[mahy-kruh-sahy-zuh m, -suh m]
- a feeble, recurrent vibration of the ground recorded by seismographs and believed to be due to an earthquake or a storm at sea.
Origin of microseism
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- a very slight tremor of the earth's surface, thought not to be caused by an earthquake
- A faint Earth tremor, unrelated to earthquakes, caused by natural phenomena, such as winds and strong ocean waves.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.