TY  - JOUR
A1  - Reiter, Karsten
A1  - Heidbach, Oliver
A1  - Schmitt, Douglas
A1  - Haug, Kristine
A1  - Ziegler, Moritz O.
A1  - Moeck, Inga
T1  - A revised crustal stress orientation database for Canada
JF  - Tectonophysics : international journal of geotectonics and the geology and physics of the interior of the earth
N2  - The Canadian database on contemporary crustal stress has not been revised systematically in the past two decades. Here we present the results of our new compilation that contains 514 new data records for the orientation data of maximum compressive horizontal stress and 188 data records that were re-assessed. In total the Canadian stress database has now 1667 data records, which is an increase of about 45%. From these data, a new Canadian Stress map as well as one for the Province of Alberta is presented.
 To analyse the stress pattern, we use the quasi median on the circle as a smoothing algorithm that generates a smoothed stress map of the maximum compressive horizontal stress orientation on a regular grid. The newly introduced quasi interquartile range on the circle estimates the spreading of the data and is used as a measure for the wave-length of the stress pattern. The result of the hybrid wavelength analysis confirms that long spatial wavelength stress patterns (>= 1000 km) exist in large areas in Canada. The observed stress pattern is transmitted through the intra-plate regions.
 The results reveal that shorter spatial wave length variation of the maximum compressive horizontal stress orientation of less than 200 km, prevails particularly in south-eastern and western Canada. Regional stress sources such as density contrasts, active fault systems, crustal structures, etc. might have a significant impact in these regions. In contrast to these variations, the observed stress pattern in the Alberta Basin is very homogeneous and mainly controlled by plate boundary forces and body forces. The influence of curvature of the Rocky Mountains salient in southern Alberta is minimal. The present-day horizontal stress orientations determined herein have important implications for the production of hydrocarbons and geothermal energy in the Alberta Basin. (C) 2014 Elsevier B.V. All rights reserved.
KW  - Stress pattern
KW  - Tectonic stress
KW  - Canada
KW  - Alberta
KW  - Database
KW  - Circular statistics
Y1  - 2014
U6  - https://doi.org/10.1016/j.tecto.2014.08.006
SN  - 0040-1951
SN  - 1879-3266
VL  - 636
SP  - 111
EP  - 124
PB  - Elsevier
CY  - Amsterdam
ER  -