Accelerating Precursory Activity within a Class of Earthquake Analogue Automata

2004 ◽  
pp. 2005-2019 ◽  
Author(s):  
Dion Weatherley ◽  
Peter Mora
Keyword(s):  
Precursory Activity

Precursory activity of the 161 ka Kos Plateau Tuff eruption, Aegean Sea (Greece)

2010 ◽  
Vol 72 (6) ◽  
pp. 657-669 ◽  
Author(s):  
David J. W. Piper ◽  
Georgia Pe-Piper ◽  
Darren Lefort
Keyword(s):  
Aegean Sea ◽  
Precursory Activity

scholarly journals Integrating field, textural, and geochemical monitoring to track eruption triggers and dynamics: a case study from Piton de la Fournaise

Solid Earth ◽  
2018 ◽  
Vol 9 (2) ◽  
pp. 431-455 ◽  
Author(s):  
Lucia Gurioli ◽  
Andrea Di Muro ◽  
Ivan Vlastélic ◽  
Séverine Moune ◽  
Simon Thivet ◽  
...  
Keyword(s):  
Storage System ◽  
Storage Conditions ◽  
Magma Ascent ◽  
Magma Source ◽  
Piton De La Fournaise ◽  
Melt Separation ◽  
2014 Eruption ◽  
Volatile Exsolution ◽  
Precursory Activity

Abstract. The 2014 eruption at Piton de la Fournaise (PdF), La Réunion, which occurred after 41 months of quiescence, began with surprisingly little precursory activity and was one of the smallest so far observed at PdF in terms of duration (less than 2 days) and volume (less than 0.4  ×  106 m3). The pyroclastic material was composed of golden basaltic pumice along with fluidal, spiny iridescent and spiny opaque basaltic scoria. Density analyses performed on 200 lapilli reveal that while the spiny opaque clasts are the densest (1600 kg m−3) and most crystalline (55 vol. %), the golden pumices are the least dense (400 kg m−3) and crystalline (8 vol. %). The connectivity data indicate that the fluidal and golden (Hawaiian-like) clasts have more isolated vesicles (up to 40 vol. %) than the spiny (Strombolian-like) clasts (0–5 vol. %). These textural variations are linked to primary pre-eruptive magma storage conditions. The golden and fluidal fragments track the hotter portion of the melt, in contrast to the spiny fragments and lava that mirror the cooler portion of the shallow reservoir. Exponential decay of the magma ascent and output rates through time revealed depressurization of the source during which a stratified storage system was progressively tapped. Increasing syn-eruptive degassing and melt–gas decoupling led to a decrease in the explosive intensity from early fountaining to Strombolian activity. The geochemical results confirm the absence of new input of hot magma into the 2014 reservoir and confirm the emission of a single shallow, differentiated magma source, possibly related to residual magma from the November 2009 eruption. Fast volatile exsolution and crystal–melt separation (second boiling) were triggered by deep pre-eruptive magma transfer and stress field change. Our study highlights the possibility that shallow magma pockets can be quickly reactivated by deep processes without mass or energy (heat) transfer and produce hazardous eruptions with only short-term elusive precursors.

scholarly journals Deformations and Morphology Changes Associated with the 2016–2017 Eruption Sequence at Bezymianny Volcano, Kamchatka

2019 ◽  
Vol 11 (11) ◽  
pp. 1278 ◽  
Author(s):  
René Mania ◽  
Thomas R. Walter ◽  
Marina Belousova ◽  
Alexander Belousov ◽  
Sergey L. Senyukov
Keyword(s):  
Source Region ◽  
Integrated Approach ◽  
Close Monitoring ◽  
Density Currents ◽  
Bezymianny Volcano ◽  
Magma Supply ◽  
Data Resolution ◽  
Magmatic Intrusions ◽  
Precursory Activity ◽  
Magma Supply Rate

Lava domes grow by extrusions and intrusions of viscous magma often initiating from a central volcanic vent, and they are frequently defining the source region of hazardous explosive eruptions and pyroclastic density currents. Thus, close monitoring of dome building processes is crucial, but often limited to low data resolution, hazardous access, and poor visibility. Here, we investigated the 2016–2017 eruptive sequence of the dome building Bezymianny volcano, Kamchatka, with spot-mode TerraSAR-X acquisitions, and complement the analysis with webcam imagery and seismic data. Our results reveal clear morphometric changes preceding eruptions that are associated with intrusions and extrusions. Pixel offset measurements show >7 months of precursory plug extrusion, being locally defined and exceeding 30 m of deformation, chiefly without detected seismicity. After a short explosion, three months of lava dome evolution were characterised by extrusions and intrusion. Our data suggest that the growth mechanisms were significantly governed by magma supply rate and shallow upper conduit solidification that deflected magmatic intrusions into the uppermost parts of the dome. The integrated approach contributes significantly to a better understanding of precursory activity and complex growth interactions at dome building volcanoes, and shows that intrusive and extrusive growth is acting in chorus at Bezymianny volcano.

scholarly journals Integrating field, textural and geochemical monitoring to track eruption triggers and dynamics: a case-study from Piton de la Fournaise

2017 ◽  
Author(s):  
Lucia Gurioli ◽  
Andrea Di Muro ◽  
Ivan Vlastélic ◽  
Séverine Moune ◽  
Nicolas Villeneuve ◽  
...  
Keyword(s):  
Storage Conditions ◽  
Magma Source ◽  
Magma Storage ◽  
Strombolian Activity ◽  
Piton De La Fournaise ◽  
Residual Magma ◽  
2014 Eruption ◽  
Precursory Activity ◽  
Magma Storage Conditions

