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Development of seismometry and seismic tomography in Croatia

The first “ true” seismograph – according to Agamennone (1906) – was built in Italy in 1875 by F. Cecchi. The apparatus incorporated two common pendulums for horizontal motions, a mass on a spring sensitive to vertical oscillations, and even a sensor for rotational motions. Cecchi installed a triggering device that started the motion of a recording surface when an earthquake was detected, thus probably producing the first time-history of earthquake waves. The first known seismogram of a distant earthquake was obtained by E. von Rebeur- Paschwitz in 1889, who recorded in Potsdam a large event in Japan (Fig. 2). The instrument, consisting of small horizontal pendulums was constructed for astronomical purposes, to measure small changes in the direction of the vertical. Von Rebeur-Paschwitz was the first to use photographic recording for continuous seismological measurements. The instrument was later improved by R. Ehlert.

seismometry; inverse problems

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