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Chapter 8:Hazard Analysis—Lava and VOG <br /> 7;"N 16J`W 159"W 541W 154'W 152.:.* <br /> i <br /> Hawail (blg Island) <br /> Sulfur Dloxlde Mass(meMc tans) <br /> :: 15 3P <br /> Figure 8-4. Concentrations of SOz under prevailing winds in the Main Hawaiian Islands,April 30,200931 <br /> 8.1.2.1 The Chemistry of,' and Reactions Occurring in, Kilauea's Vog Plumes <br /> The vog plumes from Kilauea contain a variety of compounds, at varying concentrations, that <br /> could have adverse impacts on the downwind communities and environment. There are three <br /> primary sources of volcanic gases from Kilauea: Halema'uma'u, at the summit of Kilauea, <br /> the "TEB Vent", located on the upper Kilauea East Rift Zone (KERZ), and the ocean entry <br /> along the Puna shoreline. The compositions of each are generally different, and the <br /> compositions can vary depending on local and temporal conditions. <br /> 8.1.2.1.1 Halema'uma'u <br /> The Halema'uma'u discharge contains carbon dioxide (CO2), water vapor (H20), sulfur <br /> dioxide (S02), sulfur trioxide (S03) and smaller amounts of hydrogen sulfide (HzS), <br /> hydrochloric acid (HO), and hydrofluoric acid (HF), as well as a number of trace gases. <br /> Although most of the gases discharged are the result of degassing of magma(within or below <br /> 35 Image taken from National Aeronautics and Space Administration(NASA)Earth Observatory Website, <br /> Retrieved on October 12,2009 from http://earthobservatory.nasa.gov/IOTD/view.php?id=8800 <br /> 36 Image taken from National Aeronautics and Space Administration(NASA)Earth Observatory Website, <br /> Retrieved on October 12,2009 from http://eartliobservatoty.nasa.gov/IOTD/view.php?id=8706 <br /> 8-4 Hawaii County Multi-Hazard Mitigation Plan <br />