Crustal warping in coastal Maine

Anderson, Walter A.; Kelley, Joseph T.; Thompson, Woodrow B; Borns, Harold W.; Sanger, David; Smith, David C.; Tyler, David A.; Anderson, R. Scott; Bridges, Anne; Crossen, Kristine J.; Ladd, Jonathan W.; Andersen, Björn G.; Lee, Fitzhugh T.

doi:10.1130/0091-7613(1984)12<677:cwicm>2.0.co;2

Cited by 30 publications

(12 citation statements)

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“…In situ measurements of stress in this region suggest a greatest principal stress direction similar to that inferred from Triassic-Jurassic block faulting in the Gulf of Maine (Anderson et al, 1984). The coastline surrounding the Gulf of Maine and Bay of Fundy has been, and is, seismically active (Smith, 1966;Lepage and Johnson, 1983;Anderson et al, 1984). Stress release along these fault systems also may be causing crustal movement from Portland to New Brunswick.…”

Section: Geologic Influencementioning

confidence: 89%

“…The fairly constant rates of RSL rise in Maine are not reflected in geodetic leveling studies, which indicate that northeastern Maine is subsiding relative to southern Maine (Brown, 1978;Tyler and Ladd, 1980;Anderson et al, 1984). Anderson et al (1984) state that releveling data show Eastport to be subsiding by as much as 9 mm/yr.…”

Section: Geologic Influencementioning

confidence: 99%

“…Anderson et al (1984) suggest that this increase in rate of crustal movement may be related to a post-1940 increase in New England seismic activity (Shakal and Toksoz, 1977).…”

Section: Geologic Influencementioning

confidence: 99%

“…Anderson et al (1984) state that releveling data show Eastport to be subsiding by as much as 9 mm/yr. However, this rate, taken from Tyler and Ladd (1980), is the rate of movement at Eastport relative to Calais (~40 km northwest of Eastport), and therefore cannot be interpreted as an absolute rate.…”

Section: Geologic Influencementioning

confidence: 99%

“…(Hicks, 1972;Anderson et al, 1984). However, regional trends of RSL along the northeast coast of North America determined using the most recent…”

Section: Geologic Influencementioning

confidence: 99%

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Recent Relative Sea-Level Change in Eastern North America

Braatz¹,

Aubrey²

1987

Sea-Level Fluctuations and Coastal Evolution

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Eigenanalysis of tide-gauge records between 1920 and 1983 in eastern North America reveals highly variable spatial and temporal patterns of relative sea-level change. Auxiliary data from numerical modeling suggest that much of the long wavelength (thousands of km) spatial patterns of sea-level change are due to post-glacial isostatic adjustment of the land surface. Filtering the isostatic component from the rates of relative sea-level movement yields residual rates that fluctuate about a coastal mean of 1.0-1.5 mm/yr during this 64-year time interval. This mean rate is within the range of previous estimates of the mean rate of eustatic rise in sea level during the past century. Some residual fluctuations (wavelengths of tens to hundreds of km) correlate with tilts of the land surface revealed by geodetic leveling transects, and appear to be related to regional geology (i.e., basement structures and tectonic provinces in Florida, Georgia, the Carolinas, and the Chesapeake Bay area; fault reactivation in northern New England and the Maritime Provinces). These results suggest that tide-gauge data can be used to determine neo-tectonic movements along this coastline. Analysis of the temporal patterns of relative sea-level change reveals a gradual increase in the rate of rise centered at about 1934, which may be due to steric expansion of the ocean. Broad peaks in the spectrum of temporal sea-level fluctuations at 3-, 6-, and 20-year periodicities (significant at the 807% level) may be a reflection of oceanographic, atmospheric, and astronomical forcing.

