New data on the deep structure of the Northern Vent of the Great Tolbachik Fissure Eruption (1975-1976)

Kugaenko, Yu.; Saltykov, V.; Gorbatikov, A.; Stepanova, M.; Abkadyrov, I.
December 2011
Doklady Earth Sciences;Dec2011, Vol. 441 Issue 2, p1673
Academic Journal
In order to restore the deep structure in the region of the Northern Vent (NV) of the Great Tolbachik Fissure Eruption (GTFE) (1975-1976), low-frequency microseismic sounding was applied. For this purpose accumulation of spectra of the microseismic field was performed in a wide frequency band in 29 points along a linear profile 14 km in length embedded transversely to the fissure eruption. A deep cross section of the Earth's crust was constructed up to 20 km, reflecting the distribution of relative velocities of transverse seismic waves. The revealed structural heterogeneities were interpreted with consideration of previously known results of complex studies of the eruption. The existence of an abnormal structure at the depths of 2-3 and 7-8 km under the NV GTFE was confirmed, which could be low-depth magma chambers. Deep subvertical low-velocity structures were revealed and spatially registered, which probably feed the conduits of the eruption. It was demonstrated that the ways of possible magma supply to the peripheral chamber at the depth of 2-3 km could be various. For the first time for the zone of areal volcanism, variation of the character of magmatic intrusions was demonstrated at the transition from a crystalline basement to the near-surface depth: subvertical forms are replaced with a system of sills and interesting injections.


Related Articles

  • Dynamics of seismogenic volcanic extrusion at Mount St Helens in 2004–05. Iverson, Richard M.; Dzurisin, Daniel; Gardner, Cynthia A.; Gerlach, Terrence M.; LaHusen, Richard G.; Lisowski, Michael; Major, Jon J.; Malone, Stephen D.; Messerich, James A.; Moran, Seth C.; Pallister, John S.; Qamar, Anthony I.; Schilling, Steven P.; Vallance, James W. // Nature;11/23/2006, Vol. 444 Issue 7118, p439 

    The 2004–05 eruption of Mount St Helens exhibited sustained, near-equilibrium behaviour characterized by relatively steady extrusion of a solid dacite plug and nearly periodic shallow earthquakes. Here we present a diverse data set to support our hypothesis that these earthquakes resulted...

  • Rapid ascent of rhyolitic magma at Chaitén volcano, Chile. Castro, Jonathan M.; Dingwell, Donald B. // Nature;10/8/2009, Vol. 461 Issue 7265, p780 

    Rhyolite magma has fuelled some of the Earth’s largest explosive volcanic eruptions. Our understanding of these events is incomplete, however, owing to the previous lack of directly observed eruptions. Chaitén volcano, in Chile’s northern Patagonia, erupted rhyolite magma...

  • Evolution of silicic magmas in the Kos-Nisyros volcanic center, Greece: a petrological cycle associated with caldera collapse. Bachmann, Olivier; Deering, Chad; Ruprecht, Janina; Huber, Christian; Skopelitis, Alexandra; Schnyder, Cedric // Contributions to Mineralogy & Petrology;Jan2012, Vol. 163 Issue 1, p151 

    Multiple eruptions of silicic magma (dacite and rhyolites) occurred over the last ~3 My in the Kos-Nisyros volcanic center (eastern Aegean sea). During this period, magmas have changed from hornblende-biotite-rich units with low eruption temperatures (≤750-800°C; Kefalos and Kos dacites...

  • Seismicity and magma supply rate of the 1998 failed eruption at Iwate volcano, Japan. Nishimura, Takeshi; Ueki, Sadato // Bulletin of Volcanology;Mar2011, Vol. 73 Issue 2, p133 

    Iwate volcano, Japan, showed significant volcanic activity including earthquake swarms and volcano inflation from the beginning of 1998. A large earthquake of magnitude 6.1 hit the south-west of the volcano on September 3. Although a 1 km fumarole field formed, blighting plants on the ridge in...

  • Experimental constraints on permeable gas transport in crystalline silicic magmas. Okumura, Satoshi; Nakamura, Michihiko; Nakano, Tsukasa; Uesugi, Kentaro; Tsuchiyama, Akira // Contributions to Mineralogy & Petrology;Sep2012, Vol. 164 Issue 3, p493 

    The gas and fluid transport in magmas via permeable flow through interconnected bubble networks controls the rate of outgassing from magmas ascending in volcanic conduits and the fluid transport in the mushy boundary layer of magma reservoirs. Hence, clarifying its mechanism and rate is crucial...

  • Explosive Eruption of Volcanoes: Some Approaches to Simulation. Kedrinskii, V.; Makarov, A.; Stebnovskii, S.; Takayama, K. // Combustion, Explosion, & Shock Waves;Nov2005, Vol. 41 Issue 6, p777 

    This paper gives results from experimental studies of the structure dynamics of liquid samples with viscosity in the range 0.001–2.6 Pa⋅sec during their breakdown as a result of dynamic decompression. Studies of the breakdown of liquid mixtures and liquids saturated with carbon...

  • Volcano Seismology. Chouet, Bernard // Pure & Applied Geophysics;Mar2003, Vol. 160 Issue 3/4, p739 

    — A fundamental goal of volcano seismology is to understand active magmatic systems, to characterize the configuration of such systems, and to determine the extent and evolution of source regions of magmatic energy. Such understanding is critical to our assessment of eruptive behavior and...

  • The peripheral magma chamber of Ploskii Tolbachik, a Kamchatka basaltic volcano: Activity, location and depth, dimensions, and their changes based on magma discharge observations. Fedotov, S.; Utkin, I.; Utkina, L. // Journal of Volcanology & Seismology;Dec2011, Vol. 5 Issue 6, p369 

    The Klyuchevskoi group of volcanoes (KGV) in Kamchatka is the most powerful existing island arc and subduction zone volcanic center. The Holocene volcanic activity in the southern part of the KGV is concentrated in a large basaltic volcano, Ploskii Tolbachik (PT), altitude 3085 m and in its...

  • A multi-sill magma plumbing system beneath the axis of the East Pacific Rise. Marjanović, Milena; Carbotte, Suzanne M.; Carton, Helene; Nedimović, Mladen R.; Mutter, John C.; Canales, Juan Pablo // Nature Geoscience;Nov2014, Vol. 7 Issue 11, p825 

    Upper oceanic crust at fast- to intermediate-spreading mid-ocean ridges is thought to form from the intrusion and eruption of magma accumulated within a mid-crustal reservoir present beneath the ridge axis. However, the mechanisms for formation of the lower crust are debated. Observations from...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics