cooperation project for the development of regional magnetic models
and charts in Mexico and Costa Rica
Ana Caccavari-Garza1, Gerardo Cifuentes-Nava1, Esteban
Hernández-Quintero1, Jorge Brenes2, Armando
Geofísica, Universidad Nacional Autónoma de México, México (2)
Instituto Costarricense de Electricidad, Costa Rica
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