Outcrop of La Laja backthrust in Pleistocene gravels. A 7.4 magnitude earthquake on the fault destroyed the city of San Juan in 1944. PhotoID104
Outcrop of La Laja backthrust in Pleistocene gravels. A 7.4 magnitude earthquake on the fault destroyed the city of San Juan in 1944. PhotoID104
Photograph: Cees Passchier, Mainz