The main goal of this study is to understand the relationship between tectonic and geomorphic processes in Taiwan's Eastern Coastal Range. The Eastern Coastal Range exhibits variable uplift values within a fairly constant climate: a highly sought-after study condition for tectonic geomorphologists.  The eastern boundary has uplift rates ranging from 2 to 11 mm/yr as measured from radiocarbon dates on marine terraces. We are using InSAR to determine the pattern of uplift along the Longitudinal Valley Fault, which is the range's western boundary. InSAR will produce better spatial coverage of the present-day creeping and non-creeping sections of the fault, previously measured by GPS, leveling, and creepmeters. If the inland mountain uplands follow the corresponding boundary uplift rate pattern, then we can study similar geomorphic processes in neighboring drainage basins with considerable difference in vertical uplift rate.  Our ultimate goal is to quantify processes such as creep and mass-wasting on hillslopes and bedrock incision by streams and debris flows in drainage basins with variable uplift rates.