Five years after Magna residents and others in the Salt Lake Valley were awakened by an early morning earthquake, the community is still being rebuilt.

Utah’s worst disaster is only a coin flip away within the next half-century — and experts say they don’t want the prospect of that imminent and devastating earthquake to fade from public attention.

Its guiding slogan: “Be Ready Utah.” “Utah is NOT prepared for a major Wasatch fault earthquake,” said a 2015 report from the Earthquake Engineering Research Institute, a national ...