The Conjunto Residencial Belo Horizonte, twin apartment towers in the Venezuelan state of La Guaira, stood 16 stories high and offered sweeping views of the Caribbean Sea. Erick Rosas, a few weeks shy of his college graduation, was living with his family on the third floor, but when the shaking started on Wednesday, he was visiting his uncle, about 15 miles up the coast. It was a national holiday, commemorating a 19th-century battle that led to Venezuela’s independence, and Rosas was in the