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earthquakes

definitions

QuestionAnswer
Epicenter point on earths surface directly above an earthquakes focus.
Fault Fracture that occurs when rocks break and that results in relative movement of oppossing sides;can form as a result of compression(reverse fault) being pulled apart(normal fault) or sheer(strike slip fault).
Focus point deep inside earth where energy is released causing an earthquake.
Lava molten rock flowing onto earth's surface.
Lithosphere ridg layer of earth about 100km thick, made of the crust and a part of the upper mantle.
Magnitude A measure of the energy released by an earthquake.
Rifts long crack,fissure, or trough that forms between tectonic plates moving apart at plate boundaries.
Seismic Safe describes the ability of structure to stand up against the vibration caused by an earthquake.
Seismic Waves earthquake waves, including primary waves, secondary waves, and surface waves.
Surface waves The slowest and largest of the seismic waves, and they can cause most of the destruction during an earthquake.
Seismograph instrument used to measure seismic waves.
Tsunami powerful seismic sea wave that begins over a ocean- floor earthquake, can reach 30m in height when approching land, and can cause destruction in coastal areas.
Volcanoes cone-shaped hill or mountain formed when hot magma,solids,and gas erupt onto earth's surface through a vent.
Pyroclastic flow another hazard for inhabitantss of montserrat.
Richter Scale The amplitude of the highest recorded seismic wave increased by 10.
Created by: nora15
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