Guam Hazard Mitigation Plan - Western States Seismic Policy Council

SECTIONFIVERisk Assessment• Terrorism• Transportation accident• Tropical cyclone• Tsunami• Wildland fireIn February 2008, the HMAC reviewed Table 5-2 and determined that no hazards needed to beremoved and no additional hazards should be added. However, this table has been revisited forthe 2011 Guam HMP update. When deciding whether to include additional hazards in the 2011Guam HMP, the HMAC thought it important not only to address hazards that have created majorissues to date, but also to include potential hazards (i.e., hazards that can be foreseen asbecoming issues in the future). The added hazards are non-seismic ground failure hazards(sinkholes), slope failure (non-seismic landslide, mudslide, and post-fire debris flow), andterrorism. Through additional discussion, the HMAC also decided to reclassify some subhazardsas major hazards. The following hazards were profiled in previous plans as subhazards, but areprofiled as major hazards in the 2011 Guam HMP: coastal erosion, flooding, high surf, saltspray, severe wind, and tsunami. Also, what was previously labeled as seismic hazard is nowtitled earthquake and includes surface fault rupture, liquefaction, and lateral spread.5.3 HAZARD PROFILESThe DMA 2000 profiling hazard requirements are shown below and addressed in the followingtext.DMA 2000 REQUIREMENTS – RISK ASSESSMENT – PROFILING HAZARDSProfiling HazardsRequirement § 201.4(c)(2)(i): [The State risk assessment shall include an overview of the] location of all naturalhazards that can affect the State, including information on previous occurrences of hazard events, as well as theprobability of future hazard events, using maps where appropriate.ElementA. Does the risk assessment identify the location (i.e., geographic area affected) of each natural hazardaddressed in the new or updated plan?B. Does the new or updated plan provide information on previous occurrences of each hazard addressed inthe plan?C. Does the new or updated plan include the probability of future events (i.e., chance of occurrence) for eachhazard addressed in the plan?Source: FEMA 2008.The hazards selected for profiling were analyzed in 2004–2005, updated in 2008, and are againupdated in 2011; each hazard was analyzed in a methodical manner based on the following fourcategories: nature, location, previous occurrences, and probability of future events.5-5