Earthquake Glossary - isoseismal (line)
isoseismal (line)
An isoseismal (line) is a contour or line on a map bounding points of equal intensity for a particular earthquake.

Isoseismal contours for New Madrid earthquake.
An isoseismal (line) is a contour or line on a map bounding points of equal intensity for a particular earthquake.

Isoseismal contours for New Madrid earthquake.