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Ashley River

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(a) Ashley River west of Colonial Dorchester (1 m digital elevation model [DEM]), with surficial units from Weems et al. (2014). Schults Lake is depicted in eighteenth‐century maps. Spot heights (m), of the stream in yellow italics and approximate swamp terrace elevations in white. The double arrow represents the 0.8 m uplift axis of the anticline associated with the P25 model. (b) Slots at each end of the foundation log at Fort Dorchester wharves engaged with shafts driven into bedrock to permit the loaded log to sit on shoreline marl (after Ruddy and Howard, 2017). (c) Enlarged view of the eastern expression of inferred Ashley Bluffs fault with 0.5 m contours, showing two inferred earth flows g and h, and locations of sections e and f shown in panel (d). (d) North–south sections through panel (c). The shaded uncertainties represent standard deviations from least‐squares fits to elevations ±15 m from each section.
Published: 10 January 2025
Figure 3. (a) Ashley River west of Colonial Dorchester (1 m digital elevation model [DEM]), with surficial units from Weems et al. (2014) . Schults Lake is depicted in eighteenth‐century maps. Spot heights (m), of the stream in yellow italics and approximate swamp terrace elevations in white
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(a) Seismic reflection profile C2 along the south side of the Ashley River showing the Co at the east edge of a small anticline, the Middleton fault (Mi), and the three faults forming the Magnolia fault zone (MFZ). White rectangle at the top of the profile shows the location of the GPR profile in part (f) of this figure. (b) Profile VT1 across the Co, showing the same small anticline as coincident profile C2 but with higher resolution. (c) Profile VT3 just north of the Ashley River showing the possible expression of the Co, including the steepening of basement reflectors at the fault. (d) Profile VT2 showing what could be a more subtle expression of the Co southwest of profile C2. (e) Profile SC4 showing a possible extension of the Co farther to the southwest of profile VT2, again at the east side of a subtle anticline. The profile may also show the southern extension of the Middleton fault, but the correlation is tenuous because the profile is far to the south of C2. The seismic profiles in (a–e) have 8× vertical exaggeration (v.e.). (f) GPR profile along Ashley River Road just south of the Ashley River, coincident with profile C2 and with the same kilometer marks. The strong reflector appears to show either tectonic (folds and faults) or erosional features, but identifying the cause of the changes in reflector depth is difficult. The three potential faults marked on the profile approximately coincide with those identified on seismic profile C2, but their expression is not clear on the GPR profile.
Published: 06 May 2022
Figure 10. (a) Seismic reflection profile C2 along the south side of the Ashley River showing the Co at the east edge of a small anticline, the Middleton fault (Mi), and the three faults forming the Magnolia fault zone (MFZ). White rectangle at the top of the profile shows the location of the GPR
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COCORP profile C2, along Ashley River Road (upper panel). The J and B reflections are indicated, along with the intersection with profile C3, near Middleton Place. Prominent dipping reflectors beneath the B reflections are apparent near the southeast end of the profile. The CMP numbering here can be mapped to vibrator point location number (VP) used by Schilt et al. (1983) through CMP=2VP. The scale bar indicates length along the actual (crooked) profile. Map view showing profile station locations (lower panel). The geographic coordinates of the first profile station (STA1) are listed in Table 2.
Published: 01 June 2010
Figure 3. COCORP profile C2, along Ashley River Road (upper panel). The J and B reflections are indicated, along with the intersection with profile C3, near Middleton Place. Prominent dipping reflectors beneath the B reflections are apparent near the southeast end of the profile. The CMP
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Gravel coast of northern Pegasus Bay. a) Ashley River with spit across the mouth. b) Braided, mixed gravel and sand Ashley River flowing into Pegasus Bay. The Ashley River remains braided almost until it enters the sea. Dominant longshore drift is to the north at this locality (toward base of photo (a) and towards top of photo (b); refer to Figure 7).
Published: 01 December 2003
Fig. 16. Gravel coast of northern Pegasus Bay. a) Ashley River with spit across the mouth. b) Braided, mixed gravel and sand Ashley River flowing into Pegasus Bay. The Ashley River remains braided almost until it enters the sea. Dominant longshore drift is to the north at this locality
Journal Article
Journal: Geology
Published: 01 December 1982
Geology (1982) 10 (12): 654–658.
