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Article Dans Une Revue Seismological Research Letters Année : 2010

The GEOSCOPE Program: Progress and Challenges during the Past 30 Years

J.-P. Montagner
B. Romanowicz
  • Fonction : Auteur
M. Cara
  • Fonction : Auteur
D. Rouland
  • Fonction : Auteur
R. Pillet
  • Fonction : Auteur
L. Rivera
  • Fonction : Auteur
A. Maggi
  • Fonction : Auteur
Team Geoscope
  • Fonction : Auteur

Résumé

The Institut de Physique du Globe in Paris (IPGP) has a solid tradition in long-period seismology and instrumentation. The IPGP Seismological Laboratory designed handmade instruments from 1952 to 1982, mainly to study the Earth tide tilt. After several attempts, the first prototype of a tiltmeter was constructed in 1957 by P.A. Blum (Blum and Jobert 1959; Blum et al. 1964). This sensor was a horizontal mechanical seismograph with classical Zöllner suspension (Zöllner 1869), made of fused silica working under vacuum (Figure 1A). Optical amplification and photographic recording at a velocity of 1 cm/h were used. Earthquakes were then visible only as a thickening of the recording line. The recording of the large event of 22 May 1960 in Chile, however, clearly showed long-period waves lasting several minutes (Figures 1B and 1C) and raised the question of the usefulness of tiltmeter records for earthquake studies. At that time and during the following decade, the study of large earthquakes, such as those in Chile in 1960 or Alaska in 1964, involved processing time series longer than 24 hours at each station. This data processing took several months due to the tedious procedure of digitization, which introduced additional errors (Cifuentes and Silver 1989).
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Dates et versions

hal-00498290 , version 1 (07-07-2010)

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Citer

G. Roult, J.-P. Montagner, B. Romanowicz, M. Cara, D. Rouland, et al.. The GEOSCOPE Program: Progress and Challenges during the Past 30 Years. Seismological Research Letters, 2010, 81 (3), pp.427-452. ⟨10.1785/gssrl.81.3.427⟩. ⟨hal-00498290⟩
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