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Accounting for uncertain fault geometry in earthquake source inversions – II: application to the Mw 6.2 Amatrice earthquake, central Italy
- Source :
- Geophysical Journal International, Geophysical Journal International, Oxford University Press (OUP), 2019, 218 (1), pp.689-707. ⟨10.1093/gji/ggz180⟩, Geophysical Journal International, 2019, 218 (1), pp.689-707. ⟨10.1093/gji/ggz180⟩
- Publication Year :
- 2019
- Publisher :
- Oxford University Press (OUP), 2019.
-
Abstract
- SUMMARY Our understanding of earthquake sources is limited by the availability and the quality of observations and the fidelity of our physical models. Uncertainties in our physical models will naturally bias our inferences of subsurface fault slip. These uncertainties will always persist to some level as we will never have a perfect knowledge of the Earth’s interior. The choice of the forward physics is thus ambiguous, with the frequent need to fix the value of several parameters such as crustal properties or fault geometry. Here, we explore the impact of uncertainties related to the choice of both fault geometry and elastic structure, as applied to the 2016 Mw 6.2 Amatrice earthquake, central Italy. This event, well instrumented and characterized by a relatively simple fault morphology, allows us to explore the role of uncertainty in basic fault parameters, such as fault dip and position. We show that introducing uncertainties in fault geometry in a static inversion reduces the sensitivity of inferred models to different geometric assumptions. Accounting for uncertainties thus helps infer more realistic and robust slip models. We also show that uncertainties in fault geometry and Earth’s elastic structure significantly impact estimated source models, particularly if near-fault observations are available.
- Subjects :
- Physical model
010504 meteorology & atmospheric sciences
business.industry
Inverse theory
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences
Inversion (meteorology)
Accounting
Geometry
Slip (materials science)
010502 geochemistry & geophysics
01 natural sciences
Physics::Geophysics
Geophysics
13. Climate action
Geochemistry and Petrology
Probability distribution
Fault slip
business
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 1365246X and 0956540X
- Volume :
- 218
- Database :
- OpenAIRE
- Journal :
- Geophysical Journal International
- Accession number :
- edsair.doi.dedup.....799267574e1ec6eacd3a80586e0a221a