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STATE OF CALIFORNIA

California Geological SurveyEarthquake Zones of Required Investigation

Azusa Quadrangl e2014

THISMAP SHOWSBOTH ALQUIST-PRIOLO EARTHQUAKEFAULTZONES AND SEISMIC HAZARD ZONES ISSUED FOR THEAZUSA QUADRANGLE

MAP EXPLANATION

Univeral Transverse Mercator, Zone 11 North

NorthAmerican Datum 1927

CALIFORNIA GEOLOGICALSURVEY

JOHN G. PARRISH,PHD., STATEGEOLOGIST

STATE OF CALIFORNIA - EDMUND G. BROWN, JR., GOVERNOR

THE NATURALRESOURCESAGENCY- JOHN LAIRD,SECRETARY

DEPARTMENTOF CONSERVATION - MARK NECHODOM, DIRECTOR

EARTHQUAKE FAULTZONES AND SEISMIC HAZARD ZONES

AZUSA7.5 MINUTEQUADRANGLE

IMPORTANT

PLEASE NOTETHE FOLLOWING FOR ZONES SHOWN ON THISMAP

1) This map may not show allfaultsthat have the potential forsurface fault rupture,either within the EarthquakeFault Zones or outside their boundaries. Additionally, thismapmay not show allareas that have thepotential for liquefaction, landsliding, strongearthquakeground shaking or other earthquake and geologichazards. Also, a single

earthquakeca pableof causing liquefaction or triggering landsidefailure will notuniformly affect the entire areazo ned.

2) Faultsshown arethebasisfor establishing theboundariesof theEarthquakeFault Zones.

3) Theidenti fication and location of thesefaults are based on thebest availabledata. However, the quality of dataused isva ried. Traces have been depicted as

accurately as possibleat thismap scale.

4) Liquefaction zones may also contain areas susceptible to the effects ofe arthquake-induced landslides. Thissituationtypically exists at or near the toes ofexistinglandslides,downslope from rockfall or debris flow source areas, or adjacentto steep stream banks.

5) Landslide zones on thismap were determined, inpart, by adaptingmethods firstdeveloped by the U.S. Geological Survey (USGS). Landslide hazardm aps prepared byt heUSGStypicall y use experimental approaches toasse ss earthquake-induced and other typesof landslide hazards. Althoughasp ects of these new methodologies may be incorporatedinfutureCGSseismic hazard zonemaps,USGS maps should not be usedas substitutes forthese Official SEISMIC HAZARD ZONES maps.

6) USGSbasemap standards provide that 90percentof cultural features belocatedwithin40feet(horizontal accuracy) at thescaleofthis map. The identification and location of

liquefaction and earthquake-inducedlandslidezones are based on availabledata.However, thequality of datausedis varied. Thezone boundaries depictedhavebeendrawnas accurately as possibleat this scale.

7) Information on this map isnot sufficient to serve asa substitutefor the geologic andgeotechnical siteinvestigations required underChapters7. 5and 7.8 of Division 2of theCaliforniaPublic ResourcesCode.

8) Seismic HazardZones identifiedon this mapmay include developedlandwheredelineatedhazards have alreadyb een mitigated to city or county standards. Check with your local

building/planningdepartmentfor informationregarding the locationof suchmitigatedareas.

9) DISCLAIMER: The Stateof California andthe Department of Conservation makenorepresentationsor warranties regardingtheaccuracy of the datafrom which these maps werederived. Neither theState nor theDepartment shall be liable under any circumstances for anydirect, indirect, special,incidental or consequential damages with respect toany claim by any

user or any third party onaccountof or arising from theuseof this map.

ALQUIST-PRIOLO EARTHQUAKEFAULT ZONES

EarthquakeFault Zones(Preliminary Zones for Review)Zone boundariesare delineated as straight-line segmentsthat connect encircled turning

points; theboundaries definethezoneencompassing active faults that constitute apotential hazard to structures from surfacefaultingor fault creep suchthat avoidanceasdescribed in Public Resources CodeSection 2621.5(a) would bereq uired.

AREA NOT EVALUATED

FOR LANDSLIDES OR LIQUEFACTION

(SANDIMAS)

(BALDWIN PARK)

(ELM

ONTE

)

(GLENDORA)

(CRY

STALLA

KE)

(WATERMAN MTN.)

