GeologyVocab

GeologyVocab - surface waves - cause damage to buildings,...

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Subject: Environmental Geology Session: Chapt 6-10, 16 Vocabulary at 10:41 PM Chapter 6 - Earthquakes epicenter - location of Earth's surface above focus • focus - point at depth where the rocks ruptured to produce an earthquake • moment magnitude - measure of the energy released by the earthquake • Modified Mercalli Scale - 12 divisions of intensity based on observations concerning severity of shaking during an earthquake • shake map - extent of potential damaging shaking following an earthquake • earthquake - when stress of rocks is forces them to rupture • fault - fracture or fracture system along which rocks has been displaced • tectonic creep - gradual displacement not accompanied by felt earthquakes • slow earthquakes - earthquakes produced by fault ruptures that last from days to months • P waves - compressional waves = faster, travel through solid, liquid, gas • S waves - shear waves = slower, travel only through solids
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Unformatted text preview: surface waves - cause damage to buildings, slowest seismogram - written or digital record of an earthquake material amplification - amplitude of shaking or vertical movement is greatly increased increased in unconsolidated sediments such as silt and clay deposits directivity - amplification effect resulting from intensity of seismic shaking that increases in direction of fault rupture earthquake cycle - drop in elastic strain after earthquakes, build-up of strain leading to next one liquefaction - transformation of water-saturated graunlar material from solid to liquid tsunami - large waves produced by sudden vertical displacement of ocean water Chapter 7 - Volcanic Activity magma - molten rock lava - magma that has emerged onto the surface shield volcano - largest, non-explosive, low silica content composite volcano - cone shaped, intermediate silica = explosive & runny...
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GeologyVocab - surface waves - cause damage to buildings,...

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