Slab stress and strain rate as constraints on global mantle flow

Laura Alisic, Michael Gurnis, Georg Stadler, Carsten Burstedde, Lucas C. Wilcox, Omar Ghattas

Research output: Contribution to journalArticle

Abstract

Dynamically consistent global models of mantle convection with plates are developed that are consistent with detailed constraints on the state of stress and strain rate from deep focus earthquakes. Models that best fit plateness criteria and plate motion data have strong slabs that have high stresses. The regions containing the MW 8.3 Bolivia and MW 7.6 Tonga 1994 events are considered in detail. Modeled stress orientations match stress patterns from earthquake focal mechanisms. A yield stress of at least 100 MPa is required to fit plate motions and matches the minimum stress requirement obtained from the stress drop for the Bolivia 1994 deep focus event. The minimum strain rate determined from seismic moment release in the Tonga slab provides an upper limit of ∼200 MPa on the strength in the slab.

Original languageEnglish (US)
Article numberL22308
JournalGeophysical Research Letters
Volume37
Issue number22
DOIs
StatePublished - 2010

Fingerprint

strain rate
slab
Earth mantle
slabs
mantle
Bolivia
plate motion
earthquakes
earthquake
mantle convection
seismic moment
focal mechanism
convection
moments
requirements

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Geophysics

Cite this

Alisic, L., Gurnis, M., Stadler, G., Burstedde, C., Wilcox, L. C., & Ghattas, O. (2010). Slab stress and strain rate as constraints on global mantle flow. Geophysical Research Letters, 37(22), [L22308]. https://doi.org/10.1029/2010GL045312

Slab stress and strain rate as constraints on global mantle flow. / Alisic, Laura; Gurnis, Michael; Stadler, Georg; Burstedde, Carsten; Wilcox, Lucas C.; Ghattas, Omar.

In: Geophysical Research Letters, Vol. 37, No. 22, L22308, 2010.

Research output: Contribution to journalArticle

Alisic, L, Gurnis, M, Stadler, G, Burstedde, C, Wilcox, LC & Ghattas, O 2010, 'Slab stress and strain rate as constraints on global mantle flow', Geophysical Research Letters, vol. 37, no. 22, L22308. https://doi.org/10.1029/2010GL045312
Alisic, Laura ; Gurnis, Michael ; Stadler, Georg ; Burstedde, Carsten ; Wilcox, Lucas C. ; Ghattas, Omar. / Slab stress and strain rate as constraints on global mantle flow. In: Geophysical Research Letters. 2010 ; Vol. 37, No. 22.
@article{9b6edbe4772540358f200ad4787a8545,
title = "Slab stress and strain rate as constraints on global mantle flow",
abstract = "Dynamically consistent global models of mantle convection with plates are developed that are consistent with detailed constraints on the state of stress and strain rate from deep focus earthquakes. Models that best fit plateness criteria and plate motion data have strong slabs that have high stresses. The regions containing the MW 8.3 Bolivia and MW 7.6 Tonga 1994 events are considered in detail. Modeled stress orientations match stress patterns from earthquake focal mechanisms. A yield stress of at least 100 MPa is required to fit plate motions and matches the minimum stress requirement obtained from the stress drop for the Bolivia 1994 deep focus event. The minimum strain rate determined from seismic moment release in the Tonga slab provides an upper limit of ∼200 MPa on the strength in the slab.",
author = "Laura Alisic and Michael Gurnis and Georg Stadler and Carsten Burstedde and Wilcox, {Lucas C.} and Omar Ghattas",
year = "2010",
doi = "10.1029/2010GL045312",
language = "English (US)",
volume = "37",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "American Geophysical Union",
number = "22",

}

TY - JOUR

T1 - Slab stress and strain rate as constraints on global mantle flow

AU - Alisic, Laura

AU - Gurnis, Michael

AU - Stadler, Georg

AU - Burstedde, Carsten

AU - Wilcox, Lucas C.

AU - Ghattas, Omar

PY - 2010

Y1 - 2010

N2 - Dynamically consistent global models of mantle convection with plates are developed that are consistent with detailed constraints on the state of stress and strain rate from deep focus earthquakes. Models that best fit plateness criteria and plate motion data have strong slabs that have high stresses. The regions containing the MW 8.3 Bolivia and MW 7.6 Tonga 1994 events are considered in detail. Modeled stress orientations match stress patterns from earthquake focal mechanisms. A yield stress of at least 100 MPa is required to fit plate motions and matches the minimum stress requirement obtained from the stress drop for the Bolivia 1994 deep focus event. The minimum strain rate determined from seismic moment release in the Tonga slab provides an upper limit of ∼200 MPa on the strength in the slab.

AB - Dynamically consistent global models of mantle convection with plates are developed that are consistent with detailed constraints on the state of stress and strain rate from deep focus earthquakes. Models that best fit plateness criteria and plate motion data have strong slabs that have high stresses. The regions containing the MW 8.3 Bolivia and MW 7.6 Tonga 1994 events are considered in detail. Modeled stress orientations match stress patterns from earthquake focal mechanisms. A yield stress of at least 100 MPa is required to fit plate motions and matches the minimum stress requirement obtained from the stress drop for the Bolivia 1994 deep focus event. The minimum strain rate determined from seismic moment release in the Tonga slab provides an upper limit of ∼200 MPa on the strength in the slab.

UR - http://www.scopus.com/inward/record.url?scp=78649520061&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=78649520061&partnerID=8YFLogxK

U2 - 10.1029/2010GL045312

DO - 10.1029/2010GL045312

M3 - Article

VL - 37

JO - Geophysical Research Letters

JF - Geophysical Research Letters

SN - 0094-8276

IS - 22

M1 - L22308

ER -