Yesterday's earthquakes in Colorado and Washington took place in areas of low earthquake hazard. But there is no area on Earth completely immune from seismic activity.
Eight earthquakes shook southern Colorado yesterday and last night (August 22 and 23, 2011) according to the USGS. The largest earthquake was magnitude 5.3.
On Sunday, August 21, 2011, a strong EF2 or weak EF3 tornado with winds around 130-150 miles per hour, struck parts of Goderich, Ontario killing one person and injuring at least 37 people.