SAN JOSE, Calif. — Authorities continue to survey the damage wrought by a 6.4 magnitude earthquake early Tuesday that shook Humboldt County, California, residents off their literal foundations, with tens of thousands of people forced to spend another night in the dark as technicians work rapidly to restore power. Late Tuesday evening, PG&E announced that it had re-established service for about 40,000 customers — a figure that entails both homes and businesses — which represented a significant dent in the roughly 71,000 who lost electricity after the earthquake. By Wednesday morning, the utilit…