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State of stress in central and eastern North American seismic zones

Mazzotti, Stephane, Townend, John·2010·Lithosphere
DOI 10.1130/l65.1
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Abstract

We use a Bayesian analysis to determine the state of stress from focal mechanisms in ten seismic zones in central and eastern North America and compare it with regional stress inferred from borehole measurements. Comparisons of the seismologically determined azimuth of the maximum horizontal compressive stress (S HS ) with that determined from boreholes (S HB ) exhibit a bimodal pattern: In four zones, the S HS and regional S HB orientations are closely parallel, whereas in the Charlevoix, Lower St. Lawrence, and Central Virginia zones, the S HS azimuth shows a statistically significant 30°-50° clockwise rotation relative to the regional S HB azimuth. This pattern is exemplified by the northwest and southeast seismicity clusters in Charlevoix, which yield S HS orientations strictly parallel and strongly oblique, respectively, to the regional S HB trend. Similar ~30° clockwise rotations are found for the North Appalachian zone and for the 2003 Bardwell earthquake sequence north of the New Madrid zone. The S HB /S HS rotations occur over 20-100 km in each seismic zone, but they are observed in zones separated by distances of up to 1500 km. A possible mechanism for the stress rotations may be the interaction between a long-wavelength stress perturbation source, such as postglacial rebound, and local stress concentrators, such as low-friction faults. The latter would allow low-magnitude (<10 MPa) postglacial rebound stresses to locally perturb the preexisting stress field in some…

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  • Under the NE-SW trending maximum horizontal current stress regime and with broad regional uplift along the OBG fault zone lowering vertical stress, NW-SE trending pre-existing structures in the OBG could potentially be reactivated in a reverse sense.

    “For instance, under the NE-SW trending maximum horizontal current stress regime (Mazzotti and Townend 2010), and with the broad regional uplift along the OBG fault zone (Figure 8) lowering the vertical stress, NW-SE trending pre-existing structures in the OBG, could potentially be reactivated in a reverse sense.”

    From Tectonic geomorphology of the Ottawa-Bonnechere Graben, Eastern Canada: implications for regional uplift and intraplate seismicity (2023) · cites this paper as Mazzotti and Townend 2010

  • With their NW-SE to WNW-ESE striking faults, section 2 down to section 3 near Eardley Faults and WSW-ENE striking faults, section 4 near Gatineau Fault lie perpendicular to the present-day maximum horizontal stress.

    “With their NW-SE to WNW-ESE striking faults, section 2 down to section 3 near Eardley Faults (fault 3 in Figure 1) and WSW-ENE striking faults, section 4 near Gatineau Fault (fault 4 in Figure 1) lie perpendicular to the present-day maximum horizontal stress”

    From Tectonic geomorphology of the Ottawa-Bonnechere Graben, Eastern Canada: implications for regional uplift and intraplate seismicity (2023) · cites this paper as Mazzotti and Townend 2010

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Research works printed but not linked: 30

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Metadata

Authors
Mazzotti, S., & Townend, J.
Venue
Lithosphere
Publisher
GeoScienceWorld
Published
2010-04
Volume
2
Issue
2
Pages
76-83
ISSN
  • 1947-4253
  • 1941-8264
DOI
10.1130/l65.1
Cited by
77
References
0
Language
en

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