Question

Where do tectonic activities, such as earthquakes or volcanic eruptions, tend to occur?

Answer 1

They tend to occur at plate boundaries.

Answer 2

Well basiclly everywhere where there are faults and plate boundaries. So basiclly anywhere in the world. Since earthquakes are created by stress in faults or plate boundaries being released as seismic waves then everywhere in the world is at risk of an earthquake. Some places such as California, Japan, Indonesia, China, Greece, India, Nepal, Alaska, etc. are at higher risk of a major or minor earthquake mostly because there near or on a plate boundary thats more explosive or dangerous. As for everywhere else in the world many are at risk of small quakes such as 3's or 4's which are a decent size. So the answer to your question is that everyplace in the world is at risk of an earthquake.