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Seismic site effects are related to the am … Seismic site effects are related to the amplification of seismic waves in superficial geological layers. The surface ground motion may be strongly amplified if the geological conditions are unfavorable (e.g. sediments). Therefore, the study of local site effects is an important part of the assessment of strong ground motions, seismic hazard and engineering seismology in general. Damage due to an earthquake may thus be aggravated as in the case of the 1985 Mexico City earthquake. For alluvial basins, we may shake a bowl of jelly to model the phenomenon at a small scale. This article defines site effects first, presents the 1985 Mexico City earthquake, describes the theoretical analysis of the phenomenon (through mechanical waves) and details several research results on seismic site effects in Caracas.esults on seismic site effects in Caracas.
, 場址效應（英語：Seismic site effects）是一種影響地震震度的因素 ，又稱盆地效應，當震源的地震波傳到地表時，因地表表面的地下介質（地盤）的軟硬程度而影響此地的震度大小。原本離震央越近震度就會越大，但地震波傳至沖積層地表時，因淺層地底下的介質，導致速度降低，引起地震波放大，不僅震幅加大，持續時間也延長。
, Les effets de site sismiques correspondent … Les effets de site sismiques correspondent à une amplification des ondes sismiques dans les couches géologiques proches de la surface de la Terre. Le mouvement du sol en surface peut être fortement amplifié lorsque des conditions géologiques défavorables sont réunies (e.g. sédiments). Les destructions dues à un séisme sont alors largement aggravées comme dans le cas du séisme de 1985 à Mexico. Dans le cas des bassins sédimentaires, on fait souvent l'analogie avec un bol de gelée que l'on agite. Cet article définit brièvement le phénomène, présente l'exemple du séisme de 1985 à Mexico, propose une analyse théorique du phénomène (via les ondes mécaniques) et détaille quelques résultats de recherche sur les effets de site sismiques à Caracas.ur les effets de site sismiques à Caracas.
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場址效應（英語：Seismic site effects）是一種影響地震震度的因素 ，又稱盆地效應，當震源的地震波傳到地表時，因地表表面的地下介質（地盤）的軟硬程度而影響此地的震度大小。原本離震央越近震度就會越大，但地震波傳至沖積層地表時，因淺層地底下的介質，導致速度降低，引起地震波放大，不僅震幅加大，持續時間也延長。
, Les effets de site sismiques correspondent … Les effets de site sismiques correspondent à une amplification des ondes sismiques dans les couches géologiques proches de la surface de la Terre. Le mouvement du sol en surface peut être fortement amplifié lorsque des conditions géologiques défavorables sont réunies (e.g. sédiments). Les destructions dues à un séisme sont alors largement aggravées comme dans le cas du séisme de 1985 à Mexico. Dans le cas des bassins sédimentaires, on fait souvent l'analogie avec un bol de gelée que l'on agite.logie avec un bol de gelée que l'on agite.
, Seismic site effects are related to the am … Seismic site effects are related to the amplification of seismic waves in superficial geological layers. The surface ground motion may be strongly amplified if the geological conditions are unfavorable (e.g. sediments). Therefore, the study of local site effects is an important part of the assessment of strong ground motions, seismic hazard and engineering seismology in general. Damage due to an earthquake may thus be aggravated as in the case of the 1985 Mexico City earthquake. For alluvial basins, we may shake a bowl of jelly to model the phenomenon at a small scale. to model the phenomenon at a small scale.
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Effets de site sismiques
, Seismic site effects
, 場址效應
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