Fault size distribution analysis — an example from Kimmeridge Bay, Dorset, UK

Hunsdale, Robert; Sanderson, David J.

doi:10.1144/gsl.sp.1998.133.01.14

Cited by 5 publications

(6 citation statements)

References 20 publications

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“…However, relatively small‐scale fractures can form during later phases of tectonism [ de Joussineau and Aydin , ; Park et al , ]. A likely universal scaling behavior may exist in a multiscale fracture system [ Odling et al , ; Marrett et al , ; Bour et al , ; Du Bernard et al , ; Bertrand et al , ], whereas inconsistent scaling exponents separated by characteristic lengths can also occur [ Ouillon et al , ; Hunsdale and Sanderson , ; de Joussineau and Aydin , ; Putz‐Perrier and Sanderson , ; Davy et al , ]. A break in scaling may be caused by the different growth mechanisms of jointing and faulting [ Pollard and Segall , ; de Joussineau and Aydin , ], the influence of lithological layering [ Ouillon et al , ; Hunsdale and Sanderson , ; Odling et al , ; Putz‐Perrier and Sanderson , ], and the nature of driving forces (i.e., boundary or body forces) associated with distinct spatial organization of strains [ Bonnet et al , ; Davy et al , ].…”

Section: Discussionmentioning

confidence: 99%

Tectonic interpretation of the connectivity of a multiscale fracture system in limestone

Lei

Wang

2016

Geophysical Research Letters

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This paper studies the statistics and tectonism of a multiscale natural fracture system in limestone. The fracture network exhibits a self‐similar characteristic with a correlation between its power law length exponent a and fractal dimension D, i.e., a ≈ D + 1. Contradicting the scale‐invariant connectivity of idealized self‐similar systems, the percolation state of trace patterns mapped at different scales and localities of the study area varies significantly, from well to poorly connected. A tectonic interpretation based on a polyphase fracture network evolution history is proposed to explain this discrepancy. We present data to suggest that the driving force for fracture formation may be dissipated at the end of a tectonic event when the system becomes connected. However, the “effective” connectivity can successively be reduced by cementation of early fractures and reestablished by subsequent cracking, rendering a variable “apparent” connectivity that can be significantly above the percolation threshold.

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Section: Discussionmentioning

confidence: 99%

Tectonic interpretation of the connectivity of a multiscale fracture system in limestone

Lei

Wang

2016

Geophysical Research Letters

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“…Individual faults can be traced into the coastal region (Fig. 3) 247 where they form a conjugate set of normal faults with dips of 60-80º whose geometry and 248 displacement have been described in detail by Hunsdale and Sanderson (1998) (Fig. 1B).…”

Section: Kattenhorn and Pollard 2001) 239mentioning

confidence: 99%

Bathymetric mapping of the coastal and offshore geology and structure of the Jurassic Coast, Weymouth Bay, UK

Sanderson

Dix

Westhead

et al. 2017

JGS

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14Four hundred square kilometres of one metre binned, full coverage swath bathymetry data, 15 integrated with similar resolution onshore topography, has been used to generate a seamless 16 onshore to offshore bedrock map covering an extensive area adjacent to the "Jurassic Coast" 17 World Heritage site. Analysis of these data provides new insights into the structural development 18 of the Purbeck Monocline Cenozoic inversion structure, in particular, variations in the expression 19 of strain between the hanging wall block and the fault inversion zone. The footwall to the basin-20 pdf bounding faults compartmentalized deformation and uplift, and acted as a buttress to 21 compression. The data also show a lack of significant thickness changes within the major 22 lithostratigraphical divisions, and a notable absence of basin-related extensional faulting in the 23 offshore area that is in marked contrast to the more extensively studied onshore region. This 24Sanderson et al MS Click here to download Article text Sanderson Dix Westhead Collier MS.indicates that prior to inversion, the basin evolved by intermittent activity on a few major 25 extensional faults. This improved understanding of the development of the basin and inversion 26 structures results from our ability to integrate and quantitatively manipulate these high resolution 27 and spatially extensive offshore and onshore datasets. 28

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“…By running offshore survey lines in an east-west direction perpendicular to mean fault strike (Figure 1), orientational bias is negated, and true fault dip and displacement are represented on Chirp profiles. Collection of fault data in the onshore area was carried out using a scanline technique [La Pointe and Hudson, 1985] and applying a Terzaghi correction to compensate orientational bias [Hunsdale and Sanderson, 1998;after Peacock and Sanderson, 1994] . Offshore seismic lines were also acquired in a north-south direction (Figure 1) to link the main east-west lines and to allow the geology on coast-parallel lines to be tied directly to that onshore.…”

Section: Data Acquisition and Processingmentioning

confidence: 99%

“…Fault The last phase of tectonism took place in the Oligocene_Miocene and is represented by a conjugate, north-south striking extensional fault set [Hunsdale and Sanderson, 1998]. These are well developed along the Dorset coast and in the adjacent near-shore area (Figure 1) [Donoran and Stride, 1961].…”

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confidence: 99%

“…Reverse movements on preexisting major, east-west striking, normal faults at depth produced monoclinal and periclinal drape folds in Cretaceous strata at higher tectonic levels. Fault The last phase of tectonism took place in the Oligocene_Miocene and is represented by a conjugate, north-south striking extensional fault set [Hunsdale and Sanderson, 1998]. These are well developed along the Dorset coast and in the adjacent near-shore area (Figure 1) [Donoran and Stride, 1961].…”

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The use of high‐resolution seismic reflection profiles for fault analysis in the near‐shore environment, Weymouth Bay, Dorset, England, United Kingdom

Hunsdale¹,

Bull²,

Dix³

et al. 1998

J. Geophys. Res.

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Abstract. High-resolution seismic reflection profiles using a Chirp source image a north-south extensional fault set, which cuts rocks of Upper Jurassic age, cropping out on the seafloor of Weymouth Bay, Dorset, England, United Kingdom. The same fault set cuts rocks of similar age along the adjacent coast, and field mapping can be compared directly with the Chirp profiles. Survey lines were shot perpendicular to the fault strike to produce dip sections from which displacements could be measured. One hundred and fifty-three faults were picked on a 15 km line, yielding a fault density of-10 km -•, similar to that measured in the coastal section.Chirp-resolved fault displacements as small as 0.5 m and a maximum fault displacement of 221 m could be inferred from the data. Distribution analysis of offshore fault data indicated that fault displacement is power law with a well constrained exponent of-0.9. This value is consistent with the power law exponent estimate for fault displacement, over the scale range 2-8 m, onshore. Thus Chirp near-shore seismic reflection profiles can inf111 a data gap for fault size-frequency relationships that commonly occurs when combining data from outcrops/cores and conventional seismic reflection profiles.

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Fault size distribution analysis — an example from Kimmeridge Bay, Dorset, UK

Cited by 5 publications

References 20 publications

Tectonic interpretation of the connectivity of a multiscale fracture system in limestone

Tectonic interpretation of the connectivity of a multiscale fracture system in limestone

Bathymetric mapping of the coastal and offshore geology and structure of the Jurassic Coast, Weymouth Bay, UK

The use of high‐resolution seismic reflection profiles for fault analysis in the near‐shore environment, Weymouth Bay, Dorset, England, United Kingdom

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