Question

Give a geographical reason:

L-waves do not have a shadow zone.

Answer 1

L-waves do not have a shadow zone because -

1. The shadow zone is the area of the earth from an 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 within 105° from the epicenter record the arrival of S-waves, and beyond 140° from the epicenter 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.