Una piccola scossa di terremoto, di magnitudo 3.2 sulla scala Richter, è stata registrata a Basilea-Campagna poco dopo la mezzanotte. Il Servizio sismico svizzero con sede all'ETH di Zurigo precisa che il terremoto si è verificato a circa 7 chilometri a sud di Liestal a una profondità di 24,6 chilometri. Normalmente, da un terremoto di questa magnitudo non si attendono danni, e infatti la polizia cantonale ha confermato di non aver ricevuto avvisi di questo tipo.
La scossa però è stata chiaramente percepita nelle vicinanze. Nell'ora successiva, il Servizio sismico ha ricevuto circa 300 messaggi di persone che segnalavano di averla avvertita. Alcune di queste si trovavano a più di 70 chilometri dall'epicentro.
Nel corso del 2021, sono state circa un centinaio le scosse di terremoto registrate in Svizzera, tutte di entità lieve.
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