Can deglaciation trigger earthquakes in N. America?
- 1 May 2000
- journal article
- Published by American Geophysical Union (AGU) in Geophysical Research Letters
- Vol. 27 (9) , 1323-1326
- https://doi.org/10.1029/1999gl011070
Abstract
A spherical, self‐gravitating viscoelastic earth model is used to calculate the spatial and temporal evolution of the glacially induced lithospheric stress and fault stability in North America. The predicted onset time of a pulse of earthquake activities, the mode of failure and the magnitude of instability are investigated for three sites with different distance from the former ice margin. It is found that glacial unloading is able to trigger paleo‐earthquakes within the ice margin near Charlevoix (47.5°N, 70.1°W) and in Wabash Valley (38.5°N, 87°W) outside the ice margin. However, rebound stress decays away from the former ice margin, thus glacial unloading is unlikely to have triggered the large M8 earthquakes in New Madrid (36.6°N, 89.5°W).This publication has 21 references indexed in Scilit:
- Postglacial variations in the level of the sea: Implications for climate dynamics and solid‐Earth geophysicsReviews of Geophysics, 1998
- Radial profile of mantle viscosity: Results from the joint inversion of convection and postglacial rebound observablesJournal of Geophysical Research, 1997
- Changes in orientation of near‐surface stress field as constraints to mantle viscosity and horizontal stress differences in eastern CanadaGeophysical Research Letters, 1996
- THE ENIGMA OF THE NEW MADRID EARTHQUAKES OF 1811–1812Annual Review of Earth and Planetary Sciences, 1996
- Stress/strain changes and triggered seismicity following the Mw7.3 Landers, California earthquakeJournal of Geophysical Research, 1996
- Upper-crustal strength inferred from stress measurements to 6 km depth in the KTB boreholeNature, 1993
- Evidence of late and postglacial seismic activity in the Témiscouata–Madawaska Valley, Quebec – New Brunswick, CanadaCanadian Journal of Earth Sciences, 1992
- Evidence of Strong Earthquake Shaking in the Lower Wabash Valley from Prehistoric Liquefaction FeaturesScience, 1991
- Suppression of earthquakes by large continental ice sheetsNature, 1987
- Postglacial rebound and the focal mechanisms of eastern Canadian earthquakesCanadian Journal of Earth Sciences, 1984