isoseismic

or i·so·seis·mal

[ahy-suh-sahyz-mik, -sahys-]
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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

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British Dictionary definitions for isoseismal

isoseismal

adjective

of or relating to equal intensity of earthquake shock

noun

a line on a map connecting points at which earthquake shocks are of equal intensity
Systematic name: isoseismic
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012