Detectors of these entities can have trouble at angular distances between 104 and 140 degrees due to refraction.
Detectors of these entities can have trouble at angular distances between 104 and 140 degrees due to refraction. That area is called the "shadow zone." One theory of these phenomena states that they take place due to the buildup of strain energy caused by friction between the hanging wall and the foot wall, which is released in an "elastic rebound." Early detection of these events is done by observing P-waves, which directly emanate from their focus. These events can occur along an inclined angle in areas called subduction zones. Often followed by aftershocks, for 10 points, name these events whose strength is measured on the Richter scale.
Detectors of these entities can have trouble at angular distances between 104 and 140 degrees due to refraction.
earthquakes