Dependency of near-field ground motions on the structural maturity of the ruptured faults

M. Radiguet, F. Cotton, I. Manighetti, M. Campillo, J. Douglas

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Little work has been undertaken to examine the role of specific long-term fault properties on earthquake ground motions. Here, we empirically examine the influence of the structural maturity of faults on the strong ground motions generated by the rupture of these faults, and we compare the influence of fault maturity to that of other source properties (slip mode, and blind versus surface rupturing). We analyze the near-field ground motions recorded at rock sites for 28 large (Mw 5.6-7.8) crustal earthquakes of various slip modes. The structural maturity of the faults broken by those earthquakes is classified into three classes (mature, intermediate, and immature) based on the combined knowledge of the age, slip rate, cumulative slip, and length of the faults. We compare the recorded ground motions to the empirical prediction equation of Boore et al. (1997). At all frequencies, earthquakes on immature faults produce ground motions 1.5 times larger than those generated by earthquakes on mature faults. The fault maturity appears to be associated with larger differences in ground-motion amplitude than the style of faulting (factor of 1.35 between reverse and strike-slip earthquakes) and the surface rupture occurrence (factor of 1.2 between blind and surface-rupturing earthquakes). However, the slip mode and the fault maturity are dependent parameters, and we suggest that the effect of slip mode may only be apparent, actually resulting from the maturity control. We conclude that the structural maturity of faults is an important parameter that should be considered in seismic hazard assessment.

LanguageEnglish
Pages2572-2581
Number of pages10
JournalBulletin of the Seismological Society of America
Volume99
Issue number4
DOIs
Publication statusPublished - Aug 2009

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ground motion
Earthquakes
near fields
slip
earthquakes
earthquake
rupturing
Faulting
rupture
hazards
Hazards
Rocks
occurrences
rocks
slip rate
hazard assessment
seismic hazard
faulting
predictions
prediction

Keywords

  • crustal earthquakes
  • earthquake ground motions
  • ground motions
  • ground-motion
  • near-field ground motions
  • prediction equations
  • seismic hazard assessment
  • slip rates
  • strike-slip earthquakes
  • strong ground motion
  • surface ruptures

Cite this

Radiguet, M. ; Cotton, F. ; Manighetti, I. ; Campillo, M. ; Douglas, J. / Dependency of near-field ground motions on the structural maturity of the ruptured faults. In: Bulletin of the Seismological Society of America. 2009 ; Vol. 99, No. 4. pp. 2572-2581.
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Dependency of near-field ground motions on the structural maturity of the ruptured faults. / Radiguet, M.; Cotton, F.; Manighetti, I.; Campillo, M.; Douglas, J.

In: Bulletin of the Seismological Society of America, Vol. 99, No. 4, 08.2009, p. 2572-2581.

Research output: Contribution to journalArticle

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