Explosion dynamics from strainmeter and microbarometer observations, Soufriere Hills Volcano, Montserrat: 2008-2009

被引：19

作者：

Chardot, L. ^{[1
,2
]}

Voight, B. ^{[3
]}

Foroozan, R. ^{[3
]}

Sacks, S. ^{[4
]}

Linde, A. ^{[4
]}

Stewart, R. ^{[1
]}

Hidayat, D. ^{[3
,5
]}

Clarke, A. ^{[6
]}

Elsworth, D. ^{[3
]}

Fournier, N. ^{[1
]}

Komorowski, J. -C. ^{[1
,7
]}

Mattioli, G. ^{[8
]}

Sparks, R. S. J. ^{[9
]}

Widiwijayanti, C. ^{[5
]}

机构：

[1] Montserrat Volcano Observ, Flemmings, Montserrat

[2] Ecole & Observ Sci Terre, F-67084 Strasbourg, France

[3] Penn State Univ, University Pk, PA 16802 USA

[4] Carnegie Inst Sci, Dept Terr Magnetism, Washington, DC 20015 USA

[5] Earth Observ Singapore, Singapore 639798, Singapore

[6] Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA

[7] Inst Phys Globe Strasbourg, F-75252 Paris 05, France

[8] Univ Arkansas, Dept Geosci, Fayetteville, AR 72701 USA

[9] Univ Bristol, Dept Earth Sci, Bristol BS8 1RJ, Avon, England

来源：

GEOPHYSICAL RESEARCH LETTERS | 2010年 / 37卷

关键词：

DEFORMATION;

D O I：

10.1029/2010GL044661

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Vulcanian explosions with plumes to 12 km occurred at Soufriere Hills volcano (SHV) between July 2008 and January 2009. We report strainmeter and barometric data, featuring quasi-linear strain changes that correlate with explosive evacuation of the conduit at rates of similar to 0.9-2 x 10(7) kg s(-1). July and January explosion-generated strains were similar, similar to 20 nanostrain at similar to 5 km, and interpreted as contractions of a quasi-cylindrical conduit, with release of magmastatic pressure, and exsolution-generated overpressure of order 10 MPa. The 3 December 2008 event was distinctive with larger signals (similar to 140-200 nanostrain at 5-6 km) indicating that a rapid pressurization preceded and triggered the explosion. Modeling suggests a dike with ENE trend, implying that feeder dikes at SHV had diverse attitudes at different times during the eruption. All explosions were associated with acoustic pulses and remarkable atmospheric gravity waves. Citation: Chardot, L., et al. (2010), Explosion dynamics from strainmeter and microbarometer observations, Soufriere Hills Volcano, Montserrat: 2008-2009, Geophys. Res. Lett., 37, L00E24, doi: 10.1029/2010GL044661.

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