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Partitioned off-fault deformation in the 2016 Norcia earthquake captured by differential terrestrial laser scanning.

Wedmore, L.N.J. and Gregory, L.C. and McCaffrey, K.J.W. and Goodall, H. and Walters, R.J. (2019) 'Partitioned off-fault deformation in the 2016 Norcia earthquake captured by differential terrestrial laser scanning.', Geophysical research letters., 46 (6). 3199-3205.

Abstract

Field measurements of co‐seismic fault slip often differ from surface slip models derived from satellite geodesy. Quantifying these differences is challenging as many geodetic techniques inadequately image near‐fault deformation. We use an iterative closest point (ICP) algorithm to difference pre‐ and post‐earthquake terrestrial laser scanning (TLS) point clouds to reveal cm‐scale patterns of surface deformation caused by shallow fault slip in the 2016 Mw 6.6 Norcia (central Italy) earthquake. TLS offsets are constant along the fault and match average field measurements. 84% of vertical displacement occurs on a discrete fault zone, with 16% of deformation distributed across a narrow zone <4 m wide. In contrast, horizontal deformation is distributed over an 8 m wide zone with c. 50% of extension accommodated as off‐fault deformation (OFD). The cm‐scale observation of deformation shows that horizontal and vertical co‐seismic OFD is partitioned – in this case, OFD is dominated by horizontal deformation.

Item Type:Article
Full text:Publisher-imposed embargo
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1029/2018GL080858
Publisher statement:Wedmore, L.N.J., Gregory, L.C., McCaffrey, K.J.W., Goodall, H. & Walters, R.J. (2019). Partitioned off-fault deformation in the 2016 Norcia earthquake captured by differential terrestrial laser scanning. Geophysical Research Letters 46(6): 3199-3205. 10.1029/2018GL080858. To view the published open abstract, go to https://doi.org/ and enter the DOI.
Date accepted:21 February 2019
Date deposited:28 February 2019
Date of first online publication:27 February 2019
Date first made open access:27 August 2020

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