A magnitude 6.2 earthquake shook Ecuador's coast early on Wednesday, terrifying locals and impeding rescuers after a bigger weekend quake battered the same area and killed nearly 500 people. The latest earthquake hit 25 km (15 miles) off Muisne on the northwest Pacific coast at a depth of 15 km, the U.S. Geological Survey (USGS) said. That was near the epicenter of Saturday's 7.8 quake, which devastated a long swath of the coast and dealt a major blow to the oil-producing nation's already fragile economy.