Colloque

Comparison of seismic refraction and other geophysical methods in three types of permafrosted terrain, Kangiqsualujjuaq, northern Quebec

Khaled Ben-Miloud

Maurice K. Seguin

Membre a labase

Khaled Ben-Miloud

Résumé du colloque

The study area is located in the southeastern part of Ungava Bay (latitude: 58°30'N and longitude: 65°50'W). The terrains investigated are situated in a valley oriented NW-SE, flanked by steep bedrock scarps partly filled with unconsolidated glacial and marine deposits. These terrains are till, wet sand and gravel and dry sand and gravel. The immediate objectives of the geophysical investigations are related to (1) determination of the thickness of the active layer and permafrost as well as the depth to bedrock obtained with geophysical methods with an emphasis in seismic refraction, (2) comparison of physical properties (electrical resistivity, chargeability and seismic velocity) for the different terrains in the unfrozen and frozen states. The ultimate aim of the surveys is the obtainment of a three-dimensional model of permafrost distribution and groundwater flow. The mean thickness of the active layer and permafrost for the three terrains are: 1.1, 5.4, 0.9, 6.5 and 0.6, 5.6 m respectively. For the same three terrains in the unfrozen state, the velocities are 1200, 1400, 1200 m/s and the resistivities 10³, 5 x 10³ and 10⁴ Ω.m. In permafrosted terrains, the velocities are 2900, 2000, and 1600 m/s and the resistivities 10⁵, 2 x 10⁴ and 10⁴ Ω.m. The polarization yields more accurate determination of permafrost thickness in till than in other terrains. Seismic refraction is more reliable in till than in other terrains.

Contexte

Section :

Géophysique

Thème du colloque :

Géophysique

Hôte : Université d’Ottawa

Découvrez d'autres communications scientifiques

Dans le même colloque
Du même congressiste

Titre du colloque :

Géophysique

Métabasaltes du groupe Harbour Main, est de Terre-Neuve: une étude paléomagnétique

Maurice K. Seguin

Modélisation gravimétrique de l'intrusion du Mont Mégantic

Janusz Frydecki

GLIMPCE - Un levé de sismique profonde dans la région des Grands Lacs

Patrick Morel-A-L'Huissier

Voir tous les contenus de ce colloque

Autres communications du même congressiste :

Thème du colloque :

Géophysique

Comparison of seismic refraction and other geophysical methods in three types of permafrosted terra…

Khaled Ben-Miloud

Simulation of soil-water and heat flow equation to predict the evolution of discontinuous permafros…

Khaled Ben-Miloud

Two-dimensional heat flow modeling of a discontinuous permafrost region in northern Quebec

Khaled Ben-Miloud