How Earthquakes Are Caused When any two plates collide, some sort of activity is bound to take place. A specific type of boundary is a convergent plate boundary. At this type of boundary, two plates are moving towards each other. Neither plate is subducted into the mantle. Many things happen when plates drive into each other. Including volcanic activity. When two continents are on the edges of plates, the land crumples, and is deformed. There are numerous earthquakes as these mountains are formed. When two plates with sea floor boundaries collide, mountains do build up, but are rarely visible