Alan Kafka
Weston Observatory
Department of Earth and Environmental Sciences
Boston College

On July 4, 2019, two large earthquakes, magnitude 6.2 in Western Canada and magnitude 6.4 in Southern California, were recorded by Weston Observatory. Below are Weston seismograms of these earthquakes. (Top quake is Western Canada, bottom is Southern California.)

For more information about these earthquakes see:

This is the largest earthquake to hit Southern California since 1999 (CNN)

M 6.4 – 12km SW of Searles Valley, CA (USGS)

M 6.2 – 196km WSW of Bella Bella, Canada (USGS)