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.
दोन भूपट्ट जुळण्याच्या ठिकाणी घडलेले ज्वालामुखी लोकांकरता सर्वात धोकेदायक ठरतात.