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Mapping Previous HitActiveNext Hit Previous HitFaultsNext Hit in the Previous HitHoustonNext Hit Previous HitAreaNext Hit using LIDAR Data*

By

R. Engelkemeir1

 

Search and Discovery Article #50034 (2006)

Posted July 15, 2006

 

*Adapted from poster presentation at AAPG Annual Convention, Previous HitHoustonNext Hit, Texas, April 9-12, 2006

 

Click to view slides in PDF format (4.6 mb).

 

Click to view posters in PDF format.

Poster 1 (8.3 mb)            Poster 2 (1.1 mb)           Poster 3 (2.5 mb)

 

1University of Previous HitHoustonNext Hit; currently Schlumberger, Previous HitHoustonNext Hit ([email protected])

 

Abstract 

Over 300 Previous HitactiveNext Hit Previous HitfaultsNext Hit intersect the earth's surface in the Previous HitHoustonNext Hit Metropolitan Previous HitareaNext Hit.  They cause damage to man-made structures such as roads, pipelines and buildings.  We used LIDAR DEM images from the 2002 Tropical Storm Allison Recovery Project (TSARP) to examine known Previous HitfaultsNext Hit and to search for others that may have been overlooked in previous studies. We used hill-shading as the primary visualization method for locating the Previous HitfaultsNext Hit.  Later we examined them in the field. At some locations fault deformation and associated damage were evident, while in other locations field expression of the fault was subtle and the presence of a fault was difficult to confirm.  In some areas we used refined grids, using both raw data and supplied DEM, to better define known Previous HitfaultsNext Hit and to identify previously unknown Previous HitfaultsNext Hit. 

Proper documentation of Previous HitactiveNext Hit surface Previous HitfaultsNext Hit is important so that developers can avoid building in the zone of disturbed ground along them.  In some cases developers and builders have taken steps to avoid construction on fault traces, often by leaving the land as an open greenbelt or as a storm water detention pond.  In other cases structures have been built unknowingly within fault hazard bands.

 

Selected Figures 

LIDAR DEM of Harris County, with LIDAR mapped Previous HitfaultsNext Hit and salt dome locations. 

Proposed model for Previous HitHoustonNext Hit Previous HitareaNext Hit Previous HitfaultsNext Hit, showing relationship to salt in subsurface. The Previous HitactiveNext Hit surface Previous HitfaultsNext Hit are shown as continuing downward into growth Previous HitfaultsNext Hit. The growth Previous HitfaultsNext Hit sole out in structures resulting from the withdrawal of salt. Some of the salt rises in salt domes downdip of the Previous HitfaultsTop. 

Long Point Fault at Bunker Hill. (a) LIDAR; (b) LIDAR hillshade; (c) profile along Bunker Hill; arrow shows location on DEM; (d) photo looking updip along profile in c. Note tilted sidewalk slabs along scarp face. 

This house on Morehead has had several foundation repair jobs over the years.

 

References 

Bird, Dale E., Kevin Burke, Stuart A. Hall, and John F. Casey, 2005, Gulf of Mexico tectonic history: Hotspot tracks, crustal boundaries, and early salt distribution: AAPG Bulletin, v. 89, p. 311-328.

Lowrie, A., R. Hamiter, M.A. Fogarty, T. Orsi, I. Lerche, 1996, Thermal and time-temperature index (TTI) patterns during geologic evolution of North and Central Gulf of Mexico: GCAGS Transactions, v. 46, p. 249-260.

Winker, Charles D., 1982, Cenozoic shelf margins, Northwestern Gulf of Mexico: GCAGS Transactions, v. 32, p. 427-448.