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Magma migration at the onset of the 2012-13 Tolbachik eruption revealed by Seismic Amplitude Ratio Analysis

Author
Organization
Abstract
In contrast of the 1975-76 Tolbachik eruption, the 2012-13 Tolbachik eruption was not preceded by any striking change in seismic activity. By processing the Klyuchevskoy volcano group seismic data with the Seismic Amplitude Ratio Analysis (SARA) method, we gain insights into the dynamics of magma movement prior to this important eruption. A clear seismic migration within the seismic swarm, started 20 hours before the reported eruption onset (05:15 UTC, 26 November 2012). This migration proceeded in different phases and ended when eruptive tremor, corresponding to lava flows, was recorded (at similar to 11:00 UTC, 27 November 2012). In order to get a first order approximation of the magma location, we compare the calculated seismic intensity ratios with the theoretical ones. As expected, the observations suggest that the seismicity migrated toward the eruption location. However, we explain the pre-eruptive observed ratios by a vertical migration under the northern slope of Plosky Tolbachik volcano followed by a lateral migration toward the eruptive vents. Another migration is also captured by this technique and coincides with a seismic swarm that started 16-20 km to the south of Plosky Tolbachik at 20:31 UTC on November 28 and lasted for more than 2 days. This seismic swarm is very similar to the seismicity preceding the 1975-76 Tolbachik eruption and can be considered as a possible aborted eruption.
Keywords
The 2012-13 Tolbachik eruption, Monitoring, Magma migration, Seismic Amplitude Ratio Analysis, Fissure eruption, EARTHQUAKE, KAMCHATKA, LOCATION, VOLCANO

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MLA
Caudron, Corentin et al. “Magma Migration at the Onset of the 2012-13 Tolbachik Eruption Revealed by Seismic Amplitude Ratio Analysis.” JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH 307 (2015): 60–67. Print.
APA
Caudron, C., Taisne, B., Kugaenko, Y., & Saltykov, V. (2015). Magma migration at the onset of the 2012-13 Tolbachik eruption revealed by Seismic Amplitude Ratio Analysis. JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH, 307, 60–67.
Chicago author-date
Caudron, Corentin, Benoit Taisne, Yulia Kugaenko, and Vadim Saltykov. 2015. “Magma Migration at the Onset of the 2012-13 Tolbachik Eruption Revealed by Seismic Amplitude Ratio Analysis.” Journal of Volcanology and Geothermal Research 307: 60–67.
Chicago author-date (all authors)
Caudron, Corentin, Benoit Taisne, Yulia Kugaenko, and Vadim Saltykov. 2015. “Magma Migration at the Onset of the 2012-13 Tolbachik Eruption Revealed by Seismic Amplitude Ratio Analysis.” Journal of Volcanology and Geothermal Research 307: 60–67.
Vancouver
1.
Caudron C, Taisne B, Kugaenko Y, Saltykov V. Magma migration at the onset of the 2012-13 Tolbachik eruption revealed by Seismic Amplitude Ratio Analysis. JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH. 2015;307:60–7.
IEEE
[1]
C. Caudron, B. Taisne, Y. Kugaenko, and V. Saltykov, “Magma migration at the onset of the 2012-13 Tolbachik eruption revealed by Seismic Amplitude Ratio Analysis,” JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH, vol. 307, pp. 60–67, 2015.
@article{8541403,
  abstract     = {In contrast of the 1975-76 Tolbachik eruption, the 2012-13 Tolbachik eruption was not preceded by any striking change in seismic activity. By processing the Klyuchevskoy volcano group seismic data with the Seismic Amplitude Ratio Analysis (SARA) method, we gain insights into the dynamics of magma movement prior to this important eruption. A clear seismic migration within the seismic swarm, started 20 hours before the reported eruption onset (05:15 UTC, 26 November 2012). This migration proceeded in different phases and ended when eruptive tremor, corresponding to lava flows, was recorded (at similar to 11:00 UTC, 27 November 2012). In order to get a first order approximation of the magma location, we compare the calculated seismic intensity ratios with the theoretical ones. As expected, the observations suggest that the seismicity migrated toward the eruption location. However, we explain the pre-eruptive observed ratios by a vertical migration under the northern slope of Plosky Tolbachik volcano followed by a lateral migration toward the eruptive vents. Another migration is also captured by this technique and coincides with a seismic swarm that started 16-20 km to the south of Plosky Tolbachik at 20:31 UTC on November 28 and lasted for more than 2 days. This seismic swarm is very similar to the seismicity preceding the 1975-76 Tolbachik eruption and can be considered as a possible aborted eruption.},
  author       = {Caudron, Corentin and Taisne, Benoit and Kugaenko, Yulia and Saltykov, Vadim},
  issn         = {0377-0273},
  journal      = {JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH},
  keywords     = {The 2012-13 Tolbachik eruption,Monitoring,Magma migration,Seismic Amplitude Ratio Analysis,Fissure eruption,EARTHQUAKE,KAMCHATKA,LOCATION,VOLCANO},
  language     = {eng},
  pages        = {60--67},
  title        = {Magma migration at the onset of the 2012-13 Tolbachik eruption revealed by Seismic Amplitude Ratio Analysis},
  url          = {http://dx.doi.org/10.1016/j.jvolgeores.2015.09.010},
  volume       = {307},
  year         = {2015},
}

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