Diking-induced moderate-magnitude earthquakes on a youthful rift border fault: The 2002 Nyiragongo-Kalehe sequence, D.R. Congo

C. Wauthier, B. Smets, D. Keir

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

On 24 October 2002, Mw 6.2 earthquake occurred in the central part of the Lake Kivu basin, Western Branch of the East African Rift. This is the largest event recorded in the Lake Kivu area since 1900. An integrated analysis of radar interferometry (InSAR), seismic and geological data, demonstrates that the earthquake occurred due to normal-slip motion on a major preexisting east-dipping rift border fault. A Coulomb stress analysis suggests that diking events, such as the January 2002 dike intrusion, could promote faulting on the western border faults of the rift in the central part of Lake Kivu. We thus interpret that dike-induced stress changes can cause moderate to large-magnitude earthquakes on major border faults during continental rifting. Continental extension processes appear complex in the Lake Kivu basin, requiring the use of a hybrid model of strain accommodation and partitioning in the East African Rift.

Original languageEnglish (US)
Pages (from-to)4280-4291
Number of pages12
JournalGeochemistry, Geophysics, Geosystems
Volume16
Issue number12
DOIs
StatePublished - Dec 2015

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earthquake magnitude
borders
lakes
Lakes
Earthquakes
earthquakes
Levees
dike
rock intrusions
Catchments
earthquake
radar interferometry
stress analysis
stress change
lake
Faulting
rifting
accommodation
faulting
partitioning

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

Cite this

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Diking-induced moderate-magnitude earthquakes on a youthful rift border fault : The 2002 Nyiragongo-Kalehe sequence, D.R. Congo. / Wauthier, C.; Smets, B.; Keir, D.

In: Geochemistry, Geophysics, Geosystems, Vol. 16, No. 12, 12.2015, p. 4280-4291.

Research output: Contribution to journalArticle

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AB - On 24 October 2002, Mw 6.2 earthquake occurred in the central part of the Lake Kivu basin, Western Branch of the East African Rift. This is the largest event recorded in the Lake Kivu area since 1900. An integrated analysis of radar interferometry (InSAR), seismic and geological data, demonstrates that the earthquake occurred due to normal-slip motion on a major preexisting east-dipping rift border fault. A Coulomb stress analysis suggests that diking events, such as the January 2002 dike intrusion, could promote faulting on the western border faults of the rift in the central part of Lake Kivu. We thus interpret that dike-induced stress changes can cause moderate to large-magnitude earthquakes on major border faults during continental rifting. Continental extension processes appear complex in the Lake Kivu basin, requiring the use of a hybrid model of strain accommodation and partitioning in the East African Rift.

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