Tectonic definitions Definitions related to plate tectonics and natural hazards 0.0 / 5 ? GeographyPlate tectonicsNatural hazardsASWJEC Created by: sarahhw0506Created on: 03-05-16 12:43 the point within the crust where an earthquake starts. The shallower the _____, the greater the shaking on the surface. Focus 1 of 12 the point immediately above the focus on the surface of the earth. Epicentre 2 of 12 this causes the plates to stick as they try to move past each other. Friction 3 of 12 this builds up as the plates stick. Pressure 4 of 12 these are waves of energy that travel out from the focus in all directions. Seismic Waves 5 of 12 these are cracks in the crust which energy is released along. Faults 6 of 12 used to measure the strength (magnitude) of an earthquake. Seismometers 7 of 12 a large volcanic crater, especially one formed by a major eruption leading to the collapse of the mouth of the volcano Caldera 8 of 12 a dense, destructive mass of very hot ash, lava fragments, and gases ejected explosively from a volcano and typically flowing at great speed Pyroclastic flow 9 of 12 having a thick, sticky consistency between solid and liquid; having a high viscosity Viscous 10 of 12 a twelve-point scale for expressing the local intensity of an earthquake, ranging from I (virtually imperceptible) to XII (total destruction) Mercalli Scale 11 of 12 rock fragments and particles ejected by a volcanic eruption Tephra 12 of 12
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