I was prompted to write this by recent Nepal earthquake. The Kola Peninsula too is full of shields and faults and layers in its foundation that have in the past moved and have a potential of starting to do so again.
What do you do if ground starts shaking? Stay where you are. If indoors, remain indoors. Crawl under a table. Hold onto its leg. If outdoors, remain there but stay away from building and tall structures. If in a car, stop it but not on a bridge or overpass. Drop, cover, and hold on is essentially the advice I was able to gather from a variety of source, eg. here. Don’t move around while the ground is shaking or danger of aftershock remains.
Those wishing to make a donation to the Nepal earthquake relief efforts may proceed here.