globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2027
论文题名:
Long-period seismicity in the shallow volcanic edifice formed from slow-rupture earthquakes
作者: Bean C.J.; De Barros L.; Lokmer I.; Métaxian J.-P.; O'Brien G.; Murphy S.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2014
卷: 7, 期:1
起始页码: 71
结束页码: 75
语种: 英语
英文摘要: Forecasting of volcanic eruptions is still inadequate, despite technological advances in volcano monitoring. Improved forecasting requires a deeper understanding of when unrest will lead to an actual eruption. Shallow, long-period seismic events often precede volcanic eruptions and are used in forecasting. They are thought to be generated by resonance in fluid-filled cracks or conduits, indicating the presence of near-surface magmatic fluids. Here we analyse very-high-resolution seismic data from three active volcanoes-Mount Etna in Italy, Turrialba Volcano in Costa Rica and Ubinas Volcano in Peru-measured between 2004 and 2009. We find that seismic resonance is dependent on the wave propagation path and that the sources for the long-period seismic waves are composed of short pulses. We use a numerical model to show that slow-rupture failure in unconsolidated volcanic materials can reproduce all key aspects of these observations. Therefore, contrary to current interpretations, we suggest that short-duration long-period events are not direct indicators of fluid presence and migration, but rather are markers of deformation in the upper volcanic edifice. We suggest that long-period volcano seismicity forms part of the spectrum between slow-slip earthquakes and fast dynamic rupture, as has been observed in non-volcanic environments. © 2014 Macmillan Publishers Limited.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106436
Appears in Collections:气候减缓与适应
科学计划与规划

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作者单位: Seismology Laboratory, School of Geological Sciences, University College Dublin, Belfield-Dublin-4, Ireland; IRD, CNRS, Université de Savoie, F-73376 Le Bourget du Lac, France; Geophysical Technology Group, Tullow Oil Plc, Leopardstown-Dublin-18, Ireland; Geophysics Research Group, Environmental Sciences Research Institute, University of Ulster, Coleraine BT52 1SA, United Kingdom; Université de Nice Sophia-Antipolis, CNRS, Observatoire de la Côte d'Azur, 250 rue Albert Einstein, Sophia Antipolis 06560, Valbonne, France

Recommended Citation:
Bean C.J.,De Barros L.,Lokmer I.,et al. Long-period seismicity in the shallow volcanic edifice formed from slow-rupture earthquakes[J]. Nature Geoscience,2014-01-01,7(1)
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