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Rápida acumulación de tensión intraplaquetaria en la nueva zona sísmica de Madrid
Science (New York, N.Y.)
|September 18, 1992
Resumen
La rápida acumulación de tensión de la corteza terrestre detectada en la zona sísmica de Nuevo Madrid sugiere un mayor riesgo de futuros terremotos intraplacas. Este hallazgo es crucial para la evaluación del peligro sísmico en regiones sísmicamente activas.
Área de la Ciencia:
- La geofísica es la geofísica.
- Sismología Sismología Sismología.
- La geodesia es una técnica de geodesia.
Sus antecedentes:
- La zona sísmica de Nueva Madrid (NMSZ) es conocida por su significativa sismicidad histórica, incluidos tres terremotos importantes en 1811-1812.
- Las zonas sísmicas intraplacas plantean desafíos únicos para la evaluación de peligros debido a los grandes eventos poco frecuentes.
Objetivo del estudio:
- Para evaluar la acumulación actual de cepas de la corteza en el sur de la NMSZ.
- Evaluar el potencial de futuros terremotos intraplacas dañinos en la región.
Principales métodos:
- Remeasurement de una red de triangulación histórica utilizando el Sistema de Posicionamiento Global (GPS).
- Análisis de datos geodésicos para detectar patrones de deformación de la corteza.
Principales resultados:
- Se ha observado una acumulación significativa y rápida de cepas de la corteza desde la década de 1950.
- La tensión observada es consistente con el movimiento de deslizamiento lateral derecho a lo largo de una falla de tendencia noreste.
- Los patrones actuales de sismicidad se alinean con la orientación inferida de la falla.
Conclusiones:
- La detección de deformaciones de la corteza terrestre es una herramienta valiosa para identificar áreas en riesgo de futuros terremotos intraplacas.
- La NMSZ exhibe una deformación en curso que es indicativa de riesgos sísmicos potenciales, incluso sin terremotos históricos recientes.
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