Abstract. The 2014 eruption at Piton de La Fournaise (PdF), la Reunion, which occurred after 41 months of quiescence, began with surprisingly little precursory activity, and was one of the smallest so far observed at PdF in terms of duration (less than 2 days) and volume (less than 0.4 Mm3). The pyroclastic material was composed of spiny-opaque, spiny-iridescent, and fluidal scoria along with golden pumice. Density analyses performed on 200 lapilli reveal that the spiny-opaque clasts are the densest (1600 kg/m3) and richest in crystals (54 vol%), and the golden pumices are the lightest (400 kg/m3) and poorest in crystals (14 vol%). The connectivity data indicate that the fluidal and golden (Hawaiian-like) clasts have more isolated vesicles (up to 40 %) than the spiny (Strombolian-like) clasts (0–5 %). These textural variations are linked to primary pre-eruptive magma storage conditions. The golden and fluidal fragments track the hotter portion of the melt, in contrast to the spiny fragments which mirror the cooler portion of the shallow reservoir. Progressive tapping of these distinct portions leads to a decrease in the explosive intensity from early fountaining to Strombolian activity. The geochemical results confirm the absence of new hot input of magma and confirm the involvement of a single, shallow, differentiated magma source, possibly related to residual magma from the November 2009 eruption. We found that the eruption was triggered by water exsolution, favoured by the shallow depth of the reservoir, rather than cooling and chemical evolution of the stored magma.

scholarly journals Precursory activity and evolution of the 2011 eruption of Shinmoe-dake in Kirishima volcano—insights from ash samples

2013 ◽  
Vol 65 (6) ◽  
pp. 591-607 ◽  
Author(s):  
Yuki Suzuki ◽  
Masashi Nagai ◽  
Fukashi Maeno ◽  
Atsushi Yasuda ◽  
Natsumi Hokanishi ◽  
...  
Keyword(s):  
Kirishima Volcano ◽  
Precursory Activity

scholarly journals Effectiveness of electromagnetic monitoring in studying earthquakes

2021 ◽  
Vol 43 (2) ◽  
pp. 166-177
Author(s):  
R.H. Piriyev
Keyword(s):  
Monitoring System ◽  
Significant Role ◽  
Earthquake Precursors ◽  
Young Researcher ◽  
Loma Prieta Earthquake ◽  
Electromagnetic Monitoring ◽  
Precursory Activity ◽  
Electromagnetic Precursors ◽  
Large Earthquakes ◽  
Obvious Feature

Numerous researches conducted in connection with the study of earthquakes have shown that electromagnetic monitoring studies have led to some important results. From the Loma Prieta earthquake to the Guam earthquake, electromagnetic monitoring studies led to significant results. Since then, there have been numerous reports of possible elect-romagnetic precursors to earthquakes, some of which have involved frequencies covered by ELF/VLF (10—32 kHz) monitoring system Fraser-Smith et al. [1990]. Sometime later, they retrieved and started processing their ULF data. They had less reason to expect electromagnetic precursors in this latter data, because previous reports of precursory signals at frequencies below the ELF/VLF range have, with few exceptions, involved frequencies either below or predominantly below their ULF range (0.01—10 Hz) of operation. They found out that ELF/VLF data do not appear to show precursory activity, whereas ULF data contain a number of anomalous features that may prove to be earthquake precursors. The lack of observation of precursory ELF/VLF noise so close to the epicenters of several mode-rate to moderately-large earthquakes showed that ELF/VLF noise need not be a strong or obvious feature of every earthquake, as Fraser-Smith et al. [1990] reported in their paper. At present, numerous studies have been conducted in this area and researches are being improved. From my experience as a young researcher, it became clear that electromagnetic monitoring research is necessary, and that more important and significant results can be achieved if continuous research is conducted in a certain area. Thus, these studies may play a significant role in the detection of earthquake precursors.

scholarly journals Underlying mechanism of precursory activity from analysis of upward earthquake migration

2011 ◽  
Vol 11 (1) ◽  
pp. 135-143 ◽  
Author(s):  
O. A. Molchanov
Keyword(s):  
Subduction Zones ◽  
Characteristic Temperature ◽  
Underlying Mechanism ◽  
Earthquake Triggering ◽  
Seismic Precursors ◽  
Upward Migration ◽  
The Pacific ◽  
Shallow Earthquakes ◽  
Earthquake Migration ◽  
Precursory Activity

Abstract. In this paper we analyse the upward earthquake hypocentral migration in the ten known subduction zones and discuss a possible mechanism of such migration. The total time of the migration appears to range from 2.5 to 10 years. It leads to the estimation of the average velocity Vz~ 60−300 km yr−1. It probably corresponds to the movement of the forcing agent like stress or deformation wave from depths of the upper mantle (600–700 km) to the level of the lithosphere with subsequent initiation of fluid migration inside the crust to trigger shallow earthquakes. Averaged over all zones upward migration travel time is about 5 years (< Vz > ≈120 km yr−1) that coincides approximately with the period of characteristic temperature variation (El Nino) and crustal seismic periodicity in the Pacific region. These findings are helpful for the study of the seismic precursors and analysis of earthquake triggering.

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