### Abstract

In this short article, the possible reduction in the standard deviation of empirical ground motion estimation equations through the modelling of the effect of crustal structure is assessed through the use of ground-motion simulations. Simulations are computed for different source-to-site distances, focal depths, focal mechanisms and for crustal models of the Pyrenees, the western Alps and the upper Rhine Graben. Through the method of equivalent hypocentral distance introduced by Douglas et al. [(2004) Bull Earthquake Eng 2(1): 75-99] to model the effect of crustal structure in empirical equations, the scatter associated with such equations derived using these simulated data could be reduced to zero if real-to-equivalent hypocentral distance mapping functions were derived for every combination of mechanism, depth and crustal structure present in the simulated dataset. This is, obviously, impractical. The relative importance of each parameter in affecting the decay of ground motions is assessed here. It is found that variation in focal depth is generally more important than the effect of crustal structure when deriving the real-to-equivalent hypocentral distance mapping functions. In addition, mechanism and magnitude do not have an important impact on the decay rate.

Original language | English |
---|---|

Pages (from-to) | 17-26 |

Number of pages | 10 |

Journal | Bulletin of Earthquake Engineering |

Volume | 5 |

Issue number | 1 |

Early online date | 13 Sep 2006 |

DOIs | |

Publication status | Published - 1 Feb 2007 |

### Fingerprint

### Keywords

- attenuation relations
- crustal structure
- equivalent hypocentral distance
- France
- ground-motion estimation equations
- ground-motion models
- standard deviation
- strong ground motion

### Cite this

*Bulletin of Earthquake Engineering*,

*5*(1), 17-26. https://doi.org/10.1007/s10518-006-9017-y

}

*Bulletin of Earthquake Engineering*, vol. 5, no. 1, pp. 17-26. https://doi.org/10.1007/s10518-006-9017-y

**The importance of crustal structure in explaining the observed uncertainties in ground motion estimation.** / Douglas, John; Aochi, Hideo; Suhadolc, Peter; Costa, Giovanni.

Research output: Contribution to journal › Article

TY - JOUR

T1 - The importance of crustal structure in explaining the observed uncertainties in ground motion estimation

AU - Douglas, John

AU - Aochi, Hideo

AU - Suhadolc, Peter

AU - Costa, Giovanni

PY - 2007/2/1

Y1 - 2007/2/1

N2 - In this short article, the possible reduction in the standard deviation of empirical ground motion estimation equations through the modelling of the effect of crustal structure is assessed through the use of ground-motion simulations. Simulations are computed for different source-to-site distances, focal depths, focal mechanisms and for crustal models of the Pyrenees, the western Alps and the upper Rhine Graben. Through the method of equivalent hypocentral distance introduced by Douglas et al. [(2004) Bull Earthquake Eng 2(1): 75-99] to model the effect of crustal structure in empirical equations, the scatter associated with such equations derived using these simulated data could be reduced to zero if real-to-equivalent hypocentral distance mapping functions were derived for every combination of mechanism, depth and crustal structure present in the simulated dataset. This is, obviously, impractical. The relative importance of each parameter in affecting the decay of ground motions is assessed here. It is found that variation in focal depth is generally more important than the effect of crustal structure when deriving the real-to-equivalent hypocentral distance mapping functions. In addition, mechanism and magnitude do not have an important impact on the decay rate.

AB - In this short article, the possible reduction in the standard deviation of empirical ground motion estimation equations through the modelling of the effect of crustal structure is assessed through the use of ground-motion simulations. Simulations are computed for different source-to-site distances, focal depths, focal mechanisms and for crustal models of the Pyrenees, the western Alps and the upper Rhine Graben. Through the method of equivalent hypocentral distance introduced by Douglas et al. [(2004) Bull Earthquake Eng 2(1): 75-99] to model the effect of crustal structure in empirical equations, the scatter associated with such equations derived using these simulated data could be reduced to zero if real-to-equivalent hypocentral distance mapping functions were derived for every combination of mechanism, depth and crustal structure present in the simulated dataset. This is, obviously, impractical. The relative importance of each parameter in affecting the decay of ground motions is assessed here. It is found that variation in focal depth is generally more important than the effect of crustal structure when deriving the real-to-equivalent hypocentral distance mapping functions. In addition, mechanism and magnitude do not have an important impact on the decay rate.

KW - attenuation relations

KW - crustal structure

KW - equivalent hypocentral distance

KW - France

KW - ground-motion estimation equations

KW - ground-motion models

KW - standard deviation

KW - strong ground motion

UR - http://www.scopus.com/inward/record.url?scp=33846821507&partnerID=8YFLogxK

UR - http://link.springer.com/journal/10518

U2 - 10.1007/s10518-006-9017-y

DO - 10.1007/s10518-006-9017-y

M3 - Article

VL - 5

SP - 17

EP - 26

JO - Bulletin of Earthquake Engineering

JF - Bulletin of Earthquake Engineering

SN - 1570-761X

IS - 1

ER -