A seismic gap is a section of a known active fault that hasn’t ruptured in a long time compared to other segments. Seismologists believe these gaps are “overdue” for an earthquake because tectonic stress continues to build up there, making ...
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A seismograph is an instrument used to detect and record seismic waves (P, S and L waves). It consists of a weighted pen or electronic sensor that remains steady due to inertia while the surrounding frame moves with the shaking ...
Earthquakes are most commonly measured on the Richter scale. This is a logarithmic scale used to determine the magnitude of an earthquake, which is the total amount of energy released at the focus. While the Moment Magnitude Scale (Mw) is ...
The country where destructive ocean waves are traditionally and officially called Tsunamis is Japan. Due to its geographic position atop several converging tectonic plates, Japan has a long and tragic history with these events, leading them to develop the world’s ...
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 ...