LATEST EARTHQUAKES

http://earthquake.usgs.gov/

EARTHQUAKES IN THE USA

• Earthquakes are one of the most costly natural hazards faced by

the Nation,• A significant risk to 75 million

Americans in 39 Stateshttp://

pubs.usgs.gov/fs/2006/3016/2006-3016.pdf

EARTHQUAKES IN THE USA

• The largest recorded earthquake in the United States was a magnitude 9.2 that struck Prince William Sound, Alaska

on Good Friday, March 28, 1964

• Alaska is the most earthquake-prone state and one of the most seismically

active regions in the world. Alaska experiences a magnitude 7 earthquake

almost every year, and a magnitude 8 or greater earthquake on average every 14

years

• Florida and North Dakota have the smallest number of earthquakes

in the United States• Each year the southern California

area has about 10,000 earthquakes. Most of them are so

small that they are not felt. Only several hundred are greater than

magnitude 3.0, and only about 15-20 are greater than magnitude 4.0.

TODAY IN EQ HISTORY

http://

earthquake.usgs.gov/learning/today/year.php

Deaths in the United States from Earthquakes

http://earthquake.usgs.gov/eqcenter/eqarchives

/

EARTHQUAKES IN ILLINOIS

The historical record of earthquakes having epicenters in Illinois begins on January 8, 1795. Since then there has

been an EQ each year

• The largest ever recorded occurred on November 9, 1968, and measured magnitude 5.4 on the Richter scale.

• The last damaging earthquake in Illinois occurred on June 10, 1987, near Olney in southeast Illinois. This quake

measured 5.0 on the Richter scale

Seismic Hazard Map

Map Earthquakes In Illinois1795 - 2008

• http://www.isgs.uiuc.edu/research/earthquake-hazards/pdf-files/earthquakes-thru-08.pdf

ILLINOIS EQ HISTORY

• http://earthquake.usgs.gov/regional/states/illinois/history.php

Stronger EQ happen outside IL but still have an impact

• The New Madrid Seismic Zone

New Madrid Earthquakes 1811-1812

• 1811, December 16, Northeast Arkansas

Magnitude ~7.2 - 8.1• 1812, January 23, New Madrid, Missouri

Magnitude ~7.0 - 7.8 • 1812, February 7, New Madrid, Missouri

Magnitude ~7.4 - 8.0

• http://earthquake.usgs.gov/regional/states/events/1811-1812.php

POST THE FOLLOWING WEBSITES

• http://www.isgs.uiuc.edu/research/earthquake-hazards/earthquake-haz.shtml

• http://earthquake.usgs.gov/eqcenter/eqarchives/

• http://earthquake.usgs.gov/

ANY QUESTIONS?

EQ’s in IL

• 1909 Aurora, Illinois: Magnitude 5.1, Intensity VII

• 1968 Southern Illinois: Magnitude 5.4, Intensity VII

• 1987 Near Olney, Illinois: Magnitude 5.1

EQ’s in IL

• 2004 June 28: Magnitude 4.2http://earthquake.usgs.gov/eqcenter/eqinthenews/2004/uskgad/• 2006 January 2: Magnitude 3.6 http://earthquake.usgs.gov/eqcenter/eqinthenews/2006/ushkav/• 2008 April 18: Magnitude 5.4

http://earthquake.usgs.gov/eqcenter/eqinthenews/2008/us2008qza6/