isoseismic

or i·so·seis·mal

[ ahy-suh-sahyz-mik, -sahys- ]
/ ˌaɪ səˈsaɪz mɪk, -ˈsaɪs- /

adjective Geology.

noting or pertaining to equal intensity of earthquake shock.
noting or pertaining to an imaginary line on the earth's surface connecting points characterized by such intensity.

noun

an isoseismic line.

Origin of isoseismic