Governmental Roles and Responsibilities Related to Underground Injection and Induced Seismicity - Induced Seismicity Potential in Energy Technologies - page 111

92° 90° 88°

86°

BOX 4.4 Continued

Champaign

40°

Decatur

Indianapolis

1909

ILLINOIS

Terre Haute

MISSOURI

Wabash Valley
seismic zone

Columbia

1987

INDIANA

St. Louis

1838

2008

1891
1968

2002

38°

1917

Evansville

1965

KENTUCKY

1895

Paducah

New Madrid

1812

Clarksville

seismic zone

1812

Nashville

36°

1865

ARKANSAS

Jonesboro

Jackson 1811

TENNESSEE

Memphis

Huntsville

Florence

Little Rock

MISSISSIPPI

Decatur

ALABAMA

34°

Figure 1 Study area in Arkansas with Guy-Greenbrier seismic activity. Seismic stations installed by the
Arkansas Geological Survey and the Center for Earthquake Research at the University of Memphis are
marked by black squares; injection wells are marked by red dots; seismic events between October 1, 2010,
and February 15, 2011, are marked by dark gray dots; and seismic events between February 16, 2011,
and March 8, 2011, are marked by white dots. Named faults penetrate to the Precambrian basement (faults
from AGS and AOGC). Right inset: First-motion focal mechanism for M 4.0 event on October 11, 2010, is
consistent with right-lateral strike slip on a northeast-oriented fault. Left inset shows the location of the New
Madrid Fault zone in northeastern Arkansas with historical earthquakes. SOURCE: Modified from Horton
(2012); see also earthquake.usgs.gov/earthquakes/eqarchives/poster/2011/20110228.php.

Box continues