Mediciones geodésicas de largas distancias: aplicación al estudio del movimiento de placas en el Golfo de California

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Published: Jul 1, 1988
DOI: https://doi.org/10.22201/igeof.00167169p.1988.27.3.1205
Keywords:
Geodesy, measurements, distances, plate tectonics, Gulf of California

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P.H. Lesage
Institut de Physique du Globe de Paris, 4 Place Jussieu, 75252 Paris, Francia. Centro de Investigación Científica y de Educación Superior de Ensenada, Baja California, México ; Ahora en: Laboratoire d1nstrumentation Géophysique, Uníversité de Savoie, B. P. 1104, 13011 Chambéry, Cedex, Francia
M. Kasser
Institut de Physique du Globe de Paris, 4 Place Jussieu, 75252 Paris, Francia. Institut Géographique National, Saint Mandé, Francia
J. Pagarete
Institut de Physique du Globe de Paris, 4 Place Jussieu, 75252 Paris, Francia. Institut Géographique National, Saint Mandé, Francia. Faculdade de Ciencills da Universidade de Lisboa, Portugal
J. C. Ruegg
Institut de Physique du Globe de Paris, 4 Place Jussieu, 75252 Paris, Francia
L. Ortlieb
Institut Francais de Recherche Scienti[ique pour le Développement en Coopération (ORSTOM), Paris, Francia
J. Guerrero
Universidad Nacional Autónoma de México, Instituto de Geología, Ciudad Universitaria, Delegación Coyoacán, 04510, Mexico City, México
N. Duch
Dirección General de Geogra[fa del Territorio Nacional, México
J. Roldán
Universidad Nacional Autónoma de México, Instituto de Geología, Estación Regional del Noroeste, Hermosillo, Sonora, México
F. Castellanos
Dirección General de Geografía del Territorio Nacional, México
T. Montano
Universidad Nacional Autónoma de México, Instituto de Geología, Estación Regional del Noroeste, Hermosillo, Sonora, México
J. L. Rodríguez
Universidad Nacional Autónoma de México, Instituto de Geología, Estación Regional del Noroeste, Hermosillo, Sonora, México
T. Calmus
Departamento de Geologfa, Universidad de Sonora, Hermosillo, México

Abstract

The modern geodetic methodologies such as electro-optic distance measurements and spatial positioning systems have increasing applications in geophysics to study tectonic deformations and relative plate motions. In this paper we show a rapid comparison of these geodetic methods in terms of applicability and precision. We discuss the methods of electronic distance measurements and of data processing in the case of large distances (about 90 km). Using these technics, a geodetic network of 11 points and 150 km wide was measured in 1982 and 1986, across the Central Gulf of California. The comparison between 1982 and 1986 data allows us toestímate the relative displacements between Baja California and Sonora about 6- 8 cm/yr; this value is consistent with previous estimations of plate motion between the Pacific and North American plates. Between Angel de la Guarda Island and Baja California a right lateral displacement of about 17 cm is observed in the four-years ínterval. In the southwestern part of the network, around the Sal-si-puedes Channel, the deformation remains smaller than the estimated errors, suggesting a locked segment of the plate boundary, coincident with the present seismíe gap which is observed in this area. In the eastern part of the network, between the axial islands and the Son oran coast, significant right lateral shear deformations occur with a relative displacement rate of 6 ±3 cm/yr. These results show that the strain accumulation is distributed in a Iarge area around the plate boundary.

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How to Cite
Lesage, P., Kasser, M., Pagarete, J., Ruegg, J. C., Ortlieb, L., Guerrero, J., … Calmus, T. (1988). Mediciones geodésicas de largas distancias: aplicación al estudio del movimiento de placas en el Golfo de California. Geofisica Internacional, 27(3), 351–377. https://doi.org/10.22201/igeof.00167169p.1988.27.3.1205
Issue
Vol. 27 No. 3 (1988): July 1, 1988
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Article
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This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

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