Crust-mantle boundary in eastern North America, from the (oldest) craton to the (youngest) rift

2017 ◽  
pp. 107-131 ◽  
Author(s):  
Vadim Levin ◽  
Andrea Servali ◽  
Jill VanTongeren ◽  
William Menke ◽  
Fiona Darbyshire
Keyword(s):  
North America ◽  
Eastern North America ◽  
Mantle Boundary

Relations possibles entre la microseismicité récente et l'astroblème de Charlevoix

1983 ◽  
Vol 20 (10) ◽  
pp. 1613-1618 ◽  
Author(s):  
Denis W. Roy ◽  
Reynald DuBerger
Keyword(s):  
Shock Wave ◽  
North America ◽  
Seismic Activity ◽  
Ground Surface ◽  
Vertical Axis ◽  
Normal Faults ◽  
Eastern North America ◽  
Direct Effects ◽  
Mantle Boundary ◽  
Crustal Stresses

The limit of the direct effects of the Charlevoix astrobleme in the upper part of the Earth's crust outlines approximately a revolution paraboloid about a vertical axis. It reaches 14 km in depth below the center of the astrobleme and exhibits a 27 km radius at the present-day ground surface. The microearthquakes, which reflect the regional crustal stresses in eastern North America, occur on the normal faults characteristic of the St. Lawrence Lowland tectonic terrain mainly near the astrobleme paraboloid or near a second paraboloid located 7.9 km outside the first one. This second one could result from some yet undefined interference between the crust–mantle boundary and the shock wave responsible for the formation of the astrobleme 350 Ma ago. The very low seismic activity in the vicinity of Petite-Rivière–Saint-François may imply that energy is now building up in that area.

The Identification and Study of Indian Shell Middens in Eastern North America: 1643–1861

1986 ◽  
Vol 6 (3) ◽  
pp. 227-243 ◽  
Author(s):  
Andrew L. Christenson
Keyword(s):  
Nineteenth Century ◽  
Civil War ◽  
North America ◽  
East Coast ◽  
Eastern North America ◽  
Shell Midden ◽  
Shell Middens ◽  
Work Done

Although the interest in shell middens in North America is often traced to reports of the discoveries in Danish kjoekkenmoeddings in the mid-nineteenth century, extensive shell midden studies were already occurring on the East Coast by that time. This article reviews selected examples of this early work done by geologists and naturalists, which served as a foundation for shell midden studies by archaeologists after the Civil War.

HAVE WE SEEN THE LARGEST EARTHQUAKES IN EASTERN NORTH AMERICA?

2018 ◽  
Author(s):  
James S. Neely ◽  
◽  
Seth Stein ◽  
Miguel Merino ◽  
John Adams
Keyword(s):  
North America ◽  
Eastern North America
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