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Newspaper
Cedar Rapids Gazette
Location
Cedar Rapids, Iowa, United States of America
Date
Feb 12, 1990
Page
8
An overview explains earth structure from crust to inner core and defines the focus and epicenter. It notes the Mercalli scale rates shaking from I to XII and describes how tsunamis form from underwater quakes with waves up to 100 feet and speeds near 600 mph.
Seismic waves travel from quake sources as the crust bends and snaps back. Seismographs measure these waves and produce zigzag traces showing events like the October 17 1989 quake, rated 7.1 on the Richter scale.
The Earth shakes and cracks release energy during quakes causing landslides and sand boils. Stay inside under sturdy furniture or archways and away from falling objects. outdoors move away from structures and wires and remain outside until shaking ends.
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