... zones lying at different depths. The shallower zone, at 4 to 8 km depth and collinear with the Ashley River, is herein named the Ashley River seismogenic zone. The composite focal plane solution suggests reverse faulting on a steeply dipping northwest-striking fault with the southwest side upthrown...
Series: GSA Field Guides
Published: 21 March 2019
DOI: 10.1130/2019.0053(01)
EISBN: 9780813756530
... ABSTRACT A man-made deposit at Northbridge Park near Charleston, South Carolina, consists of phosphatic nodules, fossils, and mud dredged from the bottom of the Ashley River; nodules and fossils lay strewn across the banks of the river. This artificial deposit is likely representative...
Journal Article
Published: 01 January 2016
Journal of Paleontology (2016) 90 (1): 154–169.
... of an agorophiid recently collected from an underwater cliff face of the Ashley River, South Carolina, USA, is assigned to Agorophius pygmaeus . It derives from the base of the Ashley Formation (early Oligocene). The new specimen consists of most of the skull and periotics, which are well preserved and described...
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First thumbnail for: A new specimen of Agorophius pygmaeus (Agorophiida...
Second thumbnail for: A new specimen of Agorophius pygmaeus (Agorophiida...
Third thumbnail for: A new specimen of Agorophius pygmaeus (Agorophiida...
Journal Article
Published: 20 May 2024
Bulletin of the Seismological Society of America (2024) 114 (5): 2687–2712.
... focused a search for a causal fault in this region. Photogrammetric analysis reveals that the buckle was caused by transient contraction of <10 cm with no dextral offset. Our results further weaken the evidence for faulting in the swamps and forests south of the Ashley River in 1886, hitherto motivated...
FIGURES
First thumbnail for: Static and Dynamic Strain in the 1886 Charleston, ...
Second thumbnail for: Static and Dynamic Strain in the 1886 Charleston, ...
Third thumbnail for: Static and Dynamic Strain in the 1886 Charleston, ...
Journal Article
Published: 16 February 2016
Bulletin of the Seismological Society of America (2016) 106 (2): 364–372.
... and 15 km down‐dip. Many of the earthquakes are concentrated in the 2–6.5 km depth range, near shallow faults imaged on seismic‐reflection profiles adjacent to the Ashley River. Our hypocenter relocations of 228 earthquakes occurring in the period 1977–2005 are consistent with the results obtained from...
FIGURES
First thumbnail for: Modern Seismicity and the Fault Responsible for th...
Second thumbnail for: Modern Seismicity and the Fault Responsible for th...
Third thumbnail for: Modern Seismicity and the Fault Responsible for th...
Journal Article
Published: 01 September 2009
Seismological Research Letters (2009) 80 (5): 883–900.
... dipping Lincolnville and the SW dipping Charleston faults. The southernmost Sawmill Branch fault zone also shows evidence of left-lateral strike-slip motion. The ∼N55°W trending Ashley River fault lying between Middleton Place and the Magnolia Plantation appears to be currently inactive. The idea...
FIGURES
First thumbnail for: Finding Faults in the Charleston Area, South Carol...
Second thumbnail for: Finding Faults in the Charleston Area, South Carol...
Third thumbnail for: Finding Faults in the Charleston Area, South Carol...
Journal Article
Published: 01 October 2008
Bulletin of the Seismological Society of America (2008) 98 (5): 2533–2542.
... on State Route 61, across the Ashley River from line VT-3b, shows characteristics of the B units similar to line VT-3b. Just as on VT-3b, the brightest reflectors within the B beds on C-2 deepen toward the southeast, starting at a point south of Fort Dorchester, and reach maximum depth in the vicinity...
FIGURES
First thumbnail for: Mesozoic and Cenozoic Faulting Imaged at the Epice...
Second thumbnail for: Mesozoic and Cenozoic Faulting Imaged at the Epice...
Third thumbnail for: Mesozoic and Cenozoic Faulting Imaged at the Epice...
Journal Article
Published: 01 October 1993
Bulletin of the Seismological Society of America (1993) 83 (5): 1442–1466.
... to be associated with the Ashley River fault zone, which is not a planar feature, but is composed of short segments of varying strikes (N20°W to N70°W) and dips (40° to 70°SW). Eleven events were associated with strike-slip motion on NNE - SSW striking vertical faults and with thrust faulting on N - S oriented...
