listed above. Faulting is extensiveeast and southwestof Hobby Airport.Non-
developedportionsof the southeasternquadrantof Harris County which are
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-
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
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.