Seismic ‘whiplash’ – new research shows what happens when earthquakes stop suddenly
Researchers have directly observed how large earthquakes stop by analyzing seismic recordings, identifying a 'stopping phase' that records the moment an earthquake halts. The discovery provides new insights into earthquake behavior and could help with disaster planning.
Scientists have directly observed how large earthquakes come to a halt by analyzing seismic recordings taken near faults. They identified a 'stopping phase' signal that records the moment an earthquake stops, providing evidence that large ruptures stop suddenly rather than slowing down gradually. The research focused on large strike-slip earthquakes, where the ground moves sideways along near-vertical faults. Using seismic, GPS, and satellite data from 12 earthquakes worldwide, the team found consistent patterns of ground motion at the ends of faults. The stopping phase is characterized by a sudden reversal in ground movement, creating a 'whiplash' effect. The findings could help identify where shaking may be strongest along strike-slip faults, aiding disaster planning and preparation.
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