A mid-afternoon San Jose del Cabo earthquake startled shoppers and airport travelers, knocking bottles from shelves and dislodging ceiling panels. Mexico’s seismic service posted a preliminary magnitude of 4.3. A U.S. agency later showed 4.8 using a different scale. Civil Protection crews fanned out to check buildings as videos of supermarket aisles and the airport’s check-in area spread on social media. Here’s what we verified, what the magnitud…