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Earth Movements — Geography STD 11 Commerce / Arts — Question

Maharashtra BoardEnglish MediumSTD 11 Commerce / ArtsGeographyEarth Movements3 Marks
Question
L-waves do not have a shadow zone.
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Answer

L-waves do not have a shadow zone because-
  1. The shadow zone is the area of the earth from angular distance of 105° to 140° from a given earthquake for both P-waves as well as S-waves.
  2. Generally, seismographs located at any distance withinl05° from epicentre record the arrival of S-waves and beyond 140° from epicentre record the arrival of P-waves.
  3. L-waves are typically generated when the source of the earthquake is close to the earth’s surface.

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