Well the shop is only 18 feet above high tide but at least the donut mill is on high ground. The north west had one of these mega quakes in 1700 and the geologist say they happen every 200 years?
And I thought we were low!
You should be somewhat protected from the wave by the distance as well as being on the same side as the quake, but you best keep your feet firmly planted, there could be more coming.