can provide enough time to stop before the ground starts shaking. There might be enough time to take additional steps for your safety.
The ShakeAlert earthquake early warning detection system is now available https://www.pnsn.org/pnsn-data-products/earthquake-early-warning.
To activate this notification on your phone you can turn on a system setting. (It is not a separate phone app). To learn more about turning on the detection capability on your phone go to https://mil.wa.gov/alerts.
Also, the latter part of this KING 5 video shows how to turn on iphone and android emergency alert notifications. https://www.king5.com/video/entertainment/television/programs/new-day-northwest/live-with-glenn-farley-new-day-nw/281-dd3452ce-0fb6-4df1-bd63-dc86dac0cae8.
On some android phones, look in the Messages app, then Settings, the Emergency Alert Settings, then Emergency Alerts.