2021
DOI: 10.2112/jcoastres-d-21-00015.1
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Coastal Subsidence Due to Faults: Insights from Elevation Profiles of Vehicular Bridges, Southeastern Louisiana, U.S.A.

Abstract: Normal faults are common geological structures in the Mississippi River Delta within the underlying thick Cenozoic sedimentary section. Some faults have been identified as active, have deformed artificial features in the past century, and are concurrent with Louisiana's massive loss of coastal wetlands. Subsidence due to vertical motion, or slip, on faults, however, is poorly understood spatially and over decadal to centennial timescales. Therefore, how faults contribute to subsidence and subsequent land loss … Show more

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Cited by 4 publications
(16 citation statements)
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“…Similarly, the subsidence rate of the Larose transect located seaward of the Lake Hatch Fault (−1.31 ± 0.41 mm/yr) is lower than that of the Raceland transect located landward of this fault (−1.71 ± 0.49 mm/yr). Despite uncertainty in the exact surface expression of faults in our study area, the lack of a seaward increase of subsidence suggests that faulting is producing at most only limited, local effects in the Mississippi Delta (e.g., Hopkins et al, 2021) and is not driving broad-scale subsidence in this part of the delta, consistent with the slow long-term rates of fault slip inferred by Frederick et al (2019).…”
Section: Stratigraphic Tectonic and Other Factorssupporting
confidence: 60%
“…Similarly, the subsidence rate of the Larose transect located seaward of the Lake Hatch Fault (−1.31 ± 0.41 mm/yr) is lower than that of the Raceland transect located landward of this fault (−1.71 ± 0.49 mm/yr). Despite uncertainty in the exact surface expression of faults in our study area, the lack of a seaward increase of subsidence suggests that faulting is producing at most only limited, local effects in the Mississippi Delta (e.g., Hopkins et al, 2021) and is not driving broad-scale subsidence in this part of the delta, consistent with the slow long-term rates of fault slip inferred by Frederick et al (2019).…”
Section: Stratigraphic Tectonic and Other Factorssupporting
confidence: 60%
“…The faults cut compacted Pleistocene strata reducing the number of variables contributing to ground subsidence. The study of Hopkins et al (2021) indicates that fault slip rates are within the range of detection of both LiDAR and InSAR.…”
Section: Introductionmentioning
confidence: 92%
“…Fault motion and subsidence near the Golden Meadow fault zone (GMFZ) have been related to hydrocarbon extraction (e.g., Chan & Zoback, 2007;Morton et al, 2002). There is visual evidence of building and road displacements along the BRF and other coastal faults with measured rate estimates of ∼3 mm/y (Hopkins et al, 2021;McCulloh, 2001). The BRF and DSF reactivated during the Pleistocene due to depositional loading (McCulloh & Heinrich, 2013).…”
Section: Introductionmentioning
confidence: 97%
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“…Faulting is another plausible driver of deep subsidence. For example, recent fault activity 50–80 km north of the superstation has been observed (Hopkins et al., 2022). However, studies of fault slip rates in coastal Louisiana over geologic time scales generally show low rates, typically <0.1 mm/yr (e.g., Frederick et al., 2019; Shen et al., 2017).…”
Section: Synthesis and Implicationsmentioning
confidence: 99%