Partitioned Off‐Fault Deformation in the 2016 Norcia Earthquake Captured by Differential Terrestrial Laser Scanning

Field measurements of coseismic 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 algorithm to difference preearthquake...

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Bibliographic Details
Published in:Geophysical research letters 2019-03, Vol.46 (6), p.3199-3205
Main Authors: Wedmore, L. N. J., Gregory, L. C., McCaffrey, K. J. W., Goodall, H., Walters, R. J.
Format: Article
Language:English
Subjects:
2016 Central Italy earthquake
Deformation
Deformation mechanisms
earthquake
Earthquake forecasting
Earthquake prediction
Earthquakes
Fault lines
Fault zones
Geodesy
Geological faults
Geological hazards
Ground motion
Horizontal motion
Iterative algorithms
Lasers
Mathematical models
Offsets
off‐fault deformation
Satellites
Scanning
Seismic activity
Seismic hazard
shallow slip deficit
Slip
Terrestrial environments
terrestrial laser scanning
Three dimensional models
Vertical motion
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Summary:Field measurements of coseismic 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 algorithm to difference preearthquake and postearthquake terrestrial laser scanning point clouds to reveal centimeter‐scale patterns of surface deformation caused by shallow fault slip in the 2016 Mw 6.6 Norcia (Central Italy) earthquake. Terrestrial laser scanning offsets are constant along the fault and match average field measurements. Eighty‐four percent of vertical displacement occurs on a discrete fault zone, with 16% of deformation distributed across a narrow zone
ISSN:0094-8276
1944-8007
DOI:10.1029/2018GL080858