Finite element modeling of stress in the nazca plate: Driving forces and plate boundary earthquakes

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Finite element methods are applied to an analysis of the state of stress within the Nazca plate due to plate driving forces and large plate boundary earthquakes. The wave front solution technique is used in a static analysis of the deformation of an elastic plate. Ridge pushing forces are required in all models that match the nearly east-west horizontal compression inferred from two thrust earthquakes in the interior of the Nazca plate. The net pulling force of the subducting slab on the oceanic plate is at most comparable to ridge pushing forces. Regional intraplate deviatoric stresses are estimated to be on the order of a few hundred bars. Changes in the Nazca intraplate stress field due to the 1960 Chilean earthquake are, at most, a few tens of bars locally and about one bar at greater distances into the plate. Such variations only occur after complete stress relaxation of a viscous asthenosphere and imply that the changes in the intraplate stress field due to large plate boundary earthquakes are probably not significant unless the lithosphere is very near failure. Displacements within the plate due to large plate boundary earthquakes should be observable using precise geodetic measurement techniques.

Original languageEnglish (US)
Pages (from-to)223-248
Number of pages26
JournalTectonophysics
Volume50
Issue number2-3
DOIs
StatePublished - Oct 10 1978
Externally publishedYes

Fingerprint

Nazca plate
plate boundary
earthquakes
earthquake
modeling
stress field
pushing
asthenosphere
stress distribution
ridges
finite element method
slab
lithosphere
thrust
compression
elastic plates
pulling
stress relaxation
wave fronts
slabs

ASJC Scopus subject areas

  • Earth-Surface Processes
  • Geophysics

Cite this

Finite element modeling of stress in the nazca plate : Driving forces and plate boundary earthquakes. / Richardson, Randall.

In: Tectonophysics, Vol. 50, No. 2-3, 10.10.1978, p. 223-248.

Research output: Contribution to journalArticle

@article{4be7ea8db3bf465fa71e5b65aabf30d2,
title = "Finite element modeling of stress in the nazca plate: Driving forces and plate boundary earthquakes",
abstract = "Finite element methods are applied to an analysis of the state of stress within the Nazca plate due to plate driving forces and large plate boundary earthquakes. The wave front solution technique is used in a static analysis of the deformation of an elastic plate. Ridge pushing forces are required in all models that match the nearly east-west horizontal compression inferred from two thrust earthquakes in the interior of the Nazca plate. The net pulling force of the subducting slab on the oceanic plate is at most comparable to ridge pushing forces. Regional intraplate deviatoric stresses are estimated to be on the order of a few hundred bars. Changes in the Nazca intraplate stress field due to the 1960 Chilean earthquake are, at most, a few tens of bars locally and about one bar at greater distances into the plate. Such variations only occur after complete stress relaxation of a viscous asthenosphere and imply that the changes in the intraplate stress field due to large plate boundary earthquakes are probably not significant unless the lithosphere is very near failure. Displacements within the plate due to large plate boundary earthquakes should be observable using precise geodetic measurement techniques.",
author = "Randall Richardson",
year = "1978",
month = "10",
day = "10",
doi = "10.1016/0040-1951(78)90137-3",
language = "English (US)",
volume = "50",
pages = "223--248",
journal = "Tectonophysics",
issn = "0040-1951",
publisher = "Elsevier",
number = "2-3",

}

TY - JOUR

T1 - Finite element modeling of stress in the nazca plate

T2 - Driving forces and plate boundary earthquakes

AU - Richardson, Randall

PY - 1978/10/10

Y1 - 1978/10/10

N2 - Finite element methods are applied to an analysis of the state of stress within the Nazca plate due to plate driving forces and large plate boundary earthquakes. The wave front solution technique is used in a static analysis of the deformation of an elastic plate. Ridge pushing forces are required in all models that match the nearly east-west horizontal compression inferred from two thrust earthquakes in the interior of the Nazca plate. The net pulling force of the subducting slab on the oceanic plate is at most comparable to ridge pushing forces. Regional intraplate deviatoric stresses are estimated to be on the order of a few hundred bars. Changes in the Nazca intraplate stress field due to the 1960 Chilean earthquake are, at most, a few tens of bars locally and about one bar at greater distances into the plate. Such variations only occur after complete stress relaxation of a viscous asthenosphere and imply that the changes in the intraplate stress field due to large plate boundary earthquakes are probably not significant unless the lithosphere is very near failure. Displacements within the plate due to large plate boundary earthquakes should be observable using precise geodetic measurement techniques.

AB - Finite element methods are applied to an analysis of the state of stress within the Nazca plate due to plate driving forces and large plate boundary earthquakes. The wave front solution technique is used in a static analysis of the deformation of an elastic plate. Ridge pushing forces are required in all models that match the nearly east-west horizontal compression inferred from two thrust earthquakes in the interior of the Nazca plate. The net pulling force of the subducting slab on the oceanic plate is at most comparable to ridge pushing forces. Regional intraplate deviatoric stresses are estimated to be on the order of a few hundred bars. Changes in the Nazca intraplate stress field due to the 1960 Chilean earthquake are, at most, a few tens of bars locally and about one bar at greater distances into the plate. Such variations only occur after complete stress relaxation of a viscous asthenosphere and imply that the changes in the intraplate stress field due to large plate boundary earthquakes are probably not significant unless the lithosphere is very near failure. Displacements within the plate due to large plate boundary earthquakes should be observable using precise geodetic measurement techniques.

UR - http://www.scopus.com/inward/record.url?scp=0000285227&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0000285227&partnerID=8YFLogxK

U2 - 10.1016/0040-1951(78)90137-3

DO - 10.1016/0040-1951(78)90137-3

M3 - Article

AN - SCOPUS:0000285227

VL - 50

SP - 223

EP - 248

JO - Tectonophysics

JF - Tectonophysics

SN - 0040-1951

IS - 2-3

ER -