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This topic has appeared in the trending rankings 1 time(s) in the past year. While it does not trend frequently, its appearance suggests a renewed or concentrated surge of public interest.
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Long_period_ground_motion entered the ranking for the first time today at position #. This is its highest position ever recorded.
This topic has appeared in the English Wikipedia rankings 1 time. It first appeared on 2026-04-13 and was most recently seen on 2026-04-13.
Long-period ground motion (LPGM) refers to seismic waves that occur during a seismic event, like an earthquake or nuclear explosion, that has a frequency typically defined as less than 1 Hertz. These long-period waves are particularly significant in the context of tall or long structures, like bridges and high-rise buildings, as their nature causes short-period waves to dampen significantly before reaching the points more distant from the seismic event. Furthermore, a frequency of around 1 Hz or less is also a frequency often found to resonate with these buildings. Although there is no official lower limit to the wave-frequency in LPGM, in terms of earthquakes, it is usually limited in scope between a 1 and 10 second period.
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