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Comparative study of the tidal gravity parameters observed in Timanfaya, Jameos del agua and Cueva de los Verdes stations at Lanzarote island

AuthorsVieira, Ricardo ; Ruymbeke, M. van; Arnoso, José ; D'Oreye, N.; Fernández Torres, José ; Toro y Llaca, Carmen de
Issue Date1995
PublisherScience publishing
CitationProceedings of the Twelfth International Symposium on Earth Tides, Beijing, August 4-7, 1995. p. 41-52 (1995)
AbstractThe Island of Lanzarote, and the Canarian Archipielago, placed near the western African coast of Moroco has a volcanic origin, like all Canary Islands. The last eruptions in the island have taken place in the: XVII and XIX centuries. A very important eruption has ocufred between 1730 and 1736. which is one of the most prolonged volcanic manifestarion that we have information about. It has caused important cbanges in the topography of the island, affecting almost 25% of its surface. As a consequence of this eruption, Possibly due to a remaining superficial magma, there is a zone of strong geotermic anomalies. Thus, in the National Volcanic Park of Timanfaya can be measured now temperatures of 6O0º C order, only a few meters depht. Island's crust determined by gravity investigations as well as through seismic profiles, it is of 14 km order. Since 1987, the collaboration between the IAG (the Institute of Astronomy and Geodesy) and the Royal Ohservatory of Belgium (ROB) allows gravity tides observations in three different points of the island. Two of them, Cueva de los Verdes y Jameos del Agua, at the norther part. The third one it is placed at the Park of Timanfaya, just over the anomalies mentioned above. In the present paper we deal with the results which can be related with the crustal structure, geotermic anomalies, ocean effects, etc.
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