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In this paper we analyse the seismic record during the extrusion of a lava spine at Unzen volcano, Japan, in 1994. We find two strong groups of similar volcanic earthquakes which, combined with previously published field and experimental observations, we interpret as repetitive fracturing along the margin of the lava spine. This work demonstrates the potential of combining these different approaches for achieving a greater understanding of shallow volcanic processes.
Articles | Volume 6, issue 4
Solid Earth, 6, 1277–1293, 2015
https://doi.org/10.5194/se-6-1277-2015
Solid Earth, 6, 1277–1293, 2015
https://doi.org/10.5194/se-6-1277-2015

Research article 07 Dec 2015

Research article | 07 Dec 2015

Repetitive fracturing during spine extrusion at Unzen volcano, Japan

O. D. Lamb et al.

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Cited articles

Allen, R. V.: Automatic earthquake recognition and timing from single traces, B. Seismol. Soc. Am., 68, 1521–1532, 1978.
Bean, C. J., De Barros, L., Lokmer, I., Métaxian, J.-P., O'Brien, G., and Murphy, S.: Long-period seismicity in the shallow volcanic edifice formed from slow-rupture earthquakes, Nat. Geosci., 7, 71–75, https://doi.org/10.1038/ngeo2027, 2013.
Ben-Zion, Y. and Sammis, C. G.: Characterization of Fault Zones, Pure Appl. Geophys., 160, 677–715, https://doi.org/10.1007/PL00012554, 2003.
Buurman, H. and West, M. E.: Seismic precursors to volcanic explosions during the 2006 eruption of Augustine Volcano, in: The 2006 Eruption of Augustine Volcano, Alaska, U.S. Geological Survey Professional Paper 1769, edited by: Power, J. A., Coombs, M. L., and Freymueller, J. T., USGS, Reston, VA, USA, chap. 2, 41–57, 2010.
Byerlee, J.: Friction of rocks, Pure Appl. Geophys., 116, 615–626, https://doi.org/10.1007/BF00876528, 1978.
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Short summary
In this paper we analyse the seismic record during the extrusion of a lava spine at Unzen volcano, Japan, in 1994. We find two strong groups of similar volcanic earthquakes which, combined with previously published field and experimental observations, we interpret as repetitive fracturing along the margin of the lava spine. This work demonstrates the potential of combining these different approaches for achieving a greater understanding of shallow volcanic processes.
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