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Seismic reflection profiles crossing Gants fault (G) and its splays (G1 and G2) and the Co. (a) Profile SC6. (b) Profile SC2 that runs nearly parallel to Gants fault south of the Ashley River, but still showing a monocline at the location of the fault. (c) Profiles VT5 and VT3 displayed in their relative positions to show the ∼75 m drop in the base of ACP strata across the gap, within which we infer the main strand of Gants fault lies. (d) Profile C4 south of the Ashley River showing a subtle anticline on the north end that we infer next to Gants fault. (e) Merged profiles VT4 and VT3 just north of the Ashley River showing the monoclines we interpret to be associated with Gants fault and one of its splays as well as the Co a few kilometers to the east of Gants fault. Vertical exaggerations (v.e.) of the seismic profiles are 8×. (f) GPR profile showing reflector disruptions that may correspond to strands of Gants fault south of the Ashley River. The profile overlaps the western 1 km of seismic profile C2 and extends about 2.5 km farther northwest (kilometer marks correspond with those of profile C2).
Published: 06 May 2022
Figure 9. Seismic reflection profiles crossing Gants fault (G) and its splays (G1 and G2) and the Co. (a) Profile SC6. (b) Profile SC2 that runs nearly parallel to Gants fault south of the Ashley River, but still showing a monocline at the location of the fault. (c) Profiles VT5 and VT3 displayed
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Seismic profile COCORP 3 (C3) (upper panel). The J and B reflections are indicated. Note that the B reflections on the south side of the Ashley River are essentially flat-lying at approximately 1.1 sec, whereas they deepen southward from the northern end of the profile toward the Ashley River. We interpret this as evidence of down-to-the-southeast faulting, similar to that resolved on VT3. The scale bar indicates length along the actual (crooked) profile. Map view showing profile station locations (lower panel). The geographic coordinates of the first profile station (STA1) are listed in Table 2.
Published: 01 June 2010
Figure 4. Seismic profile COCORP 3 (C3) (upper panel). The J and B reflections are indicated. Note that the B reflections on the south side of the Ashley River are essentially flat-lying at approximately 1.1 sec, whereas they deepen southward from the northern end of the profile toward
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Contours show the total intensity magnetic anomaly (contour interval 100 nT, shading density proportional to magnetic intensity) from Daniels (2005) (upper panel). The inset map (upper right) shows the outline of the South Georgia rift at regional scale as a dashed line with cross hatching and the area of the magnetic anomaly map, outlined with small circles. Yellow, blue, and red filled circles show the station locations of the Virginia Tech (VT), USGS SC (SC), and COCORP (C) reflection profiles (respectively). Yellow triangles show the locations of wells that have penetrated through the Cretaceous and younger coastal plain sediments and into rocks of early Mesozoic age. A more detailed map of the study area near Summerville, South Carolina (lower panel). Open circles show earthquake epicenters (M&gt;2.0, 1977–2004) instrumentally located by the University of South Carolina seismic network (Southeastern U.S. Seismic Network Operators, see the Data and Resources section). Note that profiles VT1 and SC10 overlap part of profile C2 along Ashley River Road on the south side of the river. Profile C3 crosses the Ashley River near Middleton Place.
Published: 01 June 2010
seismic network (Southeastern U.S. Seismic Network Operators, see the Data and Resources section). Note that profiles VT1 and SC10 overlap part of profile C2 along Ashley River Road on the south side of the river. Profile C3 crosses the Ashley River near Middleton Place.
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▴ Comparison of the en echelon left-step offset between WF(N) and WF(S) and the incised reach of the Ashley River (reach 2). The gray patterned area in the offset between WF(N) and WF(S) is the expected area of uplift. Note that only a small part of the incised river reach and terraced valley coincides with the predicted uplift within the offset.
Published: 01 July 2011
Figure 3. ▴ Comparison of the en echelon left-step offset between WF(N) and WF(S) and the incised reach of the Ashley River (reach 2). The gray patterned area in the offset between WF(N) and WF(S) is the expected area of uplift. Note that only a small part of the incised river reach and terraced
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Possible expressions of the MFZ in anomalous river trends. Locations of each map are shown in Figure 7c as rectangles. (a) Anomalous Ashley River meander where the river crosses the MFZ and changes to a straighter course east of the fault. (b) Sharp bends in Foster Creek where it abruptly turns and appears to follow the inferred fault zone for about 2 km. (c) Northeast‐trending sections, bifurcations, and bends in the branches of Wallace Creek where they cross the inferred MFZ near Rantowles. White dashed ovals along the railroad show the approximate locations of track bends in 1886. (Map data: Google, DigitalGlobe).