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Section: Geologic Influencementioning

confidence: 89%

Section: Geologic Influencementioning

confidence: 99%

“…Anderson et al (1984) suggest that this increase in rate of crustal movement may be related to a post-1940 increase in New England seismic activity (Shakal and Toksoz, 1977).…”

Section: Geologic Influencementioning

confidence: 99%

Section: Geologic Influencementioning

confidence: 99%

“…(Hicks, 1972;Anderson et al, 1984). However, regional trends of RSL along the northeast coast of North America determined using the most recent…”

Section: Geologic Influencementioning

confidence: 99%

See 3 more Smart Citations

Recent Relative Sea-Level Change in Eastern North America

Braatz¹,

Aubrey²

1987

Sea-Level Fluctuations and Coastal Evolution

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Historical development of the saltmarsh at Wells, Maine

Jacobson

1988

Earth Surf Processes Landf

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Comparisons of maps and aerial photographs dating from the late 1700s to the present document the recent development of an 8 km2 saltmarsh that is situated behind a barrier spit in southern Maine. Tidal channels that were relatively narrow in 1794 became wider by 1872. The reduction of marsh bordering tidal channels is interpreted as evidence that marsh accretion could not keep pace with rising sea-level. This suggests that the rate of sea-level rise had increased, although a change in discharge or sediment load caused by extensive settlement and land clearance may also have been involved.Meander patterns of the tidal streams changed considerably throughout the time period covered by the maps, demonstrating that the streams of this marsh are more dynamic than some others that have been widely reported in the literature. These differences in stream dynamics are probably related to the differences in sedimentological structure of the marshes.Between 1872 and 1956 the barrier spit eroded on its inside (shoreward) edge, probably in response to the construction of riprapping and houses along the spit, and the subsequent reduction of overwash and aeolian transport of sediment.Modification of the tidal inlet and adjacent marsh during the 1960s, including jetty construction, dredging, and filling of portions of the marsh surface, affected the marsh only locally. One tidal stream has been migrating rapidly apparently in response to compaction of peat by dredge spoils and consequent local disruption of the marsh hydrology. Except for this migration, erosion of the marsh edge occurred immediately after the inlet modifications; planimetric changes in the marsh and its streams have been minor since then.

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Middle and Late Holocene Sea-Level Changes in Eastern Maine Reconstructed from Foraminiferal Saltmarsh Stratigraphy and AMS ¹⁴C Dates on Basal Peat

Gehrels¹

1999

Quat. res.

145

109

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A relative sea-level history is reconstructed for Machiasport, Maine, spanning the past 6000 calendar year and combining two different methods. The first method establishes the long-term (103 yr) trend of sea-level rise by dating the base of the Holocene saltmarsh peat overlying a Pleistocene substrate. The second method uses detailed analyses of the foraminiferal stratigraphy of two saltmarsh peat cores to quantify fluctuations superimposed on the long-term trend. The indicative meaning of the peat (the height at which the peat was deposited relative to mean tide level) is calculated by a transfer function based on vertical distributions of modern foraminiferal assemblages. The chronology is determined from AMS 14C dates on saltmarsh plant fragments embedded in the peat. The combination of the two different approaches produces a high-resolution, replicable sea-level record, which takes into account the autocompaction of the peat sequence. Long-term mean rates of sea-level rise, corrected for changes in tidal range, are 0.75 mm/yr between 6000 and 1500 cal yr B.P. and 0.43 mm/yr during the past 1500 year. The foraminiferal stratigraphy reveals several low-amplitude fluctuations during a relatively stable period between 1100 and 400 cal yr B.P., and a sea-level rise of 0.5 m during the past 300 year.

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Crustal warping in coastal Maine

Cited by 30 publications

References 0 publications

Recent Relative Sea-Level Change in Eastern North America

Recent Relative Sea-Level Change in Eastern North America

Historical development of the saltmarsh at Wells, Maine

Middle and Late Holocene Sea-Level Changes in Eastern Maine Reconstructed from Foraminiferal Saltmarsh Stratigraphy and AMS ¹⁴C Dates on Basal Peat

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Crustal warping in coastal Maine

Cited by 30 publications

References 0 publications

Recent Relative Sea-Level Change in Eastern North America

Recent Relative Sea-Level Change in Eastern North America

Historical development of the saltmarsh at Wells, Maine

Middle and Late Holocene Sea-Level Changes in Eastern Maine Reconstructed from Foraminiferal Saltmarsh Stratigraphy and AMS 14C Dates on Basal Peat

Contact Info

Product

Resources

About

Middle and Late Holocene Sea-Level Changes in Eastern Maine Reconstructed from Foraminiferal Saltmarsh Stratigraphy and AMS ¹⁴C Dates on Basal Peat