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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.
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noun
  1. an isoseismic line.
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Origin of isoseismic

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