Observation of seismic site effects
Seismic site response for surface structures
Article REF: C260 V1
Observation of seismic site effects
Seismic site response for surface structures

Authors : Emmanuel JAVELAUD, Jean-François SEMBLAT

Publication date: October 10, 2017, Review date: July 20, 2020 | Lire en français

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1. Observation of seismic site effects

The seismic wave generated by faults propagates through the earth's crust. It attenuates as it travels, particularly as its energy is spread over a larger surface area.

Depending on the configuration and physical nature of the surface medium, it can be locally modified: amplified or reduced (de-amplified) in amplitude, frequency and duration.

1.1 Physical phenomena

An earthquake corresponds to the sudden rupture of a fault, which can be more than 500 km long, over an area of more than 10,000 km 2 , and with a differential displacement along the fault of up to several meters.

Rupture along the fault leads to several physical phenomena that can be classified as follows...

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