E-Mail IMAGE: For a total of two years, 15 ocean bottom seismometers off northern Chile recorded aftershocks from the 2014 Iquique earthquake. view more Credit: Jan Steffen/GEOMAR Northern Chile is an ideal natural laboratory to study the origin of earthquakes. Here, the Pacific Nazca plate slides underneath the South American continental plate with a speed of about 65 millimetres per year. This process, known as subduction, creates strain between the two plates and scientists thus expected a mega-earthquake here sooner or later, like the last one in 1877. But although northern Ch...