CTA Vibration Monitor Records Recent Earthquake

November 13, 2020

Many of us in Eastern Massachusetts felt the ground shake Sunday morning, caused by a magnitude 3.6 earthquake centered off the southern coast of Massachusetts.   I was at my desk in Sudbury, seventy miles from the epicenter, and felt it clearly.

By coincidence, Doug Bell and I had installed a vibration monitor just the day before in Newton, on the third floor of a large steel-frame office building.  The vibration monitor is connected to the internet, so I was able to access the data right away from my office.  The time history showed a major vibration event at 9:10 A.M, coinciding with the time of the earthquake as reported by the Weston Observatory.

Earthquakes are rare in Massachusetts, and I feel lucky to have recorded one.

– Ted