A First Motion Study looks at whether the very first movement of a P-wave on a seismogram is an “up” (compression) or “down” (dilatation). By mapping this across many stations, scientists can determine if the fault was a normal, reverse ...
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Shallow-focus earthquakes occur within the Earth’s brittle lithosphere, typically between 0 and 70 km deep. These are the most common and often the most destructive types of earthquakes because their energy reaches the surface with minimal loss of intensity. ANSWER: ...
Slow Slip Events (SSEs) occur at the deeper part of subduction zones. Unlike regular earthquakes that release energy in seconds, these “silent” earthquakes release energy over days, weeks or even months. They are detected by GPS sensors rather than traditional ...
S-waves are shear waves that move by displacing atoms perpendicular to the wave’s path. This requires “shear strength,” which only solids possess. Since the outer core is a liquid (molten iron and nickel), it has no shear strength, causing S-waves ...
The Richter scale “saturates” (fails to distinguish) between very large earthquakes (above 7.0) because it only measures peak wave amplitude. The Moment Magnitude Scale (Mw) measures the total energy by considering the fault area and the amount of slip, providing ...