"Yes...these faults are moving slowly. Therefore, in tens of years, or maybe, five to ten years, walls are gonna be breaking, driveways would have damages, roads would be repaired time and again."
The Earth's surface is made up of a series of large plates, like pieces of a giantjig-saw puzzle. Fault lines occur from the constant movement of these plates.Dr Khan tells how he became interested in the faults of Houston.
"There was an Allison Recovery Project in that they wanted to make very accurate data. They acquired LIDAR data, laser data to create a best digital elevation models for flood control. When I looked at that data, we found amazing features, linear features. And when we compared that with older data, those are faults. So what we did with that data, we mapped those faults very precisely and now, we could avoid some of those areas where there are active faults and we could construct high rise buildings in areas where there are no faults."
Khan was assisted in his project by graduate student Richard Engelkemeir, whosays there are some 300-faults in the area. The more prominent faults have names.
"The two most extensive faults are the Longpoint Fault which runs to Kirkwood and Memorial, I-ten, Beltway-8 intersection. It keeps on running up past Longpoint and seems to end near 290. Another series of faults, there are several faults that have different names is the Addicks Fault System. It runs from Barker Reservoir west of Highway Six and south of I-ten all the way northwest to Bush Intercontinental Airport."
Faults can be found inside the loop, in Baytown, the Battleground Fault nearthe San Jacinto Monument and others in the southeast that are associated withsalt domes. The technology used by Engelkemier and Khan was also useful to the Harris County Flood Control District. Spokeswoman Heather Saucier.
"After Tropical Storm Allison in 2001 we partnered with FEMA and embarked upon a 32 million dollar study to produce brand new flood insurance rate maps or flood plains maps, as they're sometimes called, for Harris County. If we can better pinpoint our topography in the lay of the land, we can more accurately define our our flood plains."
Khan has now shifted his fault finding quest to Fort Bend County near theBrazos River.
"That could be a serious concern. If it breaks the levee, similarly, these faults also in the long run. If the repair work is not happening, they may cause some big damage, like damage to bayous or other places."
Pat Hernandez. KUHF- Houston Public Radio News.