When erupting, all volcanoes pose a degree of risk to people and infrastructure, however, the risks are not equivalent from one volcano to another because of differences in eruptive style and geographic location. Assessing the relative threats posed by U.S. volcanoes identifies which volcanoes warrant the greatest risk-mitigation efforts by the U.S. Geological Survey and its partners. This update of the volcano threat assessment of Ewert and others (2005) considers new research in order to determine which volcanic systems should be added or removed from the list of potentially active volcanoes, updates the scoring of active volcanoes, and updates the 24-factor hazard and exposure matrix used to create the threat ranking. The threat assessment places volcanoes into five threat categories: very low, low, moderate, high, and very high. Within all five threat categories there are changes in relative rankings of volcanoes, and in a few cases, volcanoes moved between categories owing to changes in our understanding of their hazard, unrest, and exposure factors. Scorings of hazard factors were updated for some volcanoes where new research has identified Holocene eruptive activity or clarified our understanding of Holocene eruptive history and the occurrence of particular hazards such as tephra fall or pyroclastic density currents. The most numerous scoring changes made in the threat matrix since 2005 have been made among the hazard factors, particularly those accounting for observed eruptive activity or unrest. The very low threat category underwent the greatest amount of change, dropping from 32 to 21 volcanoes, owing to better knowledge of the eruptive histories of those volcanoes. The list of 18 very high threat volcanoes determined by Ewert and others (2005) remains the same; 11 of the 18 volcanoes are located in Washington, Oregon, or California, where explosive and often snow-and ice-covered edifices can project hazards long distances to densely populated and highly developed areas. Five of the 18 very high threat volcanoes are in Alaska near important population centers, economic infrastructure, or below busy air traffic corridors. The remaining two very high threat volcanoes are on the Island of Hawaiʻi, where densely populated and highly developed areas now exist on the flanks of highly active volcanoes. The high-and moderate-threat categories are dominated by Alaskan volcanoes. In these categories the generally more active and more explosive volcanoes in Alaska can have a substantial effect on national and international aviation, and large eruptions from any of the moderate-to very-high-threat volcanoes could cause regional or national-scale disasters. This revised threat assessment includes 18 very high threat, 39 high threat, 49 moderate threat, 34 low threat, and 21 very low threat volcanoes. The total of 161 volcanoes is a decrease of 8 from the total reported by Ewert and others (2005). [GVP, Global Volcanism Program; VEI, volcanic explosivity index (eruption magnitude); *, approximate date; ?, unknown da...

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The therapeutic effects of music are being recognized increasingly in the field of rehabilitation medicine. More music therapists are being employed in physical medicine and rehabilitation centres, with the goal of using music therapy services to assist in the physical recovery and health maintenance of clients. In spite of the benefits of physical rehabilitation programs, client participation to their full potential is often not observed. Music encourages participation in exercises and activities. Music can ease the discomfort and difficulty associated with exercise and therapy activities, and help ensure consistent participation. One of the goals of the music therapist is to provide a means for the client to express him/herself in a musical activity. Music therapy and rehabilitation medicine are starting to find a common niche in working together with clients who have various neurological, orthopaedic, and paediatric conditions. Therapeutic application of music in rehabilitation contributes to the quality of life of individuals with disabilities. Combined goals could include improving strength, range of motion, balance, communication, and cognition. Continued efforts in clinical practice and research will build on the information already available to further define possible applications of music therapy in rehabilitation, and its outcome and benefits. Occupational therapists can use the therapeutic medium of music, and the services of the music therapy discipline, in assisting clients to maximize their functional independence in their daily occupational roles.