Question

Earthquake and volcanic activity are unevenly distributed around the globe. In some places, earthquakes and volcanic activity occur together. In other places, earthquakes are common without volcanic activity. Answer parts A-C below. Plan on about 1 page total for your final answer. Feel free to use the extra pages at the back as needed. A) Using plate tectonic terms, list where one would find earthquake activity without significant volcanic activity B) Using plate tectonic terms, list where one would find earthquake activity associated with significant volcanic activity C) Using plate tectonic terms, list where one would find volcanic activity without significant earthquake activity

Answer 1

(A) In a divergent plate motion, the two plates move away from each other. and in the transform plate motion, the two plates slide past each other. Due to these two types of motions, the shallow focus earthquakes are generated without any volcanic activity.

(B) In a convergent plate motion, the two plates move towards each other. As a result of which the denser plate gets subducted below the less denser plate and creates a subduction zone. Here the partial melting of the subducting plate takes place due to the dehydration of plates and this magma rises up towards the earth's surface forming volcanoes on the overriding plate. This type of plate motion produces deep-focus earthquakes with significant volcanic activities.

(C) In the region of hotspots and the mantle plumes, where the magma rises from the core-mantle boundary, there will occur significant volcanic activities without any earthquakes.