Alex Bielfeld Created: July 29, 2021 04:24 PM ROCHESTER, N.Y. (WHEC) — An 8.2 magnitude earthquake rumbled off the coast of the Aleutian Islands in Alaska at around 2:15 a.m. EST Thursday, which was 10:15 p.m. Wednesday in Alaska. This earthquake prompted numerous tsunami watches and warnings from Alaska to Hawaii, but luckily no tsunami took place. Locally, the seismograph at McQuaid Jesuit High School picked up on the quake as the earthquake “waves” passed through the Rochester region just 10 minutes after the initial strike. News10NBC First Alert Meteorologist Alex Bielfeld spoke with Colin Orr, a science teacher at McQuaid Jesuit High School, to learn more about how a seismograph works and how it measures the strength and location of an earthquake.