A major quake of magnitude 7.5 struck the Peruvian-Brazilian border in the Amazon basin on Tuesday, the U.S. Geological Survey said, according to Reuters. The quake, initially reported as a magnitude 7.1, was centered 184 miles (296 km) northwest of the Peruvian city of Puerto Maldonado. It was very deep, 374.3 miles (602 km) below ground, and in a sparsely populated jungle area so was unlikely to cause much damage or casualties.