'seismic' = prone to earthquakes

'aseismic' = the absence of notable earthquakes

Please Refer Textbooks like Basics of Structural Dynamics & Aseismic Design by Damadaramoorthy & Kavitha

seismic: pertaining to, of the nature of, or caused by an earthquake orvibration of the earth, whether due to natural or artificial causes.

aseismic: free from earthquakes.

of Creep, of Creep, imp. & p. p. of Creep.

Yes, creep is a noun, as in "he was a creep". It can also be a verb, as in "he crept along".