Our son's house in Virgina has some long, not deep but more superfical, cracks in the concrete basement floor from last years earthquake. They also discovered a 4 foot long 1/4 inch crack that angles down the ciderblock wall in the crawlspace in another area of the house. Evidently this crack allowed water in which started to flood the basement during a recent major storm.

Homeowner's insurance says they don't cover damage from earthqakes.

How can this be repaired? What are your recommendations? Thanks!