Results 211 to 220 of about 7,833 (249)
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Volcano seismology, hazards assessment
Reviews of Geophysics, 1995The last few years have seen several impressive examples of seismic monitoring at volcanoes to provide warnings that have saved lives and property. Changes in the rates and character of volcanic earthquakes provided precursory signs to explosive eruptions of moderate size at Redoubt volcano (Alaska), Mount Unzen (Japan), Mount Spurr (Alaska), and ...
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4-D noise-based seismology at volcanoes: Ongoing efforts and perspectives
Journal of Volcanology and Geothermal Research, 2016Monitoring magma pressure buildup at depth and transport to surface is a key point for improving volcanic eruption prediction. Seismic waves, through their velocity dependence to stress perturbations, can provide crucial information on the temporal evolution of the mechanical properties of volcanic edifices.
Brenguier, F. +7 more
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Mt. Etna volcano: A seismological framework
2004Mount Etna is one of the most active and powerful basaltic volcanoes in the world, with an historical record of documented eruptions going back over 2000 years. It is located in eastern Sicily in a complex geodynamic framework, where major regional structural lineaments play a key role in the dynamic processes of the volcano [e.g., Bonaccorso et al ...
Domenico Patanè +4 more
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Linking Petrology and Seismology at an Active Volcano
Science, 2012 Subterranean Eruption Clues Volcano monitoring relies upon detecting changing physical conditions around an active source, such as increased seismicity or ground deformation; however, relating these behaviors to magmatic processes below ground remains challenging. The geochemical signatures of erupted magmatic crystals, including
Kate Saunders +3 more
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Polarization Analysis in the Discrete Wavelet Domain: An Application to Volcano Seismology
Bulletin of the Seismological Society of America, 2010Abstract We propose a method for analyzing the polarization of three-component digital recordings using the discrete wavelet transform (DWT). This method allows for the automatic detection and separation of seismic phases that have a coherent linear or elliptical polarization.
L. D'Auria +5 more
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Bulletin of Volcanology, 2004
This study summarizes the results of structural, geochemical and seismological surveys carried out at Nisyros volcano (Aegean Sea, Greece) during 1999–2001. Field mapping and mesostructural measurements at the summit caldera (Lakki plain) indicate that faults follow two main strikes: NE-SW and N-S.
CALIRO S +6 more
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This study summarizes the results of structural, geochemical and seismological surveys carried out at Nisyros volcano (Aegean Sea, Greece) during 1999–2001. Field mapping and mesostructural measurements at the summit caldera (Lakki plain) indicate that faults follow two main strikes: NE-SW and N-S.
CALIRO S +6 more
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Seismological constraints on the position of the fragmentation surfaces in the volcano conduit
Earth and Planetary Science Letters, 2008Abstract The durations of the pre-explosion low-frequency impulses of the broadband seismic records of 286 Vulcanian explosions of Volcan de Colima and 15 Vulcanian explosions of Popocatepetl volcano, Mexico were analyzed. These pre-explosion impulses are thought to be produced during the upward movement of fragmented magma in the volcano conduit ...
Vyacheslav M. Zobin +3 more
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Seismological aspects of the 1989–1990 eruptions at redoubt volcano, Alaska: the SSAM perspective
Journal of Volcanology and Geothermal Research, 1994Abstract SSAM is a simple and inexpensive tool for continuous monitoring of average seismic amplitudes within selected frequency bands in near real-time on a PC-based data acquisition system. During the 1989–1990 eruption sequence at Redoubt Volcano, the potential of SSAM to aid in rapid identification of precursory Long-Period (LP) event swarms was ...
Christopher D. Stephens +4 more
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Bulletin of Volcanology, 1991
We present results of study of the best-documented eruptions of Pavlof volcano in historic time. The 1986 eruptions were mostly Strombolian in character; a strong initial phase may have been Vulcanian. The 1986 activity erupted at least 8×106 m3 of feldspar-phyric basaltic andesite lava (SiO2=53–54%), and a comparable volume of wind-borne tephra ...
McNutt, Stephen R. +2 more
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We present results of study of the best-documented eruptions of Pavlof volcano in historic time. The 1986 eruptions were mostly Strombolian in character; a strong initial phase may have been Vulcanian. The 1986 activity erupted at least 8×106 m3 of feldspar-phyric basaltic andesite lava (SiO2=53–54%), and a comparable volume of wind-borne tephra ...
McNutt, Stephen R. +2 more
openaire +2 more sources