The seismic station COI, located in Coimbra, Portugal, is the oldest seismic station in Portugal and among the oldest in the world. Experimental seismic recording began in 1891 with an Angot seismograph (V. G. S. S. Santos, unpublished data, 1995; Custódio et al., 2010). Continuous recording of ground motion began in 1903 with a Milne seismograph, and is still on‐going at the same site, now with a broadband Streckeisen STS‐2 seismometer. Coimbra’s observatory owns an over 100‐year long, well‐preserved collection of seismograms, seismographs and bulletins. Station COI is taken into account in early seismological works, for example, in...
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