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El temblor volcánico y la histeresis de la altura del penacho del volcán Pavlof, Alaska
David Fee1, Matthew M Haney2, Robin S Matoza3
1Alaska Volcano Observatory, Wilson Alaska Technical Center, Geophysical Institute, University of Alaska Fairbanks, 903 Koyukuk Drive, Fairbanks, AK 99775, USA. dfee1@alaska.edu.
Science (New York, N.Y.)
|January 7, 2017
Resumen
La erupción del volcán Pavlof de 2016 mostró una relación cambiante entre el temblor sísmico y la altura del penacho de ceniza. Esto sugiere que la erosión de los respiraderos volcánicos afecta la intensidad y las emisiones de las erupciones, de manera similar a los sistemas fluviales.
Área de la Ciencia:
- La geofísica
- Volcanología
- Acústico
Sus antecedentes:
- La erupción del volcán Pavlof en marzo de 2016 generó cenizas significativas, lo que interrumpió el transporte aéreo en América del Norte.
- Los datos sísmicos e infrasónicos registraron un fuerte temblor volcánico durante la erupción.
Objetivo del estudio:
- Para investigar la relación entre las amplitudes de temblor y la altura del penacho volcánico.
- Explorar el papel de la erosión de los respiraderos volcánicos en la modulación de las señales geofísicas durante las erupciones.
Principales métodos:
- Análisis de datos sísmicos e infrasonidos del conjunto portátil EarthScope.
- Comparación de la amplitud del temblor y la altura del penacho durante las fases de crecimiento y disminución de la erupción.
Principales resultados:
- Se observó una relación variable entre la amplitud del temblor y la altura del penacho, exhibiendo histeresis.
- Esta histeresis sugiere cambios estructurales irreversibles en el respiradero volcánico, probablemente debido a la erosión.
Conclusiones:
- La erosión de los respiraderos volcánicos influye significativamente en la relación entre el temblor sísmico y la dinámica de la erupción.
- Comprender esta relación puede mejorar las estimaciones de emisión volcánica y la caracterización de la erupción.
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