£¤62

£¤62

§̈¦55

§̈¦40 §̈¦40

§̈¦55

§̈¦40

UV8

§̈¦55

§̈¦530

Melbourne

£¤64

£¤62

£¤70

£¤49

£¤167

£¤165

£¤67

£¤79

£¤63

£¤412

£¤65

£¤63B

£¤49B

£¤167

£¤49B

£¤63

£¤63

£¤63

£¤67

£¤67

£¤49

£¤49

£¤49

£¤49

£¤63

£¤165

£¤49B

£¤62

£¤63

£¤64B

£¤63

£¤70

£¤425

£¤70

£¤63

£¤64

£¤67

£¤67

£¤79

£¤64

£¤67

£¤63

£¤79

£¤63

£¤49

£¤49

£¤62

£¤67

£¤63

£¤63

£¤79B

£¤49

£¤165

£¤63

£¤70

Jonesboro

Paragould

Searcy

Marion

West Memphis

Blytheville

Pine Bluff

Gilmore

Beebe

Newport

Forrest City

Diaz

Wynne

Batesville

Clarkedale

WalnutRidge

Osceola

Oxford

Highland

Horseshoe Bend

Ward

Hardy

Etowah

Bay

Stuttgart

Piggott

Turrell

Brinkley

Hoxie

Carlisle

Earle

Keo

Lafe

Lake View

Marked Tree

Cushman

DeWitt

Concord

Colt

Judsonia

Viola

Grady

Bono

Coy

CherokeeVillage

Helena-West Helena

Pocahontas

Ash Flat

LonokeHazen

Trumann

Manila

Ozark Acres

Corning

Bald Knob

Salem

Parkin

Caldwell

Lynn

Marianna

Palestine

Wheatley

Sidney

Hughes

DesArc

Black Rock

Madison

Cave City

Jennette

Caraway

Augusta

Edmondson

Kensett

Lake City

Franklin

Dell

Ravenden

Mount Pleasant

Portia

England

Newark

Mc Crory

Harrisburg

Altheimer

Strawberry Gosnell

Leachville

Rector

Weiner

Marvell

Moro

Lepanto

Tuckerman

Tyronza

Reyno

Dyess

Wilson

Gillett

Austin

Oak Grove Heights

Rondo

Clarendon

Austin

OKean

Biscoe

Cabot

Biggers

Luxora

Maynard

Monette

Garner

Humphrey

Patterson

Beedeville

Evening Shade

Datto

Moorefield

Brookland

Imboden

Delaplaine

Bradford

Campbell Station

DeVallsBluff

Guion

Marmaduke

Lexa

Hunter

Holly Grove

Sulphur Rock

Burdette

Higginson

Fargo

Elaine

Cotton Plant

St. Charles

Alicia

McRae

Grubbs

Mammoth Springs

PeachOrchard

Minturn

Swifton

Widener

Smithville

Magness

KnobelRavendenSprings

Ulm

Keiser

Egypt

Letona

Cherry Valley

Pangburn

Cash

Almyra

Pleasant Plains

Griffithville

Roe

Aubrey

Hickory Ridge

SouthBend

Sedgwick

Joiner

Jericho

Pollard

Victoria

Tupelo

West Point

Black Oak

Fisher

Williford

Crawfordsville

McDougal

Sunset

Heber Springs

College City

Haynes

Weldon

St. Francis

Bassett

AllportHumnoke

Wabbaseka

Russell

Jackson-Port

Success

Nimmons

Greenway

Marie

Georgetown

Birdsong

Oil Trough

Sherrill

Powhatan

La Grange

WaldenburgAmagon

Horseshoe Lake

Anthonyville

Lee

White

Clay

Cross

Arkansas

Prairie

Sharp

Phillips

Poinsett

Lonoke

Izard

Mississippi

Monroe

Greene

Jackson

Fulton

Craighead

Randolph

Woodruff

Lawrence

Jefferson

Crittenden

St. Francis

Independence

Lincoln

Cleburne

Stone

DeshaCleveland

ArkansasMissouri

Illinois

Kentucky

Tennessee

NMSZ

Arkansas Department of Emergency Management (ADEM)has designated 34 counties (shaded in pink) as the NewMadrid seismic zone (NMSZ) catastrophic planning area.The New Madrid seismic zone (NMSZ) is shaded in purple.

