isoseismic

or i·so·seis·mal

[ahy-suh-sahyz-mik, -sahys-]
adjective Geology.
  1. noting or pertaining to equal intensity of earthquake shock.
  2. noting or pertaining to an imaginary line on the earth's surface connecting points characterized by such intensity.
noun
  1. an isoseismic line.

Origin of isoseismic

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018