DATE NAME PARTNER PERIODP INSTRUCTOR UNIT 4: Plate Tectonics and Earth\'s Interi
ID: 294745 • Letter: D
Question
DATE NAME PARTNER PERIODP INSTRUCTOR UNIT 4: Plate Tectonics and Earth's Interior LAB 4-5: FINDING EPICENTERS INTRODUCTION: Earthquakes occur when there is movement along a fault. The friction between rock masses rubbing against one another generates shock waves which travel through Earth. These shock waves (seismic waves) created by the earthquake are radiated in every direction from the focus, the point within Earth where the actual movement takes place. An earthquake occurs every 30 seconds, day after day. Most of these are so weak they would go unnoticed without the use of sensitive modern instruments called seismographs. While seismologists use many stations, in this lab you will use seismograms from three stations to locate the epicenter, the point on Earth's surface directly above the focus. distant OBJECTIVE: You will learn to interpret a seismogram and, using differences in seismic waves, locate the epicenter of an earthquake VOCABULARY fault: crack in eatrs crust epicenter: focus: focal depth: P-wave: S-wave: seismograph: seismogram: 165Explanation / Answer
Epicenter: The epicentre is the point on the surface of the Earth's crust right above the focus.
Focus: The focus is the point from where the earthquake originally originate under the surface of the earth and since the earthquake produce the seismic waves (body and surface waves) which are form of elastic waves therefore it is the point within the lithosphere (constituting the earth crust and the upper mantle) from where the elastic energy is released
Focal depth: The depth measured from the epicentre to the focus is known as focal depth. On the basis of focal depth, earthquakes can be classified as shallow focus, intermediate focus and deep focus earthquakes.
P Wave: It is a type of body wave elastic in nature in which the movement of particles are in the same direction as that of the motion of the wave. This type of wave is produced when an earthquake event happens or when any any thing hits the sufrace. It have the highest velocity possessed by any body or surface wave and it can travel in both fluids and solids.
S Wave: It is a type of body wave elastic in nature in which the movement of particles is perpendicular to of the motion of the wave. This type of wave is produced when an earthquake event happens or when any any thing hits the sufrace. It's velocity is less than that of a primary wave it can travel only in solids.
Seismograph: It is an equipment which is used to measure the itensity of the body and surface wave (P wave and S wave are body wave while Love and rayleigh waves are surface waves) produced during an earthquake or during other event.
Seismogram: The response of a seismograph for a particular seismic event is known as seismogram.
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