Long Point–Eureka Heights fault system

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The Long Point–Eureka Heights fault system is a system of geologic faults in Houston, Texas. It runs beneath the metropolitan area from the southwest to the northeast. The various faults are characterized as normal faults, meaning that the downthrown side is in the direction of the dip of the fault plane. This fault system as well as others located in nearby parts of Texas are believed to have formed millions of years ago during the formation of the Gulf of Mexico. No significant earthquakes have occurred on these faults in historic times, but slow movement has been observed.

Houston City in Texas, United States

Houston is the most populous city in the U.S. state of Texas and the fourth most populous city in the United States, with a census-estimated population of 2.312 million in 2017. It is the most populous city in the Southern United States and on the Gulf Coast of the United States. Located in Southeast Texas near Galveston Bay and the Gulf of Mexico, it is the seat of Harris County and the principal city of the Greater Houston metropolitan area, which is the fifth most populous metropolitan statistical area (MSA) in the United States and the second most populous in Texas after the Dallas-Fort Worth MSA. With a total area of 627 square miles (1,620 km2), Houston is the eighth most expansive city in the United States. It is the largest city in the United States by total area, whose government is similarly not consolidated with that of a county or borough. Though primarily in Harris County, small portions of the city extend into Fort Bend and Montgomery counties.

Gulf of Mexico An Atlantic Ocean basin extending into southern North America

The Gulf of Mexico is an ocean basin and a marginal sea of the Atlantic Ocean, largely surrounded by the North American continent. It is bounded on the northeast, north and northwest by the Gulf Coast of the United States, on the southwest and south by Mexico, and on the southeast by Cuba. The U.S. states of Texas, Louisiana, Mississippi, Alabama, and Florida border the Gulf on the north, which are often referred to as the "Third Coast", in comparison with the U.S. Atlantic and Pacific coasts.

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In geology, a fault is a planar fracture or discontinuity in a volume of rock, across which there has been significant displacement as a result of rock-mass movement. Large faults within the Earth's crust result from the action of plate tectonic forces, with the largest forming the boundaries between the plates, such as subduction zones or transform faults. Energy release associated with rapid movement on active faults is the cause of most earthquakes.

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U.S. Highway 175 (US 175) is an east-west United States highway completely within the state of Texas. It comes very close to meeting its "parent" route, US 75, but decommissioning and rerouting in downtown Dallas, Texas brings it a couple of miles short. Before the decommissioning of US 75 south of downtown Dallas in favor of Interstate 45, US 175 met its "parent" US 75. US 175's western terminus is in Dallas, Texas at Interstate 45. The highway's eastern terminus is in Jacksonville, Texas at an intersection with US 69.

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Mount Bonnell Hilltop and park in Austin, Texas

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National Register of Historic Places listings in Houston County, Texas Wikimedia list article

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Growth fault

Growth faults are syndepositional or syn-sedimentary extensional faults that initiate and evolve at the margins of continental plates. They extend parallel to passive margins that have high sediment supply. Their fault plane dips mostly toward the basin and has long-term continuous displacement. Figure one shows a growth fault with a concave upward fault plane that has high updip angle and flattened at its base into zone of detachment or décollement. This angle is continuously changing from nearly vertical in the updip area to nearly horizontal in the downdip area.

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