Shadow Zone & Types of EQ
Propagation of EQ waves AsEQ waves moves causes vibrations in the body P-wave vibrate parallel to the direction of wave This leads to stretching & squeezing actions Other waves vibrate perpendicular to the wave direction This creates troughs and crests Other wavesvibrate perpendicular to the wave direction .
P wave compressions dilations wave direction S wave wavelength
Emergence of shadowzone Shadow zones- areas where waves are not reported For S-wave-entire zone beyond 105 degrees from epicenter . Covers 40% of the earth surface .For P-wave->zone between 105 to 145 degrees from the epicenter
Liquid outer core Bolid inner core P-wave shadown zone P-wavo shadow zonc Mantle P-wavos S-waves
S and P waves felt shadow zone: S and P waves felt very weak P waves S wave P wave outer core inner core only P waves felt mantle H crust Timing and strength of SCISmic waves gives us a picture of the interior. S waves absorbed shadow zone P waves refracted at core boundary
Types of Earthquake An earthquake, simply defined as the shaking of the earth's surface. On the basis of depth of focus, earthquakes are classified into three types. Following are the three types of earthquakes Types Shallow Earthquake Intermediate Earthquake Deep Earthquake Depth of focus (km) 60 60-300 >300
Types of Earthquakes 1. Tectonic EQ-> most common -h> due to sliding of rocks along a fault plane 2. Volcanic EQ-> confined to areas of active volcanoes 3. Collapse EQ->in the areas of intense mining activity 4. Explosion EQ->due to explosion of chemical or nuclear devices 5. Reservoir Induced EQ->in the areas of large reservoir
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