Surcharge Seismic Coefficient

[ENGJP22]

Hi guys, I have the following question, when we are evaluating Seismic effects on earth pressure we calculate a KAE, but I have the doubt that if
a different coefficient than Ka must be use to calculate the pressure due to surcharge in this sceneario?

 

[EireChch]

Kae is the combined seismic and static earth pressure. It is not ka (active earth pressure)