Quantifying Holocene lithospheric subsidence rates underneath the Mississippi Delta
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چکیده
منابع مشابه
Causes of hot-spot wetland loss in the Mississippi delta plain
Field surveys and sediment cores were used to estimate marsh erosion and land subsidence at Madison Bay, a well-known wetland loss hot spot in coastal Louisiana. Former marshes of Madison Bay are under about 1 m of water. Nearly two-thirds of the permanent flooding was caused by rapid subsidence in the late 1960s, whereas the other third was caused by subsequent erosion. Subsidence rates near M...
متن کاملTectonic control of subsidence and southward displacement of southeast Louisiana with respect to stable North America
[1] GPS data collected between 1995 and 2006 suggest that southeast Louisiana, including New Orleans and the larger Mississippi Delta, are both subsiding vertically and moving southward with respect to stable North America. Both motions are likely related due to their common tectonic setting. Subsidence in the New Orleans area occurs in part because it is located in the hanging wall of a large ...
متن کاملPost-glacial sediment load and subsidence in coastal Louisiana
[1] Sea level rise in the Gulf ofMexico has occurred at a rate of 1.8–2.2 mm/yr during the 20th century, or nearly the same as observed globally due to combined steric and water mass changes. Tide gauges in coastal Louisiana, however, record a substantially larger rate of rise and while a number of causal mechanismsmay be responsible, their specific contribution is poorly understood. Using a re...
متن کاملEvaluating Land Subsidence Rates and Their Implications for Land Loss in the Lower Mississippi River Basin
High subsidence rates, along with eustatic sea-level change, sediment accumulation and shoreline erosion have led to widespread land loss and the deterioration of ecosystem health around the Lower Mississippi River Basin (LMRB). A proper evaluation of the spatial pattern of subsidence rates in the LMRB is the key to understanding the mechanisms of the submergence, estimating its potential impac...
متن کاملVulnerability of Louisiana's coastal wetlands to present-day rates of relative sea-level rise
Coastal Louisiana has lost about 5,000 km2 of wetlands over the past century and concern exists whether remaining wetlands will persist while facing some of the world's highest rates of relative sea-level rise (RSLR). Here we analyse an unprecedented data set derived from 274 rod surface-elevation table-marker horizon stations, to determine present-day surface-elevation change, vertical accreti...
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