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Page 2

Faults cut

through residetial

ad

commercialareas

i

any

of

the

cities

listed above. Faulting is extensiveeast and southwestof Hobby Airport.Non-

developedportionsof the southeasternquadrantof Harris County which are

crssd

by falts

ar

in h

aes

of

t

lar

ak,

Fridsd-! str,

_

South Houston and Mykawa oil fields. The Mykawa oil field in particulr has

extensive faultingin both a northwesterlyand northeasterlydirection.

The map was producedusing a combinationof aerial photographyand ground-

level confirmationof the faults. The map shold be sed as a general guide to

the prevalenceof faultingnear any particularlocalityand it should not be

used in the absence of site-specificstudies.The map should be consideredto

be a minimum statementon faulting,and should be supplementedby more detailed

local studies wherever faultingmay pose a significanthazard to anticipated

land use, especiallyalong extensionsof mapped faults or in an area of exten-

sive faulting.

The high side of a fault is called the upthrownside. The physical feature

at the break is called a scarp. The low side is called the downthrow side.

Typical scarps in the southeasternHarris County area have heights of between

one and two feet. Fewer than five percent of the scarps are higher than three

feet.

Faults in the urban areas of the map's coverageare probably underrepresented

since only active and damaging faults are readily detected. Inactiveor slowly

moving faults, and all faults in newly developedareas where damage is not yet

severe may escape notice unless the scarp is of substantialheight or has not

been destroyed by landfillor excavationduring the development.

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