(N

GH-EQ-SW-SAM-012

NEHRP Soil Classification Map of Northeast Arkansas

Revised: Scale:1 : 250,000 Jerry W. Clark

Compilation:

Scott M. AusbrooksErica Doerr

2008

Arkansas Geological SurveyBekki White, State Geologist and Director

About the MapScientific experiments have shown that seismic waves can amplify when passing through certain soil types. The amount of amplification of earthquake induced ground motions can be correlated to a soil’s shear wave velocity. Based on this relationship, a classification system has been developed through the National Earthquake Hazard Reduction Program (NEHRP). This system assigns a letter (A, B, C, D, E and F) to the upper 30 meters of a soil based on its average shear wave velocity, thickness and potential to liquefy. The Arkansas Geological Survey (AGS) has coordinated with other member Geological Surveys of the Central U.S. Earthquake Consortium (CUSEC) to produce NEHRP soil classification maps for each of the respective eight states surrounding the New Madrid seismic zone (NMSZ). These individual state maps were subsequently compiled into an improved regional NEHRP soil classification map for the Arkansas Department Emergency Management’s (ADEM) New Madrid seismic zone catastrophic planning initiative. This map was developed from existing geologic and surficial materials maps including the USGS I-2789: Map of Surficial Deposits in the Eastern and Central United States (Fullerton, D.S., et al, 2003), as well as available shear wave velocity and standard penetration (SPT) data. Soils were classified based on the NEHRP procedures as described in the International Building Code (IBC) with the exception of including high velocity bedrock (where present) when determining the average shear wave velocity of the soil column. Soil classifications obtained from this map may be incorporated into the Federal Emergency Management Agency’s (FEMA) HAZUS software for estimating potential losses from earthquakes. This map is for screening purposes only and is not intended to be a substitute for a site specific evaluation. Copies of this map are available from the Arkansas Geological Survey, Little Rock, Arkansas.

ReferencesBorcherdt, R.D., 1994, New developments in

estimating sites effects on ground motion, in Proceedings of Seminar on New Developments in Earthquake Ground Motion Estimation and Implications for Engineering Design Practice, Applied Technology Council 35-1, pp. 10-1 through 10-44.

Building Seismic Safety Council, 2004, NEHRP

recommended provisions for seismic regulations for new buildings and other structures, 2003 edition, Part 1 Provisions: Federal Emergency Management Agency, FEMA 450, 355 pp.

Fullerton, D.S., Bush, C.A. and Pennell, J.N.,

2003, Map of surficial deposits and materials in the Eastern and Central United States (east of 102° west longitude): U.S. Geological Survey, Geologic Investigations Series Map I–2789, 1 sheet, scale 1:2,500,000; pamphlet, 48 pp, http://pubs.usgs.gov/imap/i-2789/.

International Code Council, 2002, 2003

International Building Code, 686 pp.

Crowley's Ridge

Generalized Geologic Map of Arkansas

0 50 10025Miles

R 9 W R 8 W R 1 ER 1 WR 2 WR 3 WR 4 WR 5 WR 6 WR 7 WR 9 E

R 8 ER 7 ER 6 ER 5 ER 4 ER 3 ER 2 E

T21N

T20N

T19N

T18N

T17N

T16N

T15N

T14N

T13N

T12N

T11N

T10N

T9N

T8N

T7N

T6N

T5N

T4N

T3N

T2N

T1N

T1S

T2S

T3S

T4S

T5S

T6S

T7S

T8S

R 11 ER 10 ER 9 ER 8 ER 7 E R 13 ER 12 E

LegendQuaternary (Gravel, Sand, Silt, Clay and Loess)

Tertiary (Sand and Clay with minor amounts ofLimestone andLignite)Igneous (Syenite and Lamproite)

