The main zone for these phenomena in at least the western world is the Circum-Pacific Ring of Fire Belt. This is exemplified by the Western Cordillera in BC (Rockies and Coast Mts) in BC with a few inactive volcanoes, the volcanoes on the western margin of the US such as in Northern Californa and the Sierra Nevada, and the volcanoes in western and central Mexico and then the Andes with its' frequent western volcanoes and then in Japan and Indonesia with their volcanoes as well. Earthquakes are common in this Belt and occur due to plate movements including subduction below the BC coast and under the Andes.
