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Binational cooperation project for the development of regional magnetic models and charts in Mexico and Costa Rica |
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Ana Caccavari-Garza1, Gerardo Cifuentes-Nava1, Esteban Hernández-Quintero1, Jorge Brenes2, Armando Ayala2. |
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(1)Instituto de Geofísica, Universidad Nacional Autónoma de México, México (2) Instituto Costarricense de Electricidad, Costa Rica |
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Historically, Mexico and Costa Rica are countries that have studied the Geomagnetic field in the region since the end of the 19th century, providing valuable information for the study of the Earth's magnetic field and its variations, both regionally and globally. In Costa Rica, systematic observations of the magnetic field begin between 1898 and 1901 by Henri Pittier, who carried out measures of declination and horizontal component, publishing the first isogonic chart. There are magnetic declination data obtained in engineering works in Guatemala, El Salvador, Honduras, Nicaragua and Costa Rica (1891-1983). In 1965, Gutiérrez Braun published a updated isogonic and in 1978 G. Leandro and J. Páez make the most detailed study of the magnetic field of Costa Rica, obtaining the magnetic chart for 1978 that was updated later by G. Leandro in 1984. In Mexico, the first magnetic observations were made at the end of the 16th century by Cavendish in 1576 in La Paz, B.C and the first Magnetic chart was published by the Carnegie Institute in Washington in 1906. In the year of 1947, was founded the IGEF (Institute of Geophysics of the UNAM) and was commissioned to publish the Magnetic Charts for the Mexican Republic. The last published Magnetic Chart corresponds to the Epoch 2010.0, constituted by 52 Magnetic Stations of Repetition. There are also a couple of catalogs published by the Institute of Geophysics of the National Autonomous University of Mexico, where we can find all the magnetic values of the Mexican Republic and Central America of 1587-1991. These studies have been interrupted in recent years due to problems of lack of logistical and financial support; as well as the operation of the Chiripa Magnetic Observatory, Costa Rica, which has being reinstalled in a new zone and started working again this year. In this project we takes up these important studies and we work together to occupy a number adequate repeating magnetic stations in the area (Costa Rica and Mexico), with two purposes principal: update data for regional geomagnetic field models (Southeast of Mexico and Central America); as well as the exchange of techniques for measurement, processing, and publication of the results in the corresponding catalogs that incorporate magnetic cartography in maps. Collaboration with other countries in this type of project is extremely important for the solution of problems common, and continue with the generation of regional knowledge, which also contributes to the study of the Earth's magnetic field in a global way and supports new applications such as risk volcanic. We present the Declination, Inclination and Intensity charts obtained in different stages of the project as well as the methodology followed to standardize a protocol of measurements and data processing in both countries. |
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Measurements |
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poster |
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