31. The alteration of the Pacific Plate s motion caused a left-lateral strike-slip fault to form at the Pacific-Antarctic Boundary. 32. They also form where two segments of a strike-slip fault overlap, and the relay zone between the segments experiences transtension. 33. Both are strike slip faults nearly 1, 000 miles long, storing tremendous energy generated at the confluence of tectonic plates. 34. The "'geology of Chile "'is a result of the Andean and preceding Nazca and Antarctic Plates or shallow strike-slip faults . 35. It was during the Miocene, that these strata were translated to their present position by movement along detachment and strike-slip faults . 36. It has the characteristics of a strike-slip fault , in which one huge chunk of land slides by another one, she said. 37. During the Oligocene to Miocene, many of the basement faults were reactivated by the strike-slip faults during the Late Cretaceous inversion. 38. This suggests that the OWL was once a strike-slip fault , possibly a continental margin, along which terranes moved from the southeast. 39. Farther north and east, the ANS was affected by the formation of the great NW-SE trending Najd system of strike-slip faults . 40. Four of the region's known strike-slip faults and one additional newly discovered normal fault all broke the surface during the earthquake.