thumbnail

Non-double-couple earthquake mechanisms at the Hengill-Grensdalur volcanic complex, southwest Iceland

Geophysical Research Letters

By:
, , and

Links

  • The Publications Warehouse does not have links to digital versions of this publication at this time
  • Download citation as: RIS

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.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Non-double-couple earthquake mechanisms at the Hengill-Grensdalur volcanic complex, southwest Iceland
Series title:
Geophysical Research Letters
Volume
24
Issue:
7
Year Published:
1997
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geophysical Research Letters
First page:
743
Last page:
746