Variable-resolution building exposure modelling for earthquake and tsunami scenario-based risk assessment: an application case in Lima, Peru
<p>We propose the use of variable resolution boundaries based on central Voronoi tessellations (CVTs) to spatially aggregate building exposure models for risk assessment to various natural hazards. Such a framework is especially beneficial when the spatial distribution of the considered hazard...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2021-11-01
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| Series: | Natural Hazards and Earth System Sciences |
| Online Access: | https://nhess.copernicus.org/articles/21/3599/2021/nhess-21-3599-2021.pdf |
| _version_ | 1818852225458372608 |
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| author | J. C. Gomez-Zapata J. C. Gomez-Zapata N. Brinckmann S. Harig R. Zafrir R. Zafrir M. Pittore M. Pittore F. Cotton F. Cotton A. Babeyko |
| author_facet | J. C. Gomez-Zapata J. C. Gomez-Zapata N. Brinckmann S. Harig R. Zafrir R. Zafrir M. Pittore M. Pittore F. Cotton F. Cotton A. Babeyko |
| author_sort | J. C. Gomez-Zapata |
| collection | DOAJ |
| description | <p>We propose the use of variable resolution boundaries
based on central Voronoi tessellations (CVTs) to spatially aggregate building
exposure models for risk assessment to various natural hazards. Such a
framework is especially beneficial when the spatial distribution of the
considered hazards presents intensity measures with contrasting footprints
and spatial correlations, such as in coastal environments. This work avoids
the incorrect assumption that a single intensity value from hazards with low
spatial correlation (e.g. tsunami) can be considered to be representative
within large-sized geo-cells for physical vulnerability assessment, without,
at the same time, increasing the complexity of the overall model. We present
decoupled earthquake and tsunami scenario-based risk estimates for the
residential building stock of Lima (Peru). We observe that earthquake loss
models for far-field subduction sources are practically insensitive to the
exposure resolution. Conversely, tsunami loss models and associated
uncertainties depend on the spatial correlations of the hazard intensities
as well as on the resolution of the exposure models. We note that for the
portfolio located in the coastal area exposed to both perils in Lima, the
ground shaking dominates the losses for lower-magnitude earthquakes, whilst
tsunamis cause the most damage for larger-magnitude events. For the latter,
two sets of existing empirical flow depth fragility models are used,
resulting in large differences in the calculated losses. This study,
therefore, raises awareness about the uncertainties associated with the
selection of fragility models and spatial aggregation entities for exposure
modelling and loss mapping.</p> |
| first_indexed | 2024-12-19T07:17:32Z |
| format | Article |
| id | doaj.art-e388f63a595c47ee8df31db6c0e2721a |
| institution | Directory Open Access Journal |
| issn | 1561-8633 1684-9981 |
| language | English |
| last_indexed | 2024-12-19T07:17:32Z |
| publishDate | 2021-11-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Natural Hazards and Earth System Sciences |
| spelling | doaj.art-e388f63a595c47ee8df31db6c0e2721a2022-12-21T20:31:01ZengCopernicus PublicationsNatural Hazards and Earth System Sciences1561-86331684-99812021-11-01213599362810.5194/nhess-21-3599-2021Variable-resolution building exposure modelling for earthquake and tsunami scenario-based risk assessment: an application case in Lima, PeruJ. C. Gomez-Zapata0J. C. Gomez-Zapata1N. Brinckmann2S. Harig3R. Zafrir4R. Zafrir5M. Pittore6M. Pittore7F. Cotton8F. Cotton9A. Babeyko10Seismic Hazard and Risk Dynamics, GFZ German Research Centre for Geosciences, Potsdam, 14473, GermanyInstitute for Geosciences, University of Potsdam, Potsdam, 14469, GermanyeScience Centre, GFZ German Research Centre for Geosciences, 14473, Potsdam, GermanyAlfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI), Bremerhaven, 27570, GermanySeismic Hazard and Risk Dynamics, GFZ German Research Centre for Geosciences, Potsdam, 14473, GermanyHead Aerospace Group, Paris, 92250, FranceSeismic Hazard and Risk Dynamics, GFZ German Research Centre for Geosciences, Potsdam, 14473, GermanyInstitute for Earth Observation, EURAC Research, 39100, Bolzano, ItalySeismic Hazard and Risk Dynamics, GFZ German Research Centre for Geosciences, Potsdam, 14473, GermanyInstitute for Geosciences, University of Potsdam, Potsdam, 14469, GermanyGeodynamic Modelling, GFZ German Research Centre for Geosciences, Potsdam, 14473, Germany<p>We propose the use of variable resolution boundaries based on central Voronoi tessellations (CVTs) to spatially aggregate building exposure models for risk assessment to various natural hazards. Such a framework is especially beneficial when the spatial distribution of the considered hazards presents intensity measures with contrasting footprints and spatial correlations, such as in coastal environments. This work avoids the incorrect assumption that a single intensity value from hazards with low spatial correlation (e.g. tsunami) can be considered to be representative within large-sized geo-cells for physical vulnerability assessment, without, at the same time, increasing the complexity of the overall model. We present decoupled earthquake and tsunami scenario-based risk estimates for the residential building stock of Lima (Peru). We observe that earthquake loss models for far-field subduction sources are practically insensitive to the exposure resolution. Conversely, tsunami loss models and associated uncertainties depend on the spatial correlations of the hazard intensities as well as on the resolution of the exposure models. We note that for the portfolio located in the coastal area exposed to both perils in Lima, the ground shaking dominates the losses for lower-magnitude earthquakes, whilst tsunamis cause the most damage for larger-magnitude events. For the latter, two sets of existing empirical flow depth fragility models are used, resulting in large differences in the calculated losses. This study, therefore, raises awareness about the uncertainties associated with the selection of fragility models and spatial aggregation entities for exposure modelling and loss mapping.</p>https://nhess.copernicus.org/articles/21/3599/2021/nhess-21-3599-2021.pdf |
| spellingShingle | J. C. Gomez-Zapata J. C. Gomez-Zapata N. Brinckmann S. Harig R. Zafrir R. Zafrir M. Pittore M. Pittore F. Cotton F. Cotton A. Babeyko Variable-resolution building exposure modelling for earthquake and tsunami scenario-based risk assessment: an application case in Lima, Peru Natural Hazards and Earth System Sciences |
| title | Variable-resolution building exposure modelling for earthquake and tsunami scenario-based risk assessment: an application case in Lima, Peru |
| title_full | Variable-resolution building exposure modelling for earthquake and tsunami scenario-based risk assessment: an application case in Lima, Peru |
| title_fullStr | Variable-resolution building exposure modelling for earthquake and tsunami scenario-based risk assessment: an application case in Lima, Peru |
| title_full_unstemmed | Variable-resolution building exposure modelling for earthquake and tsunami scenario-based risk assessment: an application case in Lima, Peru |
| title_short | Variable-resolution building exposure modelling for earthquake and tsunami scenario-based risk assessment: an application case in Lima, Peru |
| title_sort | variable resolution building exposure modelling for earthquake and tsunami scenario based risk assessment an application case in lima peru |
| url | https://nhess.copernicus.org/articles/21/3599/2021/nhess-21-3599-2021.pdf |
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