Published: 06 May 2022
Figure 12. Possible expressions of the MFZ in anomalous river trends. Locations of each map are shown in Figure  7c as rectangles. (a) Anomalous Ashley River meander where the river crosses the MFZ and changes to a straighter course east of the fault. (b) Sharp bends in Foster Creek where
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▴ (A) Cross-section along CD (Figure 7) showing earthquakes with compressional first arrival at ΣCSU. Earthquakes located by using HypoDD and A and B quality hypocentral locations obtained with HYPOELLIPSE are shown by triangles and squares respectively. The colors are coordinated with their epicentral locations shown in Figure 9. Earthquakes associated with WF(N), green, lie to the north and west of the Ashley River, whereas those with WF(S), yellow, lie along the Ashley River and to the south. Earthquakes located using HypoDD have been translated 1.4 km to the northwest to compare with the absolute locations given by HYPOELLIPSE and supplementary data. The shaded area shows the interpreted location of basalt flows and intercalated sediments. The faults mapped in the basalt are shown as blue triangles. This and other complementary data suggest that the surface expression of the WF(S) is located at ∼(0, 0) km while the surface expression of WF(N) is located at ∼(6.3, 0) km. WF(S) dips about 50° to the northwest. The inferred location of both WF(S) and WF(N) at the surface is in agreement with corroborative data on the basalt flows (700 m depth) and surface geology (see companion paper). The dip of WF(N) is not well constrained. AB shows where the cross-section along AB intersects the present cross-section. (B) Resulting cross-section along EF after the removal of the seven earthquakes in Figure 12(A) that are included in Figure 13(A) (in green) to define the Lincolnville fault (LF).
Published: 01 September 2009
with their epicentral locations shown in Figure 9 . Earthquakes associated with WF(N), green, lie to the north and west of the Ashley River, whereas those with WF(S), yellow, lie along the Ashley River and to the south. Earthquakes located using HypoDD have been translated 1.4 km to the northwest to compare
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 Figure 14. Summation map showing areas of persistently upward tectonic motion (light gray), areas of persistently downward tectonic motion (darker gray), and known recently active tectonic features in the Charleston area. The meizoseismal area of the 1886 Charleston earthquake is delimited by dark gray dashed-and-dotted ellipse. The zone of river anomalies (ZRA) of Marple and Talwani (1993) is bounded by dashed lines. Locations of the Ashley River fault and Woodstock fault are from Talwani (2000), the location of the Summerville fault is from Weems et al. (1997a), and the location of the Charleston fault is estimated from Lennon (1986). The Adams Run fault is proposed here. Area of exceptionally dense and well-developed sand blows near Hollywood is indicated by asterisk. Large gray arrows show direction of principal stress
Published: 01 January 2002
gray dashed-and-dotted ellipse. The zone of river anomalies (ZRA) of Marple and Talwani (1993) is bounded by dashed lines. Locations of the Ashley River fault and Woodstock fault are from Talwani (2000) , the location of the Summerville fault is from Weems et al. (1997a) , and the location
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 Figure 15. Map from Dutton (1889) showing the distribution of liquefaction features (“craterlets”) produced during the 1886 Charleston earthquake. Earle Sloan's map (in Dutton, 1889) of isoseismal boundaries is superimposed (irregular gray dashed line). Starburst symbols represent the two epicenters located by Dutton and Sloan for the 1886 earthquake. The positions of the Charleston fault, Adams Run fault, Woodstock fault northern segment (WFN), Woodstock fault southern segment (WFS), Ashley River fault (ARF), and the Summerville fault (SF) are indicated. Lighter gray areas are regions that have shown persistently upward relative movement over the past 34 m.y
Published: 01 January 2002
epicenters located by Dutton and Sloan for the 1886 earthquake. The positions of the Charleston fault, Adams Run fault, Woodstock fault northern segment (WFN), Woodstock fault southern segment (WFS), Ashley River fault (ARF), and the Summerville fault (SF) are indicated. Lighter gray areas are regions