World Regional Geography
13 October 2018
From the mapping of earthquakes this week, it is possible to recognize the relationship that exists between earthquakes and plate boundaries. The plate boundaries that were most active this week were North American Plate and Juan de Fuca Plate. In these areas, the earthquakes were more frequent in the narrow zones which were close to the ridge. The tectonic plates that were colliding in these particular locations. There was an occurrence of subduction zones where the less dense plates collided with the denser plate. After the collision, the plate that was forced under was total melted and destroyed. Collision, in this case, occurred when the continental crust meet oceanic crust. After this, there was a mountain formed as a result of subduction of the denser oceanic crust. The other collision that occurred was when the continental crust meets with the continental and when oceanic crust meets with the oceanic crust. The earthquake distribution map also shows some particular faults that were active last week. The majority of earthquakes are in the States of California, Nevada, and Utah where active faults located. Besides, some earthquakes occurred away from the faults as well. For example, they are in Oklahoma, Tennessee, and Missouri. Earthquakes that occurred away from faults or plate boundaries are known as intraplate earthquakes. One of the popular intraplate earthquakes is in Mineral, Virginia on August 23, 2011, with an estimated magnitude of 5.8. It caused an economic loss of 200 to 300 millions dollars.