Cretaceous (Sand, Chalk, Clay and Marl withminor amounts of Limestone)Pennsylvanian (Shale and Sandstone)Mississippian (Limestone, Shale, Sandstoneand Chert)Silurian/Devonian (includes middle and upperdivision of Mississippian, Arkansas Novaculite)Silurian/Devonian (Limestone, Shale and Sandstone)Ordovician (Limestone, Dolostone, Sandstone and Chert)

Cambrian (includes portion of Lower OrdovicianCollier Shale)Water

10 0 10 20 30 40 505Miles

10 0 10 20 30 40 50 60 70 80 90 1005Kilometers

DisclaimerAlthough this map was compiled from digital data that was successfully processed on a computer system using ESRI ArcGIS 9.x software at the Arkansas Geological Survey (AGS), no warranty, expressed or implied, is made by the AGS regarding the unity of the data on any other system, nor shall the act of distribution constitute any such warranty. The AGS does not guarantee this map or digital data to be free of errors nor assume liability for interpretations made from this map or digital data, or decisions based thereon. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the Arkansas Geological Survey. The 5M Hillshade base used in the making of this map was acquired at the Spatial Analysis Laboratory, University of Arkansas, Monticello and some of the other Feature Class Data was acquired online at (www.geostor.arkansas.gov).

W

F

E

A

B

C

D

(ft/sec) (m/sec)

Hard Rock >5,000 > 1,500 0.8 ……….. …………

Outcrops of unweathered to slightly weathered bedrock of the Ozark Plateaus, Ouachita

Mountains and Arkansas River Valley

No

Rock 2,500-5,000

760-1,500 1.0 ………. ……….

Outcrops of weathered bedrock and unweathered shales of the Ozarks, Ouachita Mountains and Arkansas River Valley

Yes

Regolith, weathered shales, cemented gravels, hard

and/or stiff/very stiff soils1,200-2,500

360- 760 1.3 - 1.7 >50 2,000

Deeply weathered bedrock and residuum of perdominately

limestones and dolostones of the Ozark Plateaus

Yes

Sands, silts and/or stiff/very stiff clays, loess, gravels 600-1,200 180 -

360 1.5 - 2.4 15 - 50 1,000 -2,000

Most of the Cretaceous and Tertiary deposits of the Gulf

Coastal Plain; Quaternary loess and cemented gravels of the

Mississippi Embayment; Quaternary terrace deposits of

the Arkansas River Valley

Yes

Soil profile with more than 10 ft (3m) of soft clay defined as soil with Plasticity Index >

20, Water Content > 40 <600 <180 1.2 - 3.5 <15 <1,000

Localized Quaternary terraces and alluvium of the Mississippi

EmbaymentNo

Soils vulnerable to potential failure or collapse under seismic loading such as

liquefiable soils, quick and highly sensitive clays,

collapsible, weakly cemented soils ………… …………

Site Specific Investigation

should be conducted - can be

<1 to as high as 10X <15 <1,000

Most of the Quaternary terrace, alluvium deposits and sensitive materials that may fail during seismically induced events. Predominately found in large

river valleys and the Mississippi Embayment Yes

Water ………… ………… ………… ………. ……….. ………………. Yes

Average Shear

Strength (lbs/sq ft)

SOIL PROFILE SITE CLASSIFICATION FOR SEISMIC AMPLIFICATION

Unit on MapRemarks

Average Shear Wave Velocity

Soil Profile Type

General Site Profile Description

Possible Amount of Amplification Bedrock Ground

Motion

Standard Penetration Tests

(SPT) Average Blow Counts

PrioritySymbols

Primary Route

Secondary Route

Tertiary Route

Interstate

US Highways

State Highways

Gas Pipeline

Oil Pipeline

Product Pipeline

Incorporated Areas

£¤412

§̈¦40

Arkansas Highway and TransportationDepartment (AHTD) - New Madridseismic zone (NMSZ) - CatastrophicEarthquake Emergency Response Routes

UV8