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Natural Frequency
frequency at which an object vibrates when pushed by a single force/impulse
Normal Fault
the rock mass above an inclined fault moves down
Oceanic spreading ridge
fracture zone along ocean bottom; molten mantle comes to surface, creating new crust
Plate tectonics
The study of the distribution and movement of Earth's tectonic plates
Recurrence interval
Average time between earthquake occurrences on a fault/in a source zone
Richter scale
numerical scale expressing the magnitude of an earthquake
Ring of Fire
zone of earthquakes surrounding the Pacific Ocean
Sea floor spreading
divergent boundary causing two plates to move away from one another