Broadly speaking, the theory of plate tectonics says that earthquakes and volcanoes will occur in similar regions ​ — in rifts, especially oceanic rifts; in earth’s crust, where magma rises from the mantle through fissures; and at subduction zones, where one plate plunges under another.
प्रशांत महासागर के देशों में, जिन्हें रिंग ऑफ फायर (आग का घेरा) कहा जाता है, जगह - जगह इस तरह के सैकड़ों ज्वालामुखी पाए जाते हैं ।