"In January 1987, the Hawaiian Volcano Observatory (HVO), located on the rim of Kïlauea Volcano, celebrated its 75th Anniversary. In honor of HVO's Diamond Jubilee, the U.S. Geological Survey (USGS) published Professional Paper 1350 (see list of Selected Readings, page 57), a comprehensive summary of the many studies on Hawaiian volcanism by USGS and other scientists through the mid-1980s. Drawing from the wealth of data contained in that volume, the USGS also published in 1987 the original edition of this general-interest booklet, focusing on selected aspects of the eruptive history, style, and products of two of Hawaii's active volcanoes, Kïlauea and Mauna Loa. This revised edition of the booklet--spurred by the approaching Centennial of HVO in January 2012--summarizes new information gained since the January 1983 onset of Kïlauea's Pu'u '�-'ö-Kupaianaha eruption, which has continued essentially non-stop through 2010 and shows no signs of letup. It also includes description of Kïlauea's summit activity within Halema'uma'u Crater, which began in mid-March 2008 and continues as of this writing (late 2010). This general-interest booklet is a companion to the one on Mount St. Helens Volcano first published in 1984 and revised in 1990 (see Selected Readings). Together, these publications illustrate the contrast between the two main types of volcanoes: shield volcanoes, such as those in Hawaii, which generally are nonexplosive; and composite volcanoes, such as Mount St. Helens in the Cascade Range, which are renowned for their explosive eruptions."
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