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Published July 15, 2001 | Published + Discussion
Journal Article Open

How fast is rupture during an earthquake? New insights from the 1999 Turkey Earthquakes


We report that during the two devastating 1999 earthquakes in Turkey, rupture propagated over a large part of the nearly 200km long fault zone at supershear speed approaching 5km/s. We present observations and modeling which confirm the original inference of supershear rupture during the Izmit earthquake and we show that supershear rupture also occurred during the Düzce earthquake. We show that the rupture velocity measured—about √2 times the shear wave velocity—is the value predicted by theoretical studies in fracture dynamics. We look for clues to explain these observations.

Additional Information

Copyright 2001 by the American Geophysical Union. (Received March 2, 2001; accepted May 7, 2001.) We thank the scientists and technicians at the General Directorate of Disaster Affairs and at Boğaziqi University who are in charge of the strong motion stations whose recordings are used in the present study. We thank Shamita Das and Pascal Bernard for their comments. Reply to comment on "How fast is rupture during an earthquake? New insights from the 1999 Turkey earthquakes". Michel Bouchon and Ares J. Rosakis. Geophysical Research Letters, Volume 29, Issue 8, pages 84-1–84-2, April 2002.

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Published - grl14724.pdf

Discussion - grl15863.pdf


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