The provisions contained in this appendix are not mandatory unless specifically referenced in the adopting ordinance.

    User note: Code change proposals to this appendix will be considered by the IBC – Structural CodeDevelopment Committee during the 2016 (Group B) Code Development Cycle. See explanation on page iv.


    M101.1 General.

    The purpose of this appendix is to provide tsunami regulatory criteria for those communities that have a tsunami hazard and have elected to develop and adopt a map of their tsunami hazard inundation zone.

    M101.2 Definitions.

    The following words and terms shall, for the purposes of this appendix, have the meanings shown herein. Refer to Chapter 2 of this code for general definitions.

    TSUNAMI HAZARD ZONE. The area vulnerable to being flooded or inundated by a design event tsunami as identified on a community’s Tsunami Hazard Zone Map.

    TSUNAMI HAZARD ZONE MAP. A map adopted by the community that designates the extent of inundation by a design event tsunami. This map shall be based on the tsunami inundation map that is developed and provided to a community by either the applicable state agency or the National Atmospheric and Oceanic Administration (NOAA) under the National Tsunami Hazard Mitigation Program, but shall be permitted to utilize a different probability or hazard level.

    M101.3 Establishment of tsunami hazard zone.

    Where applicable, if a community has adopted a Tsunami Hazard Zone Map, that map shall be used to establish a community’s tsunami hazard zone.

    M101.4 Construction within the tsunami hazard zone.

    Construction of structures designated Risk Categories III and IV as specified under Section 1604.5 shall be prohibited within a tsunami hazard zone.


    1. 1.A vertical evacuation tsunami refuge shall be permitted to be located in a tsunami hazard zone provided it is constructed in accordance with FEMA P646.

    2. 2.Community critical facilities shall be permitted to be located within the tsunami hazard zone when such a location is necessary to fulfill their function, providing suitable structural and emergency evacuation measures have been incorporated.


    FEMA P646—12Guidelines for Design of Structures for Vertical Evacuation from TsunamisM101.4