Geography 2152F/G Lecture Notes - Lecture 10: North American Plate, Jack Pine, Post-Glacial Rebound
7 Feb 2018
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Reading #3 review questions: describe what occurs in the lead-up to a megathrust earthquake. In the lead-up to a megathrust earthquake, tectonic plates move towards each other continuously, but can get stuck when in contact. When this happens over a long period of time, a massive build-up of strain is created. A core sample from the ocean floor can be found to include debris such as pieces of wood and rock. The proposed reason for the seismic activity on baffin island in nunavut was the occurrence of post-glacial rebound. The island is budging up 2 millimetres per year on its western edge. Motion sensors allow for the rapid detection and reporting of spreading seismic waves before they reach land. The next strong earthquake in the region is projected to occur before 2020. (320 year window, last megathrust earthquake occurred in 1700). Oil wells are considered deep water when they are deeper than 400m.