(CHILA

OFLA

T)

(MT.WILSON)

3415'

11800'

11800'

347'30"

11752'30"

347'30"

3415'

11752'30"

For information regarding the scope andrecommendedmethods to beusedin conductingtherequireds iteinv estigations refer toCGS Special Publication 42, AppendixC GuidelinesforEvaluating theHazardof SurfaceRupture,and CGS Special Publication 117A, Guidlelines

for Evaluating and MitigatingSeisimic Hazards inCaliforni a.For a general descriptionof theAPand Seism ic Hazards Mapping acts, the zonation programs, and related information,pleaserefer to the websiteat www.conservation.ca.gov/cgs/ .

fault ruptureandearthquake-triggeredgroundfailureas required bythe APEarthquake FaultZoningAct (Public Resources Code Sections 2621-2630) andthe Seismic Hazards MappingAct (Public Resources Code Sections 2690-2699.6). For information regarding thegeneral

approachandrecommended methods for preparingthesezones,see CaliforniaGeologicalSurvey (CGS) Special Publication 42, Fault-Rupture Hazard Zones in California ,andSpecialPublication 118, RecommendedCriteriafor Delineating SeismicHazardZones in California.

SEISMIC HAZARD ZONES

(Not consideredfor this Preliminary Review)

Liquefaction

Areas where historical occurrence of l iquefaction, or local ge ological,geotechnical andground water conditions indicatea potential for permanentground displacements such that mitigation as defined in Public Resources CodeSection 2693(c) would berequi red.

Earthquake-Induced LandslidesAreas where previous occurrence of landslide movement, or local topog raphic,geological, geotechnical andsubsurface water conditions indicate a potential forpermanent ground displacements suchthat mitigation as defined in PublicResources Code Section2693(c) would berequired.

Overlapping Liquefaction andEarthqu ake-Induced LandslidesAreas that lie within zones of required investigation for both liquefaction andearthquake-induced landslides.

www.conservation.ca.gov/cgs

California GeologicalSurveyGeologic Informationand Publications

801 KStreet, MS 14-34Sacramento,CA 95814-3532

CHILAO

FLAT

AZUSA

WATERMAN

MTN.

CRYSTAL

LAKE

GLENDORA

SAN

DIMAS

BALDWIN

PARK

EL

MONTE

MT.

WILSON

OVERLAPPINGZONES

Overlap of EarthquakeFault Zone and Liquefaction Zone

Overlap of EarthquakeFault Zone and Earthquake-Induced Landslide Zone

C19061906

??

Active Fault Traces

Faults consideredtohave beenactiveduring Holocene time and tohave potentialfor surfacerupture; solidline whereaccurately located, longdash whereapproximately

located, short dash where inferred, dotted whereconcealed; query (?) indicatesadditional uncertainty. Evidence ofhistoric offset indicatedby year of earthquake-associatedeventor C for displacementcausedbyfault creep.

For additional informationon faults in this maparea, the

rationale used for zoning, and additional referencescons ulted,re fer tounpublishedFaultEvaluationReports on file at regional offices of CGS.

PRELIMINARY REVIEW MAP

EARTHQUAKE FAULT ZONES

Delineated incompliance withChapter 7.5 Division2 of the CaliforniaPublic ResourcesCode

(Alquist-Priolo Earthquake Fault ZoningAct)

AZUSA QUADRANGLE

1 0 1 20.5 MILES

1 00 0 0 1 00 0 2 00 0 3 00 0 4 00 0 5 00 0 6 00 0 7 00 0 8 00 0 9 00 0 1 0 0 00 F EE T

1000 500 0 1000 2000METERS

1 0 1 20.5 KILOMETERS

Scale 1: 24000

Contour Interval 40Fee t

REFERENCES USED TOCOMPILEFAULT DATA

AZUSAQUADRANGLE

SEISMIC HAZARD ZONES

Delineated incompliance withChapter 7.8,Division2 of theCalifornia Public ResourcesCode

(SeismicHazards Mapping Act)

AZUSA QUADRANGLE

Released: March 25, 1999

OFFICIAL MAP

DATAAND METHOLODOLOGYUSED TODEVELOP

SEISMIC HAZARDS ZONES AREPRESENTED IN THE FOLLOWING:

Seismic Hazard ZoneReportof theAzusa7.5-minuteQuadrangle,Los Angeles County California:California Geological Survey,Seismic HazardZone Report 021.

http://gmw.consrv.ca.gov/shmp/download/quad/AZUSA/reports/azu_eval.pdf

For additional informationon seismic hazards inthis map area, the rationale usedfor zoning, and additional references consulted, refer to:

www.conservation.ca.gov/cgs/shzp/

Released: January 8, 2014To Be Superseded On Or About July 8, 2014

N

PRELIMINARY

EARTHQUAKE FAULT ZONES

FOR REVIEW PURPOSES ONLY

TO BE SUPERSEDED ON OR ABOUT

JULY 8, 2014