A seismic gap along an accreting plate boundary : Example of the Djibouti Ridge, Afar, East Africa
Article first published online: 7 DEC 2012
Copyright 1983 by the American Geophysical Union.
Geophysical Research Letters
Volume 10, Issue 5, pages 381–384, May 1983
How to Cite
(1983), A seismic gap along an accreting plate boundary : Example of the Djibouti Ridge, Afar, East Africa. Geophysical Research Letters, 10: 381–384. doi: 10.1029/GL010i005p00381
- Issue published online: 7 DEC 2012
- Article first published online: 7 DEC 2012
- Manuscript Accepted: 28 FEB 1983
- Manuscript Received: 21 JAN 1983
A segment of the Gulf of Tadjoura (Djibouti, East-Africa) accreting plate boundary, shows a period of quiescence in the seismic activity since 1974. This segment corresponds to the extension area of the aftershock activity that has occured after a cluster of magnitude 5.5 earthquakes in April 1973. From this example we propose that the seismic gap concept can be extended to moderate earthquakes occuring at extensional plate boundaries. The magnitude of the largest earthquakes at the spreading axis is limited by the size of the rupture length and by the strength of the brittle lithosphere. In the case of the Djibouti ridge recurrence time of 10-20 years are found for earthquakes of about M =6.