Loss estimates per Neighborhood Unit, Cascadia Subduction Zone M 9.0 earthquake, dry conditions scenario, Clackamas, Multnomah, and Washington Counties, Oregon

Oregon Department of Geology and Mineral Industries 2018 Loss estimates per Neighborhood Unit, Cascadia Subduction Zone M 9.0 earthquake, dry conditions scenario, Clackamas, Multnomah, and Washington Counties, Oregon tabular digital data Oregon Department of Geology and Mineral Industries Open-File Report Open-File Report O-18-02 Portland, Oregon, USA Oregon Department of Geology and Mineral Industries http://www.oregongeology.org Oregon Department of Geology and Mineral Industries 2018 Earthquake regional impact analysis for Clackamas, Multnomah, and Washington Counties, Oregon file geodatabase Oregon Department of Geology and Mineral Industries Open-File Report Open-File Report O-18-02 Portland, Oregon, USA Oregon Department of Geology and Mineral Industries http://www.oregongeology.org/ Hazus-based loss estimates summarized per neighborhood unit, Cascadia Subduction Zone M 9.0 earthquake, dry conditions scenario for Clackamas, Multnomah, and Washington Counties, Oregon: building repair/replacement cost, building content loss, displaced population, casualties for a daytime and nighttime earthquake, debris tonnage, and number of buildings per Probability of Damage State, which can be used to determine the number of yellow-tagged and red-tagged buildings. Provide per-neighborhood unit Hazus-based loss estimates for a specific earthquake scenario. Estimates provide a quantitative basis when planning for a major earthquake, including in a mitigation, emergency planning, and economic resilience context. Tabular data is intended to be joined to the Neighborhood_Units feature class that accompanies this report. Intended to be joined to the Neighborhood_Units feature class layer distributed with this report. 2018 Complete None planned ISO 19115 Topic Category geoscientificinformation health structure Oregon Geospatial Enterprise Office Metadata Keyword Thesaurus earthquake risk earthquake hazard earthquake preparation Oregon Geospatial Enterprise Office Metadata Keyword Thesaurus Clackamas Multnomah Washington Oregon Geospatial Enterprise Office Metadata Keyword Thesaurus Building space Oregon Geospatial Enterprise Office Metadata Keyword Thesaurus None REPORT DATA: This product is for informational purposes and may not have been prepared for or be suitable for legal, engineering, or surveying purposes. Users of this information should review or consult the primary data and information sources to ascertain the usability of the information. This publication cannot substitute for site-specific investigations by qualified practitioners. Site-specific data may give results that differ from the results shown in the publication. See the accompanying text report for more details on the limitations of the methods and data used to prepare this publication. Oregon Department of Geology and Mineral Industries mailing and physical address

800 NE Oregon Street Suite 965

Portland Oregon 97232 USA 1 971 673 1555 1 971 673 1562 dogami-info@oregon.gov When contacting DOGAMI about this data set, please reference the data set title or other identifying information in your correspondence. DOGAMI publications can be downloaded from http://www.oregongeology.org John Bauer Oregon Department of Geology and Mineral Industries Geohazards Analyst jpeg image (.jpg) This work was funded on behalf of Regional Disaster Preparedness Organization with an Urban Area Security Initiative grant for the Portland Metropolitan Region. Unclassified Results in this table should be considered estimates. Uncertainty and inaccuracies are present within 1) the underlying building database; 2) in the geologic data provided to the Hazus model; 3) in the daytime and nighttime population data provided to the Hazus model; and 4) within the Hazus model itself. Errors may be present in the underlying building database, such as year of construction and building usage. Geologic data that are used directly in the Hazus model, and used in deriving the site ground motion supplied to the Hazus model, contain uncertainties, and may not accurately reflect the geotechnical aspects of a particular site. An actual earthquake may differ significantly in underlying bedrock ground motion than what we used to develop site ground motion data. Permanent resident population assignments to individual residential buildings, which is used as a basis for assigning the nighttime population quantities, were done on pro-rated per-square-footage basis, and does not account for factors such as varying household sizes, vacancies, and second homes. Daytime populations used Hazus-based assumptions regarding people-per-square-footage occupancies. Earthquakes may occur outside of the two temporal scenarios modeled, such as during the weekend, resulting in significantly more or less casualties. Building types are categorized into one of 36 Hazus-supported model building types, and (for this project), one of 4 seismic design level categories. Considerable structural and non-structural variability exist within buildings classified into any particular category. However, buildings within a particular category respond to ground shaking in a manner more similar than building in another category, and that response has been quantified based on past earthquakes impacting United States construction.However, we maintain the Hazus-derived results are a useful predictor of overall average response to an earthquake and earthquake-induced ground failure. From Pinter and others, 2016, ("Modeling residual flood risk behind levees, Upper Mississippi River, USA"): "Hazus-calculated damages are estimates appropriate for comparison and planning purposes, particularly when pooled among a group of structures. Individual home or business owners should instead use specific and detailed information for results applicable to a single structure." Probability of damage states summarization equals the total number of buildings within the neighborhood unit. All loss ratios are between 0 and 1. All neighborhood units are fully represented with tabular data. See Neighborhood_Units feature class metadata for a full description, as it was used as an overlay to generate the summary statistics in this table. not applicable Building data were run in the Hazus Advanced Earthquake Engineering Module (AEBM), using the generic building models provided by Hazus based on building type and seismic design level. Debris was manually calculated by DOGAMI using the methods specified in the Hazus Earthquake Technical Manual. Displaced Population was manually calculated by DOGAMI on a per-building basis by multiplying the permanent residents occupying the building with its individual PDsComplete (Probability of Damage State Complete), following the methods and advice given in the Hazus Earthquake Technical Manual. See accompanying report for possible limitations and underestimation of displaced population using that approach. Neighborhood_Units feature class, distributed with this report, was used as an overlay. Data were summarized at the neighborhood unit level, with all attributes, including the Probability of Damage States, being simple summaries of the individual building loss data. Total casualties attributes for daytime and nighttime scenarios were manually computed, being a simple summary of the individual casualty levels for the daytime and nighttime scenarios. Loss ratios were computed using the overall building or content loss in the neighborhood unit divided by the total building and content cost of the neighborhood unit. Loss ratios in the table are not an average of the individual building loss ratio average. Oregon Department of Geology and Mineral Industries mailing and physical address

800 NE Oregon Street Suite 965