Issue Eur. Phys. J. Appl. Phys. Volume 47, Number 1, July 2009 4th Colloquium Interdisciplinary in Instrumentation (C2I) Article Number 12705 Number of page(s) 4 Section 4th Colloquium Interdisciplinary in Instrumentation (C2I 2007) DOI 10.1051/epjap:2008186 Published online 17 February 2009

Eur. Phys. J. Appl. Phys. 47, 12705 (2009)
DOI: 10.1051/epjap:2008186

Seismo-ionosphere detection by underground SQUID in low-noise environment in LSBB-Rustrel, France

G. Waysand¹, P. Barroy², R. Blancon³, S. Gaffet⁴, C. Guilpin⁵, J. Marfaing⁶, E.P. Di Borgo³, M. Pyée⁷, M. Auguste¹, D. Boyer¹ and A. Cavaillou<sup>1

1</sup>  Université de Nice Sophia-Antipolis, Observatoire de la Côte d'Azur, Laboratoire Souterrain Bas Bruit de Rustrel-Pays d'Apt (LSBB), La Grande Combe, 84400 Rustrel, France
²  Université Paris XIII, LPMTM, Institut Galilée, 93430 Villetaneuse, France
³  Université d'Avignon et des Pays de Vaucluse, Département de Physique, Rue Louis Pasteur, 84000 Avignon, France
⁴  Université de Nice Sophia-Antipolis, GéoSciences-Azur, 250 rue Albert Einstein, 06500 Sophia-Antipolis, France
⁵  Université Paris7-Denis Diderot, 2 Place Jussieu, 75005 Paris, France
⁶  Universites Aix-Marseille IM2NP, UMR 6242 CNRS, Faculté des Sciences et Techniques, Avenue Normandie Niemen, 13397 Marseille Cedex 20, France
⁷  Université d'Orléans, LPCE CNRS, 3A av. de la Recherche Scientifique, 45071 Orléans, France

georges.waysand@oca.eu

Received: 30 May 2008 / Received in final form: 4 July 2008 / Accepted: 14 October 2008 / Published online: 17 February 2009

Abstract
The permanent operation of a 3 axes SQUID magnetometer in the LSBB below 550 m of calcite rock is a unique system of magnetic observation: a rejection rate better than 3 fT/Hz over 40 Hz. The observation of magneto-ionosphere responses to P wave emissions both at the epicentre and at their arrival at LSBB for earthquakes of magnitude larger than 3 is reported. A simple model predicts the starting time of these events. These results are compared with those provided by Doppler sounders for ionosphere responses to Rayleigh waves.

PACS
91.10.Vr - Ocean/Earth/atmosphere/ hydrosphere/cryosphere interactions; mass balance.
94.20.Bb - Wave propagation.
85.25.Dq - Superconducting quantum interference devices (SQUIDs).

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