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D. Toomey, G. Foulger (1989)
Tomographic inversion of local earthquake data from the Hengill‐Grensdalur Central Volcano Complex, IcelandJournal of Geophysical Research, 94
(1989)
Application of tomographic inversion to local earthquake data from the Hengill-Grensdalur central volcano complex, Iceland
W. Menke, V. Levin, Ravi Sethi (1995)
Seismic attenuation in the crust at the mid-Atlantic plate boundary in south-west IcelandGeophysical Journal International, 122
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B. Julian, G. Foulger (1996)
Earthquake mechanisms from linear-programming inversion of seismic-wave amplitude ratiosBulletin of the Seismological Society of America
R. Stefánsson, Reynir Böđvarsson, R. Slunga, P. Einarsson, S. Jakobsdóttir, H. Bungum, S. Gregersen, J. Havskov, J. Hjelme, H. Korhonen (1993)
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H. Shimizu, S. Ueki, J. Koyama (1987)
A tensile — shear crack model for the mechanism of volcanic earthquakesTectonophysics, 144
G. Foulger, R. Long (1984)
Anomalous focal mechanisms: tensile crack formation on an accreting plate boundaryNature, 310
B. Julian, A. Miller, G. Foulger (1998)
Non‐double‐couple earthquakes 1. TheoryReviews of Geophysics, 36
A. Ross, G. Foulger, B. Julian (1996)
Non‐double‐couple earthquake mechanisms at the Geysers Geothermal Area, CaliforniaGeophysical Research Letters, 23
B. Julian (1986)
Analysing seismic-source mechanisms by linear-programming methodsGeophysical Journal International, 84
A. Miller (1996)
Seismic structure and earthquake focal mechanisms of the Hengill volcanic complex, SW Iceland
Geological Survey, 345 Middlefield Rd
(1984)
Anomalous focal mechanism solutions : evidence for tensile crack formation on an accreting plate boundary
G. Foulger (1988)
HENGILL TRIPLE JUNCTION, SW ICELAND 2. ANOMALOUS EARTHQUAKE FOCAL MECHANISMS AND IMPLICATIONS FOR PROCESS WITHIN THE GEOTHERMAL RESERVOIR AND AT ACCRETIONARY PLATE BOUNDARIESJournal of Geophysical Research, 93
(1996)
Non-doublecouple earthquake mechanisms at The Geysers geothermal area
J. Hudson, R. Pearce, R. Rogers (1989)
Source type plot for inversion of the moment tensorJournal of Geophysical Research, 94
G. Foulger, A. Miller, B. Julian, J. Evans (1995)
Three‐dimensional υp and υp/υs structure of the Hengill Triple Junction and Geothermal Area, Iceland, and the repeatability of tomographic inversionGeophysical Research Letters, 22
G. Foulger, D. Toomey (1989)
Structure and evolution of the Hengill‐Grensdalur Volcanic Complex, Iceland: Geology, geophysics, and seismic tomographyJournal of Geophysical Research, 94
(1996)
Non-doublecouple earthquake mechanisms
G. Foulger, B. Julian (1993)
Non-double-couple earthquakes at the Hengill-Grensdalur volcanic complex, Iceland: Are they artifacts of crustal heterogeneity?Bulletin of the Seismological Society of America, 83
B. Julian, D. Gubbins (1977)
Three-dimensional seismic ray tracingJournal of geophysics, 43
The Hengill‐Grensdalur area in Iceland generates frequent small non‐double‐couple earthquakes with explosive volumetric components. We collected high quality three‐component digital recordings of 4,000 earthquakes on a purpose‐designed, 32‐station network in 1991, and determined focal mechanisms for 100 of the best‐recorded earthquakes by inverting amplitude ratios. Many of the mechanisms are consistent, within the errors, with simultaneous shear and tensile faulting, with tensile faults parallel to the local spreading ridge, and shear faulting similar to that in the South Iceland transform‐fault zone. Some events cannot be explained by this model, however, and require other processes, such as crack closing and partial compensation of tensile cracks by fluid flow.
Geophysical Research Letters – Wiley
Published: Apr 1, 1997
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