LYCOS RETRIEVER 
Volcanoes: Regions
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New Zealand's active volcanoes include Raoul Island (Kermadecs), the Auckland Volcanic Field, the large caldera volcanoes of Taupo and Okataina, and the active cones of Taranaki/Egmont, Ruapehu, Tongariro-Ngauruhoe and White Island. Particular attention is paid to the frequently active volcanoes (Ruapehu, Tongariro-Ngauruhoe and White Island). Local, regional and central government authorities, plus the aviation and tourism industries, media and the public, need to know if there are any changes to the volcanoes' behaviour. The overall activity is quantified by setting an alert level from 0 to 5 for each volcano. Responding agencies in New Zealand are notified whenever the alert level changes, and they use it to determine the type and scope of their responses. Volcano alert bulletins are issued whenever there is a significant change in volcanic activity in New Zealand.
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The alignment of the three shield volcanoes that make up the Tharsis [THAR-siss] Montes region is clearly evident in this view. They are named Ascraeus Mons (top right), Pavonis Mons (middle) and Arsia Mons (bottom). Olympus Mons can be seen in the upper left hand corner. The three volcanoes are each somewhat smaller than Olympus Mons, varying from 350 to 450 kilometers (220 to 280 miles) in horizontal extent and each rising about 15 kilometers (9 miles) above the surrounding plains. The Tharsis Montes are located on the crest of a broad uplift of the Martian crust so that their summits are at about the same elevation as the summit of Olympus Mons. The fractures southeast of Pavonis Mons are named Noctis Labyrinthus; this region merges with the enormous Vallis Marineris canyon system to the east.
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The cones of Nicaragua’s volcanoes rise off a flat coastal plain just above sea level. This uncommon attribute makes them remarkable to look at and more accessible than volcanoes in other regions.
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