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Journal Articles Eos, Transactions American Geophysical Union Year : 2005

Seafloor Margin Map Helps in Understanding Subduction Earthquakes

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J.-Y. Collot
  • Function : Author
S. Migeon
G. Spence
  • Function : Author
Y. Le Gonidec
  • Function : Author
B. Marcaillou
J.-L. Schneider
  • Function : Author
F. Michaud
  • Function : Author
A. Alvarado
  • Function : Author
Jean-Frédéric Lebrun
  • Function : Author
M. Sosson
A. Pazmino
  • Function : Author

Abstract

Ecuador and southwest (SW) Colombia suffered widespread damage during the twentieth century as a result of some of the greatest subduction earthquakes and associated tsunamis ever recorded. In 1906, the Ecuador-SW Columbia margin, located at the transition between the continent and deep ocean, ruptured over a 500-kilometer length as a single great (Mw = 8.8) subduction earthquake (Figure 1a) [Kelleher, 1972]. The 1906 rupture zone was partially reactivated in 1942, 1958, and 1979 by earthquakes of Mw 7.7 to 8.2 (Figure 1b), with 100–200 kilometer long rupture zones [Beck and Ruff, 1984]. Such considerable variation in earthquake rupture length and magnitude in this area-s seismic cycles during the last century has raised questions about the nature and enduring significance of the boundaries that exist between rupture zones and about the long-term recurrence interval between earthquakes.
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hal-00453741 , version 1 (03-05-2021)

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J.-Y. Collot, S. Migeon, G. Spence, Y. Le Gonidec, B. Marcaillou, et al.. Seafloor Margin Map Helps in Understanding Subduction Earthquakes. Eos, Transactions American Geophysical Union, 2005, 86 (46), pp.463-465. ⟨10.1029/2005EO460003⟩. ⟨hal-00453741⟩
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