Houston area is under the effect of the plate tectonic, the expansion, and the salt dome of Gulf of Mexico and thus there are a lot of fault systems in Houston area. Most of these faults are normal faults and near the Earth’s surface. These faults accumulate very little seismic energy to produce earthquake and they mostly creep to cause the destructive damages to the infrastructures, roads and pipe lines in the metropolitan area (Fig.1.). Some of them are still unknown because of the creeping kinematics and we don’t know it until there are some damages.

    This study will focus on the Long-Point Faults located in west Houston. This fault is considered to be longest and active in the region. In order to precisely monitor surface fault motions, a dense continuous GPS array with 11 permanent GPS stations were installed along the two sides of the Long-Point fault since 2013 (Fig.2and3). This study summaries 3-year GPS observations from the GPS array and processes daily GPS observations from 2013 to 2015.

    The ground motion in Houston area also involves the subsidence which is mainly caused by ground water withdrawal, sediments compaction and surface faulting. There is considerable uneven land subsidence (5-10 mm/year) occurring in the Long Point fault area. Groundwater-level data within the Long-Point Fault area will also be used to examine the relation between subsidence and groundwater-level change in the Chicot and Evangeline aquifers.

      The Terrestrial LiDAR Scan (TLS) data also will be included in this study to generate the DEM in this area, the data acusition in urban area is not easy to conduct and the point clouds data also shows a lot affects of the buildings and the artifacts structures.