Benito Quivera was in his underwear, about to get in the shower late Wednesday afternoon when his phone emitted a shrill alarm. His Caracas apartment began violently shaking. “I had never heard it before, and then suddenly everything began to move that was so strong—so strong—that I ran to the closet and began to pray,” the 57-year-old said. “It all kept going and I said, ‘Oh God, please, why is this taking so long, why?’ ” It was about 6 p.m., and a 7.2-magnitude earthquake had just struck north of the city. Then, 39 seconds later, an even stronger 7.5-magnitude…