5.7 Earthquake - North Pacific Ocean, 100 km west of Nicoya, Provincia de Guanacaste, Costa Rica

"A strong magnitude 5.7 earthquake occurred in the North Pacific Ocean near the coast of Costa Rica around noon at 12.56 pm local time (GMT -6). The quake had a very shallow depth of 27 km (17 mi) and was not felt (or at least not reported so)." Ukrin