Coulomb stress changes in the South Iceland Seismic Zone due to two large earthquakes in June 2000

Thóra Árnadóttir*, Sigurjon Jonsson, Rikke Pedersen, Gunnar B. Gudmundsson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

The South Iceland Seismic Zone experienced the largest earthquakes for 88 years in June 2000, with a MS = 6.6 event on June 17, followed by another MS = 6.6 earthquake on June 21. These events occured on two parallel N-S striking, right-lateral strike slip faults, separated by about 17 km. We calculate the static Coulomb stress change for the June 17 and 21 earthquakes using a distributed slip model derived from joint inversion of InSAR and GPS data. We find that the static stress change caused by the June 17 event is about 0.1 MPa at the location of the June 21 hypocenter, promoting failure on the second fault. Locations of aftershocks agree well with areas of increased Coulomb failure stress. Our calculations indicate that positive stress changes due to the two earthquakes make the area west of the June 21 rupture the most likely site of the next large earthquake in South Iceland.

Original languageEnglish (US)
Pages (from-to)9-1
Number of pages9
JournalGeophysical Research Letters
Volume30
Issue number5
StatePublished - Mar 1 2003

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

Fingerprint

Dive into the research topics of 'Coulomb stress changes in the South Iceland Seismic Zone due to two large earthquakes in June 2000'. Together they form a unique fingerprint.

Cite this