Geol212 Planetary Geology
Gutenberg explained this Shadow Zone with a core which slowed and bent P waves Later, an S wave shadow zone was recognized, meaning no S waves were received at seismographs stations from 104o to 180o from an earthquake; The shadow zone of Swave is much larger than that of the Pwaves The shadow zone of Pwaves appears as a band around the earth between 105° and 145° away from the epicentre The shadow zone of Swaves is not only larger in extent but it is also a little over 40 per cent of the earth surface
S wave shadow zone indicate
S wave shadow zone indicate-Body Waves Surface Waves (i) P and S waves are called body waves (i)L waves are called surface waves (ii)These travel through the solid body of the earth (ii)These move along the free upper crust of the earth (iii)These do not pass through liquid medium (iii)These can pass through liquid medium and move at right angle to the surface of the earth7 Observe the path taken by P and S waves in the model planet Sketch the layers on your diagram and indicate if they are solid or liquid 8 What happens to the size of the S wave shadow zone as the diameter of the liquid layer increases?
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1) Sketch and describe P and Swave shadow zones How can we use P and S wave shadow zones to conclusively prove that Earth's outer core is molten?Seismic Shadow Zones S wave shadow zone The shadow zone results from S waves being stopped entirely by the liquid core Three different Swave phases show how the initial S wave is stopped (damped), or how it changes when encountering boundaries in theP waves travel more slowly in the outer core than in the lower mantle Liquids do not transmit S waves The S wave shadow zone is caused by the _____ the crustmantle boundary the outer core the lower mantle the inner core The Swave shadow zone extends from _____ to 180 o angular distance from the earthquake focus on one side and from
P waves are the fastest body waves and arrive at stations before the S waves, or secondary waves Their velocity in the crust varies between 50 and 70 km/s The waves carry energy through the Earth as longitudinal waves, moving particles in the same line as the direction of the wave P waves can travel through all layers of the EarthS wave An S wave, or shear wave, is a seismic body wave that shakes the ground back and forth perpendicular to the direction the wave is moving Questions or comments?This discovery was followed by the discovery of an Swave shadow zone The Swave shadow zone occurs because no Swaves reach the area on the opposite side of the Earth from the focus Since no direct Swaves arrive in this zone, it implies that no Swaves pass through the core This further implies the velocity of Swave in the core is 0
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P waves are refracted at the MantleOuter Core interface S waves are stopped at this interface;Wave wāv 1 a uniformly advancing disturbance in which the parts undergo a change in direction, such as a progressing disturbance on the surface of a liquid 2 variation in the transmission of electromagnetic energy, especially the periodic change in direction of a reading on a monitoring device A wave the wave on a His bundle electrogram that
Incoming Term: s wave shadow zone indicate,
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