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La búsqueda de evidencia de grandes terremotos prehistóricos a lo largo de la costa atlántica
Science (New York, N.Y.)
|February 8, 1991
Resumen
Los grandes terremotos prehistóricos (mb >/= 5.8) en la región costera del Atlántico en los últimos 5000 años parecen estar restringidos a Carolina del Sur. Se identificaron seis eventos de paleoliquefacción, cinco de los cuales se originaron cerca de Charleston.
Área de la Ciencia:
- Geología Geología Geología.
- Sismología Sismología Sismología.
- La paleosismología es la paleosismología.
Sus antecedentes:
- Las características de licuefacción inducida sísmicamente proporcionan evidencia de actividad sísmica pasada.
- Comprender la sismicidad histórica es crucial para la evaluación del riesgo sísmico.
Objetivo del estudio:
- Para investigar la distribución espacial y temporal de los grandes terremotos prehistóricos a lo largo de la costa atlántica.
- Identificar los orígenes y la frecuencia de eventos sísmicos significativos en la región.
Principales métodos:
- Análisis de las características de paleoliquefacción descubiertas a lo largo de la costa atlántica.
- La datación de la evidencia geológica para establecer una línea de tiempo para los terremotos prehistóricos.
Principales resultados:
- La evidencia de paleoliquefacción indica seis grandes terremotos prehistóricos (mb >/= 5.8 +/- 0.4) en los últimos 2000-5000 años.
- Estos eventos parecen estar restringidos espacialmente a Carolina del Sur, con al menos cinco originados cerca de Charleston.
- Grandes eventos sísmicos pueden haber ocurrido en esta región aproximadamente cada 500-600 años en los últimos dos milenios.
Conclusiones:
- Los grandes terremotos prehistóricos en la región costera del Atlántico durante los últimos 5000 años probablemente se limitaron a Carolina del Sur.
- El área de Charleston se identifica como una fuente significativa de la mayor actividad sísmica prehistórica.
- Los hallazgos contribuyen a comprender el comportamiento sísmico a largo plazo y el peligro en la región.
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