The magnitude of an earthquake is a logarithmic measure of its
size. This means that for every whole number increase on the
scale, the amplitude of the shaking grows 10 times larger, and the energy released increases roughly 32 times.
For example, a magnitude 7.0 earthquake releases
about 1,000 times more energy than a magnitude 5.0 earthquake.
What Do The Numbers Mean?
2.5 or less: Usually not felt, but recorded by
seismographs.
2.5 to 5.4: Often felt, but typically causes
only minor damage.
5.5 to 6.0: Slight damage to buildings and other
structures.
6.1 to 6.9: May cause a lot of damage in very
populated areas.
7.0 to 7.9: Major earthquake. Serious damage.
8.0 or greater: Great earthquake. Can totally
destroy communities near the epicenter.
Safety: Drop, Cover, and Hold On
If you feel shaking, do not run outside. Most injuries occur
from falling debris.
1. DROP
Drop to your hands and knees. This prevents you from
being knocked over.
2. COVER
Cover your head and neck with your arms. Crawl under a
sturdy table if possible.
3. HOLD ON
Hold on to your shelter until the shaking stops.
Frequently Asked Questions
Can earthquakes be predicted?
▼
No. Neither the USGS nor any other scientists have ever
predicted a major earthquake. We can calculate probability (forecasts) over years, but we cannot predict the exact
time, date, or location of a quake.
What is the "Ring of Fire"?
▼
The Ring of Fire is a horseshoe-shaped belt around the
Pacific Ocean where about 90% of the world's earthquakes
occur. It is home to over 450 volcanoes and is defined
by the movement of several major tectonic plates.
Data source: USGS Public Feed • Map Image: Wikimedia Commons
(Equirectangular)
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