Non‐double‐couple earthquake mechanisms at the Hengill‐Grensdalur Volcanic Complex, Southwest Iceland

Non‐double‐couple earthquake mechanisms at the Hengill‐Grensdalur Volcanic Complex,... 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Geophysical Research Letters Wiley

Non‐double‐couple earthquake mechanisms at the Hengill‐Grensdalur Volcanic Complex, Southwest Iceland

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Publisher
Wiley
Copyright
Copyright © 1997 by the American Geophysical Union.
ISSN
0094-8276
eISSN
1944-8007
DOI
10.1029/97GL00499
Publisher site
See Article on Publisher Site

Abstract

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.

Journal

Geophysical Research LettersWiley

Published: Apr 1, 1997

References

  • Non‐double‐couple earthquake mechanisms at The Geysers geothermal area, California
    Ross, Ross; Foulger, Foulger; Julian, Julian

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