Natural Hazards

, Volume 94, Issue 3, pp 1117–1139 | Cite as

Probabilistic Tsunami Hazard Assessment (PTHA) for resilience assessment of a coastal community

  • Hyoungsu ParkEmail author
  • Daniel T. Cox
  • Andre R. Barbosa
Original Paper


Probabilistic Tsunami Hazard Analysis (PTHA) can be used to evaluate and quantify tsunami hazards for planning of integrated community-level preparedness, including mitigation of casualties and dollar losses, and to study resilient solutions for coastal communities. PTHA can provide several outputs such as the intensity measures (IMs) of the hazard quantified as a function of the recurrence interval of a tsunami event. In this paper, PTHA is developed using a logic tree approach based on numerical modeling for tsunami generated along the Cascadia Subduction Zone. The PTHA is applied to a community on the US Pacific Northwest Coast located in Newport, Oregon. Results of the PTHA are provided for five IMs: inundation depth, flow speed, specific momentum flux, arrival time, and duration of inundation. The first three IMs are predictors of tsunami impact on the natural and built environment, and the last two are useful for tsunami evacuation and immediate response planning. Results for the five IMs are presented as annual exceedance probability for sites within the community along several transects with varying bathymetric and topographic features. Community-level characteristics of spatial distribution of each IM for three recurrence intervals (500, 1000, 2500 year) are provided. Results highlight the different pattern of IMs between land and river transects, and significant magnitude variation of IMs due to complex bathymetry and topographic conditions at the various recurrence intervals. IMs show relatively higher magnitudes near the coastline, at the low elevation regions, and at the harbor channel. In addition, results indicate a positive correlation between inundation depth and other IMs near the coastline, but a weaker correlation at inland locations. Values of the Froude number ranged 0.1–1.0 over the inland inundation area. In general, the results in this study highlight the spatial differences in IMs and suggest the need to include multiple IMs for resilience planning for a coastal community subjected to tsunami hazards.


Tsunami Hazard Intensity measures PTHA Resilience Coastal community 

List of symbols


Froude Number (–)


Gravitational acceleration (LT−2)


Flow (Inundation) depth (L)


Momentum flux (hV2) (L3T−2)


Moment magnitude (–)


Number of moment magnitude (–)


Number of peak locations (–)


Number of slip shapes (–)


Manning Number (LT−1)


Probability (–)


Arrival time exceeding 1 m flow depth (T)


Duration exceeding 1 m flow depth (T)


Mean recurrence period (T)


Time (years) (T)


Velocity (LT−1)


Weighting factor for peak location (–)


Weighting factor for slip shape (–)


Elevation from datum (L)


Value of (.) (–)


Mean annual rate of recurrence (–)



Funding for this study was provided as part of the cooperative agreement 70NAB15H044 between the National Institute of Standard and Technology (NIST) and Colorado State University. The content expressed in this paper are the views of the authors and do not necessarily represent the opinions of NIST or the U.S. Department of Commerce.


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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  1. 1.School of Civil and Construction EngineeringOregon State UniversityCorvallisUSA

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