-What drives plate motion? Rocks with a lot of stress put on them, the stress is released as an earthquake. Earthquakes come all along the subducting slab, as you go downwards down the slab the earthquakes range from intermediate to deeper earthquakes. Really deep earthquakes occur at subduction zones. And they happen in the interior if continents, far away from plate boundaries. -Alaska had an earthquake in 1964. -A tsunami is a secondary effect of an earthquake, it occurs when there is faulting on the seafloor. Underwater landslides also make tsunami?s. -Seismic waves radiate and travel in all directions. -Seismic stations: wave arrives at closer seismic stations first. - Earthquakes occur on faults when stress is relieved. - One of the largest earthquakes in recent memory, occurred in Indonesia.
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