Large pedestrian crowds generate distinctive seismic signals depending on their collective behavior, according to a new study that includes data from Tokyo schools and outdoor gatherings in the United States and Israel. These seismic signals are strongest in the 1–2 hertz frequency band, which is consistent with human walking frequencies.

Large pedestrian crowds generate distinctive seismic signals depending on their collective behavior, according to a new study that includes data from Tokyo schools and outdoor gatherings in the United States and Israel. These seismic signals are strongest in the 1–2 hertz frequency band, which is consistent with human walking frequencies.

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