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Un nuevo modo global de deformación de la Tierra: se detecta el ciclo estacional
G Blewitt1, D Lavallée, P Clarke
1Nevada Bureau of Mines and Geology, and Seismological Laboratory, University of Nevada, Reno, NV 89557, USA. gblewitt@unr.edu
Resumen
La Tierra La Tierra La Tierra La Tierra La Tierra
Área de la Ciencia:
- La geofísica es la geofísica.
- Geofísica de la Tierra sólida Geofísica de la Tierra sólida
- La geodesia es una técnica de geodesia.
Sus antecedentes:
- La deformación de la Tierra está influenciada por la redistribución estacional de la masa.
- Los modelos teóricos predicen los patrones de deformación global.
- Los datos del Sistema de Posicionamiento Global (GPS) ofrecen mediciones geodésicas precisas.
Objetivo del estudio:
- Detectar y caracterizar un modo global de deformación de la Tierra.
- Para validar las predicciones teóricas de la respuesta elástica de la Tierra a la carga superficial.
- Para cuantificar el intercambio de masa estacional interhemisférico.
Principales métodos:
- Utilizó datos de posicionamiento precisos de una red global de sitios del Sistema de Posicionamiento Global (GPS).
- Se analizaron las variaciones estacionales en los patrones de deformación entre febrero-marzo y agosto-septiembre.
- Aplicó técnicas de inversión de datos para determinar los momentos de carga y el intercambio de masa.
Principales resultados:
- Se detectó un patrón de deformación global de grado uno consistente con las predicciones teóricas.
- Observó la compresión del hemisferio norte y la expansión del hemisferio sur durante el invierno.
- Intercambio de masa interhemisférico significativo cuantificado, que alcanza su punto máximo en el invierno del hemisferio norte.
Conclusiones:
- El modo de deformación detectado representa la respuesta elástica de la Tierra sólida a la carga estacional de masa de la superficie.
- La carga estacional de la humedad del suelo, la nieve y la atmósfera impulsa una significativa deformación global de la Tierra.
- Los hallazgos confirman la redistribución de masa cíclica a gran escala entre los hemisferios de la Tierra.
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