–Britt Santowski, SPN
Every week, give or take, Pacific Aerospace & Electronics from Sequim, Washington, does what is called explosive welding, where they produce materials used for high intensity situations, like materials for spaceships and submarines. With explosive welding, two unbondable materials are welded together using a third metal, placed between the two incompatible ones. The high-intensity heat source required to meld the metals can only come through controlled explosions.
For a more detailed description of the process, read this article from PA&E, or this one.
In April, 2015, as a direct result of SPN inquiry, Joe Munn, an Operations Manager with PA&E crossed the border and visited Sooke to monitor an explosion from our waters. With him he had expensive equipment. Two kinds: One would go into the ground, so he could measure any ground movement when they were due to explode in Sequim; another would measure the airwaves.
I, Britt Santowski of SPN, was there first hand to witness both the explosion and the impact on the monitors.
As Munn explained in his conversation with the Sooke mayor, what is felt here in Sooke comes from the air, not from the earth, or the water. Because the reverberations are airborne, weather has a great influence on what we feel. A cloudy skies mean we feel it more on land; clear skies and the impact on earthdwellers is reduced.
This can be confirmed through monitoring the SPN Weather page, which has a live-streamed Canada Earthquakes monitor. On one blast that was particularly moving, SPN contacted the monitors directly. No earth movement was registered. It was PA&E blasting.
Since April, 2015, they attempt to accommodate their northern neighbour as best as possible by choosing days with fewer clouds (when they have flexibility in their schedule). And, they have tested with pointing the explosions in a number of directions, and determining which ones caused the fewest air wave reverberations.
Since that April in 2015, PA&E contacts SPN in Sooke, along with a few others, to notify us of when they are blasting. Those of us who receive notice notify our contacts.
If you wish to contact PA&E with any of your concerns, here is their contact information:
2249 Diamond Point Road
Sequim, WA 98382 USA