The record for Mayotte until now was the magnitude 5.2 earthquake in 1993.

For example, the design-basis earthquake to be chosen for a facility depends on the likelihood and consequences of failure should a more severe earthquake occur during the time frame.

The probability of occurrence of the defined DBE is therefore equivalent to the probability of DBAs.

Calcuation of the seismic movement associated with a reference earthquake for a given site, taking the site effect into account.

A design-basis earthquake is often associated with a return period (in years), which is the inverse of the annual probability.

Structures, systems and components important to safety that are credited to withstand a design basis earthquake shall be identified and qualified accordingly.

The design shall ensure that no substantive damage to these SSCs will be caused by the failure of any other SSC under DBE conditions.

The design shall support the maintenance of full functionality following a DBE for all the parts of the containment system credited in the safety analysis.