### Abstract

It is common practice to use ground-motion models, often developed by regression on recorded accelerograms, to predict the expected earthquake response spectra at sites of interest. An important consideration when selecting these models is the possible dependence of ground motions on geographical region, i.e., are median ground motions in the (target) region of interest for a given magnitude and distance the same as those in the (host) region where a ground-motion model is from, and are the aleatoric variabilities of ground motions also similar? These questions can be particularly difficult to tackle in many regions of the world where little observed strong-motion data is available since there are few records to validate the choice of model. Reasons for regionally dependent ground motions are discussed and possible regional dependence of earthquake response spectra is examined using published ground-motion models, observed accelerograms and also by using ground motions predicted by published stochastic models. It is concluded that although some regions seem to show considerable differences in spectra it is currently more defensible to use well-constrained models, possibly based on data from other regions, rather than use predicted motions from local, often poorly-constrained, models.

Language | English |
---|---|

Article number | 477 |

Pages | 71-99 |

Number of pages | 29 |

Journal | ISET Journal of Earthquake Technology |

Volume | 44 |

Issue number | 1 |

Publication status | Published - Mar 2007 |

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### Keywords

- analysis of variance
- attenuation relationships
- ground-motion estimation
- regional dependence
- stochastic method

### Cite this

*ISET Journal of Earthquake Technology*,

*44*(1), 71-99. [477].

}

*ISET Journal of Earthquake Technology*, vol. 44, no. 1, 477, pp. 71-99.

**On the regional dependence of earthquake response spectra.** / Douglas, John.

Research output: Contribution to journal › Article

TY - JOUR

T1 - On the regional dependence of earthquake response spectra

AU - Douglas, John

PY - 2007/3

Y1 - 2007/3

N2 - It is common practice to use ground-motion models, often developed by regression on recorded accelerograms, to predict the expected earthquake response spectra at sites of interest. An important consideration when selecting these models is the possible dependence of ground motions on geographical region, i.e., are median ground motions in the (target) region of interest for a given magnitude and distance the same as those in the (host) region where a ground-motion model is from, and are the aleatoric variabilities of ground motions also similar? These questions can be particularly difficult to tackle in many regions of the world where little observed strong-motion data is available since there are few records to validate the choice of model. Reasons for regionally dependent ground motions are discussed and possible regional dependence of earthquake response spectra is examined using published ground-motion models, observed accelerograms and also by using ground motions predicted by published stochastic models. It is concluded that although some regions seem to show considerable differences in spectra it is currently more defensible to use well-constrained models, possibly based on data from other regions, rather than use predicted motions from local, often poorly-constrained, models.

AB - It is common practice to use ground-motion models, often developed by regression on recorded accelerograms, to predict the expected earthquake response spectra at sites of interest. An important consideration when selecting these models is the possible dependence of ground motions on geographical region, i.e., are median ground motions in the (target) region of interest for a given magnitude and distance the same as those in the (host) region where a ground-motion model is from, and are the aleatoric variabilities of ground motions also similar? These questions can be particularly difficult to tackle in many regions of the world where little observed strong-motion data is available since there are few records to validate the choice of model. Reasons for regionally dependent ground motions are discussed and possible regional dependence of earthquake response spectra is examined using published ground-motion models, observed accelerograms and also by using ground motions predicted by published stochastic models. It is concluded that although some regions seem to show considerable differences in spectra it is currently more defensible to use well-constrained models, possibly based on data from other regions, rather than use predicted motions from local, often poorly-constrained, models.

KW - analysis of variance

KW - attenuation relationships

KW - ground-motion estimation

KW - regional dependence

KW - stochastic method

UR - http://www.scopus.com/inward/record.url?scp=44149124874&partnerID=8YFLogxK

UR - http://home.iitk.ac.in/~vinaykg/issue22.html

M3 - Article

VL - 44

SP - 71

EP - 99

JO - ISET Journal of Earthquake Technology

T2 - ISET Journal of Earthquake Technology

JF - ISET Journal of Earthquake Technology

SN - 0972-0405

IS - 1

M1 - 477

ER -