Comunicación presntada a la 3ª Asamblea Hispano-Portuguesa de Geodesia y Geofísica = 3ª Assembleia Luso-Espanhola de Geodesia e Geofisica, celebrada en Valencia entre el 4 y el 8 de febrero de 2002.The strain response of the Earth to tidal forces is observed in the Geodynamics Laboratory of Lanzarote Island.
The instruments, installed in a gallery inside the lava tunnel of Cueva de los Verdes, are kind of horizontal
ceramic-tube extensometers. Their base fines comprise from 8 to 38 m length and are orientated in two orthogonal
directions (45º.2 N Y 135°.2 N), which depend on the situation in the gallery. The reliability of this instruments,
which measure the variation of distance between two fixed points with a resolution of 10 -10, allow us to dispose
long term series of tidal strains since 1992. The data series are analysed in order to study the stability of the
instruments. Also, with these data we can determine the tidal strain models, as well as the tidal deformation and the
long-term variations of strains in this island. Due to the dependence of the local conditions of the station, which is
located in an island, the oceanic influence will be investigated together with local atmospheric disturbing effects.
These effects are carefully studied for this station, in order to allow the identification and, if possible, its separation
from other signals of interest, given the volcanic feature of the island.Peer reviewe
