TY - JOUR
T1 - Diking-induced moderate-magnitude earthquakes on a youthful rift border fault
T2 - The 2002 Nyiragongo-Kalehe sequence, D.R. Congo
AU - Wauthier, C.
AU - Smets, B.
AU - Keir, D.
N1 - Funding Information:
The interferograms were processed using ROI-PAC software and unwrapped with SNAPHU. The authors thank Nicolas d''Oreye, Val?rie Cayol, Fran?ois Kervyn, and Cindy Ebinger for useful discussions. The authors also thank M. Poland (USGS) for providing the RADARSAT-1 data and Erin DiMaggio for corrections of an earlier version of this manuscript. Beno?t Smets is supported by the National Research Fund of Luxembourg (AFR PhD grant 3221321), the GeoRisCA Project (Belgian Science Policy Office, SSD Program, Contract SD/RI/02A), and the Vi-X Project (Belgian Science Policy Office, STEREO II Program, Contract SR/00/150; FNR Luxembourg, INTER Program; DLR, grant NTI_INSA0525). Derek Keir acknowledges support from Natural Environment Research Council grant NE/L013932/1. The facilities of IRIS Data Services, and specifically the IRIS Data Management Center, were used for access to waveforms, related metadata, and/or derived products from station MBAR used in this study. IRIS Data Services are funded through the Seismological Facilities for the Advancement of Geoscience and EarthScope (SAGE) Proposal of the National Science Foundation under Cooperative Agreement EAR-1261681. Finally, the authors are grateful to the Editor-in-Chief Thorsten Becker as well as to two anonymous reviewers for their thoughtful comments and suggestions.
Publisher Copyright:
© 2015. The Authors.
PY - 2015/12
Y1 - 2015/12
N2 - 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.
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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U2 - 10.1002/2015GC006110
DO - 10.1002/2015GC006110
M3 - Article
AN - SCOPUS:84955382747
VL - 16
SP - 4280
EP - 4291
JO - Geochemistry, Geophysics, Geosystems
JF - Geochemistry, Geophysics, Geosystems
SN - 1525-2027
IS - 12
ER -