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On the Integrated Surface Uplift for Dip‐Slip Faults

Segall, Paul and Heimisson, Elías Rafn (2019) On the Integrated Surface Uplift for Dip‐Slip Faults. Bulletin of the Seismological Society of America, 109 (6). pp. 2738-2740. ISSN 0037-1106. doi:10.1785/0120190220.

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Interferometric Synthetic Aperture Radar observations often provide maps of vertical displacement that can be integrated to estimate an uplift volume. Relating this measure to source processes requires a model of the deformation. Bignami et al. (2019) argue that the negative uplift volume associated with the 2016 Amatrice–Norcia, central Italy, earthquake sequence requires a coseismic volume collapse of the hanging wall. Using results for dip‐slip dislocations in an elastic half‐space we show that V_(uplift)=(P/4)(1−2ν)sin(2δ) in which P is the seismic potency, ν is the Poisson’s ratio, and δ is the fault dip, consistent with an earlier result of Ward (1986). For reasonable estimates of net potency for the 2016 Amatrice–Norcia sequence, this simple formula yields uplift volume estimates close to that observed. We conclude that the data are completely consistent with elastic dislocation theory and do not require a volume collapse at depth.

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Additional Information:© 2019 Seismological Society of America. Manuscript received 29 August 2019; Published Online 12 November 2019. Data and Resources: This is a theoretical article and contains no data. The authors thank Bill Ellsworth for bringing this problem to our attention. The authors thank Richard Walters, Carlo Doglioni, and an anonymous reviewer for their comments.
Group:Seismological Laboratory
Issue or Number:6
Record Number:CaltechAUTHORS:20191112-100103142
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Official Citation:Paul Segall, Elías Rafn Heimisson; On the Integrated Surface Uplift for Dip‐Slip Faults. Bulletin of the Seismological Society of America ; 109 (6): 2738–2740. doi:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:99802
Deposited By: Tony Diaz
Deposited On:12 Nov 2019 21:24
Last Modified:16 Nov 2021 17:49

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