Maritsa Villareal sits near the debris of her home affected by Wednesday's earthquake, in Nosara, 290 km northeast of San Jose, Costa Rica, on Sept. 6, 2012. Costa Rica's Earthquake and Volcano Observatory counted 530 aftershocks by 13:30 GMT Thursday, including one with a magnitude of 5.1 and three others above 4, after the 7.6-magnitude quake that affected the country on Wednesday. [Xinhua]