About This Item

Share This Item

The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract

DOI:10.1306/11051010026

Quantification of fold curvature and fracturing using terrestrial laser scanning

Mark A. Pearce,1 Richard R. Jones,2 Steven A. F. Smith,3 Kenneth J. W. McCaffrey4

1Geospatial Research Ltd., Department of Earth Sciences, University of Durham, Durham, DH1 3LE, United Kingdom; [email protected]
2Geospatial Research Ltd., Department of Earth Sciences, University of Durham, Durham, DH1 3LE, United Kingdom; [email protected]
3Istituto Nazionale di Geofisica e Vulcanologia (INGV), Via di Vigna Murata, 605, 00143 Roma, Italy; [email protected]
4Geospatial Research Ltd., Department of Earth Sciences, University of Durham, Durham, DH1 3LE, United Kingdom; present address: Department of Earth Sciences, University of Durham, Durham, DH1 3LE, United Kingdom; [email protected]

ABSTRACT

Terrestrial laser scanning is used to capture the geometry of three single folded bedding surfaces. The resulting light detection and ranging (LIDAR) point clouds are filtered and smoothed to enable meshing and calculation of principal curvatures. Fracture traces, picked from the LIDAR data, are used to calculate fracture densities. The rich data sets produced by this method provide statistically robust estimates of spatial variations in fracture density across the fold surface. The digital nature of the data also allows resampling to derive fracture parameters that are more traditionally measured manually from outcrops (e.g., one-dimensional line transects of fracture spacing). The fracture statistics derived from the LIDAR data are compared with the calculated principal and Gaussian curvatures of the surface to assess whether areas of extreme curvature correlate with high-fracture density. For the folds studied, all the fracture spacing distributions showed an exponential distribution, and no significant correlation between fracture density and surface curvature was observed. This questions the validity of using curvature as a proxy for high brittle strains and highlights the need for a complete understanding of fold and fracture mechanics that include considerations of other factors including lithology, strain rate, and confining pressure, not just finite strain. The three case studies also illustrate how terrestrial laser scanning can be used to gather detailed quantitative data sets on fracture and fold distributions from outcrop analogs.

Pay-Per-View Purchase Options

The article is available through a document delivery service. Explain these Purchase Options.

Protected Document: $10
Internal PDF Document: $14
Open PDF Document: $24

AAPG Member?

Please login with your Member username and password.

Members of AAPG receive access to the full AAPG Bulletin Archives as part of their membership. For more information, contact the AAPG Membership Department at [email protected].