A mobile app that earlier this month alerted more than half a million people in Northern California in advance of two major shakes is now available for free on Chromebooks and MacOs.
The “MyShake” earthquake alert app, on Dec. 5 notified nearly 470,000 users on their mobile devices up to 15 seconds before the 7.0 quake in Humboldt County that triggered a tsunami warning along the California coast hit.
On Dec. 9 the app warned more than 150,000 users 10 seconds before shaking began from a 5.7 earthquake centered in Butte, Nevada near the California border…