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Pregled bibliografske jedinice broj: 444507


Autori: Tkalčić, Hrvoje; Dreger, D.S.; Foulger, G.R.; Julian, B.R.
Naslov: The puzzle of the Bardarbunga, Iceland earthquake: No volumetric component in the source mechanism
Izvornik: Bulletin of the seismological society of america (0037-1106) 99 (2009), 5; 3077-3085
Vrsta rada: članak
Ključne riječi: volcanic earthquake; Bárdarbunga
A volcanic earthquake with Mw 5:6 occurred beneath the Bárdarbunga caldera in Iceland on 29 September 1996. This earthquake is one of a decade-long sequence of M 5 events at Bárdarbunga with non-double-couple mechanisms in the Global Centroid Moment Tensor catalog. Fortunately, it was recorded well by the regional-scale Iceland Hotspot Project seismic experiment. We investigated the event with a complete moment tensor inversion method using regional long-period seismic waveforms and a composite structural model. The moment tensor inversion using data from stations of the Iceland Hotspot Project yields a non-double-couple solution with a 67% vertically oriented compensated linear vector dipole component, a 32% doublecouple component, and a statistically insignificant (2%) volumetric (isotropic) contraction. This indicates the absence of a net volumetric component, which is puzzling in the case of a large volcanic earthquake that apparently is not explained by shear slip on a planar fault. A possible volcanic mechanism that can produce an earthquake without a volumetric component involves two offset sources with similar but opposite volume changes. We show that although such a model cannot be ruled out, the circumstances under which it could happen are rare.
Projekt / tema: 119-1193086-1315
Izvorni jezik: ENG
Rad je indeksiran u
bazama podataka:
Current Contents Connect (CCC)
Science Citation Index Expanded (SCI-EXP) (sastavni dio Web of Science Core Collectiona)
Kategorija: Znanstveni
Znanstvena područja:
URL Internet adrese:
Broj citata:
DOI: 10.1785/0120080361
URL cjelovitog teksta:
Google Scholar: The puzzle of the Bardarbunga, Iceland earthquake: No volumetric component in the source mechanism
Upisao u CROSBI: (, 16. Vel. 2010. u 10:29 sati

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