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Temblores no volcánicos en las profundidades debajo de la Falla de San Andrés

Robert M Nadeau¹, David Dolenc

¹Berkeley Seismological Laboratory, 211 McCone Hall, University of California, Berkeley, CA 94720-4760, USA. nadeau@seismo.berkeley.edu

Science (New York, N.Y.)

|December 14, 2004

Resumen

Los científicos encontraron actividad de temblores no volcánicos en las profundidades de la falla de San Andrés de California. Esta señal sísmica, que ocurre por debajo de la zona generadora de terremotos, puede estar correlacionada con los patrones de terremotos locales.

Área de la Ciencia:

* Sismología y Tectonofísica: Investiga los fenómenos sísmicos y la dinámica de los límites de las placas.

Sus antecedentes:

* La Falla de San Andrés es un importante límite de placa de transformación en California, asociado con eventos sísmicos significativos como el terremoto de Fort Tejon de 1857.
* Se entiende que la actividad sísmica, incluidos los terremotos, se origina principalmente dentro de la zona sísmica de la corteza terrestre.

Objetivo del estudio:

* Identificar y caracterizar la actividad de temblores no volcánicos a lo largo de la Falla de San Andrés.
* Para determinar la profundidad y la relación potencial de este temblor con la sismicidad local.

Principales métodos:

* Análisis de datos sísmicos para detectar señales sísmicas de larga duración que carecen de ondas P o S claras (tremor no volcánico).
* Geolocalización de la actividad de temblores dentro de la zona límite de la placa de transformación.

Principales resultados:

* Descubrimiento de actividad de temblores no volcánicos a profundidades de 20 a 40 kilómetros.
* Este temblor ocurre por debajo de la zona sísmica típica (superior ~15 km).
* Se observó una correlación potencial entre las tasas de actividad de temblores y las variaciones en la actividad sísmica local.

Conclusiones:

* El temblor no volcánico está presente muy debajo de la Falla de San Andrés, por debajo de la zona sísmica.
* Esta actividad sísmica profunda puede desempeñar un papel en el comportamiento sísmico más amplio del sistema de fallas.

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