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Thomas Augustus Jaggar, Jr. (January 24, 1871 – January 17, 1953) was an American volcanologist. He founded the Hawaiian Volcano Observatory and directed it from 1912 to 1940. ==Biography== He was born in Philadelphia, Pennsylvania in 1871, son of Episcopal Bishop of Southern Ohio Thomas Augustus Jaggar. In 1897, he received his Ph.D. in geology from Harvard University. He spent the next few years as a scientist in the laboratory. He felt strongly that experimentation was the key to understanding earth science. Jaggar constructed water flumes bedded by sand and gravel in order to understand stream erosion and melted rocks in furnaces to study the behavior of magmas. As he matured as a scientist, he began to feel the increasing need for field experimentation. Jaggar wrote at this time, "Whereas small scale experiments in the laboratory helped me to think about the details of nature...there remained the need to measure nature itself." Thus Jaggar began a decade-long period of exploration to witness and analyze first-hand natural geologic processes. In 1902, he was one of the scientists that the United States sent to investigate the volcanic disasters at Soufrière and Mont Pelée. With the help of the U.S. Navy and the National Geographic Society, Jaggar landed on the steaming shores of Martinique some 13 days after the disaster. The same year, he was elected a Fellow of the American Academy of Arts and Sciences.〔(【引用サイトリンク】url=http://www.amacad.org/publications/BookofMembers/ChapterJ.pdf )〕 In his autobiography published in 1956, Jaggar recounts, "It was hard to distinguish where the streets had been. Everything was buried under fallen walls of cobblestone and pink plaster and tiles, including 20,000 bodies....As I look back on the Martinique experience I know what a crucial point in my life it was....I realized that the killing of thousands of persons by subterranean machinery totally unknown to geologists...was worthy of a life work." In 1906 he became head of Massachusetts Institute of Technology's department of geology. The next 10 years of Jaggar's life brought expeditions to the scenes of great earthquakes and eruptions in Italy, the Aleutians, Central America, and Japan. With each trip, Jaggar became increasingly concerned that his field studies were but brief, inadequate snapshots of long-term, dynamic, earth processes. In 1908, an earthquake killed 125,000 people near Mt. Etna in Italy. With this disaster, Jaggar declared that "something must be done" to support systematic, ongoing studies of volcanic and seismic activity. He traveled to Hawaii in 1909 at his own expense, and determined that Kilauea was to be the home of the first American volcano observatory. He would work on that project the rest of his life. He married co-worker Isabel Maydwell in 1917. He moved to Honolulu in 1940 but remained active at the University of Hawaii. He died in Honolulu on January 17, 1953. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Thomas Jaggar」の詳細全文を読む スポンサード リンク
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