Knowledge (XXG)

Fusakichi Omori

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alleged in a letter to the newspaper are unreferenced by any other sources, and Omori himself chose to forgive writing, "referring to some trouble I had with hoodlums in San Francisco. I was very glad to see that the people of Hawaii did not like to have me treated in that way, but then it did me no injury and I bear no malice. There are hoodlums in all countries. The people of California treated me extremely well and I am very much pleased with my trip."
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readings as well as observed effects to describe damage. Omori described the faulting in California as parallel to the strike of the fault caused by shear stresses on the plane of fracture. Omori seismographs were rapidly installed all over northern California, and a list of aftershocks to the San Francisco earthquake was compiled and published. Omori returned to Japan 4 August 1906 aboard the
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Omori studied the directions of the movement by studying tombstones south of San Francisco, and cracks in the walls of buildings including the St. James Hotel in San Jose. Correlating damage in Western and Japanese construction, Omori released the first scale of earthquake damage that used instrument
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to record experiments carried out at the Engineering college at the University of Tokyo to investigate the overturning and fracturing of brick and other columns by horizontally applied motion. For many years the modernization of Japan during the Meiji Restoration, through replacement of traditional
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cut the surface for at least 40 miles and that the north-east side had shifted relative to the other side a distance of one to two meters. Some areas had 18 to 20 foot high scarps, others looked like a linear mole had been at work. This earthquake provided an initial data set which, when correlated
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Omori became chair of seismology at the university and secretary of the Imperial Earthquake Investigation Committee following Sekya's death on 9 January 1896. He could read English, German, Italian and Japanese and maintained correspondence with many seismologists as well as writing papers in all
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racist stoning and slugging of random Japanese men, however contemporary sources indicate that one boy involved in the stoning of Dr. Omori worked for the Post Office as a messenger was fired by Postmaster Fisk of San Francisco when the Japanese Association of America protested. Other incidents
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site 74000292, added 24 July 1974. In 1912 Omori shipped to Hawaii two instruments, an Omori-type Horizontal Tromometer and a seismograph, to be placed on the specially built foundations. A year later, two more Bosch-Omori seismographs were donated to the HVO by the Massachusetts Institute of
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and with minor modifications by the J&A Bosch Company of Strassburg, the "Bosch-Omori Seismometer". Distributed worldwide, Bosch-Omori seismographs formed the backbone of the world seismographic network until after World War II. The last operating Bosch-Omori seismograph, now operating
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Omori conducted measurements of the three principal phases of earthquake motion originally described by Milne: the preliminary tremors, the main portion and the end portion, and visited areas after major earthquakes to ground verify the data collected by his instruments. Omori arrived in
201:, obtained by their measuring devices at the university. In 1886 Sekiya was made chair of seismology and secretary to the Imperial Earthquake Investigation Committee and by the time of his death a decade later, Japan had nearly 1000 seismological recording stations to study 335:
18 May at the head of an Imperial committee of architects and engineers including Professors Tatsutaro Nakamura and Toshikata ("Riki") Sano to study the aftermath of the San Francisco earthquake and to give a new seismograph to the
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Omori and his colleagues spent time in the city measuring damaged buildings and taking photographs. They were reportedly assaulted on more than one occasion. At least two authors state that Omori and colleagues were attacked on
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south to San Francisco by land. Along the way he noticed the reaction of ground, buildings and trees to the earthquake, noting that "even large redwoods trees were split by the shearing motion of the ground."
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establishing a Ferndale Seismographic Station that would support the installation of a Bosch-Omori Seismograph in Ferndale. The area is especially interesting due to its proximity to the
1174:"Mayor Makes Apology for Attack on Omori: Citizens of Eureka Are Aroused by Assault on Japanese Seismic Expert". Vol. 100, no. 38. San Francisco Call. 8 July 1906. p. 25. 928: 1391: 1185:"Discovered the Center of quake: Prof. Omori, Japanese Seismologist says he found it on coast between Point Reyes and Point Arena". Daily Humboldt Standard. 26 July 1906. 391:
as well as damage to local property and buildings. Leaving Ferndale, Omori continued a careful inventory of man-made and natural features as he followed the trace of the
1312: 974: 312:, Omori noted the large loss of life, perhaps 75,000 and said that of those 99 percent had died because their houses were not built to withstand earthquakes. 349: 282:
and the complete destruction of Meishan town. He ascribed the high number of casualties due to structure collapse of the dominant local building type:
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in 1893 to his death, Omori studied Japanese volcanos. He described several types of volcanic earthquakes from data obtained at regular eruptions of
376: 1122:"Fisk extends Omori Apology: Summarily dismisses boy who struck savant with a stone". Vol. 100, no. 15. San Francisco Call. 15 June 1906. 400: 1396: 1386: 1106: 1079: 877: 495: 462: 478: 1411: 208:
In 1891 Omori was appointed assistant to Sekiya and in 1893 lecturer on seismology at the Imperial University. In 1895, he was sent to
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on 4 October 1923. Shortly thereafter, he was diagnosed with a brain tumor and entered the university hospital where he received the
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light wooden structures resting on boulders, with red brick buildings and iron bridges, had been a major source of concern or Milne.
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The California earthquake of April 18, 1906 : report of the State Earthquake Investigation Commission, in two volumes and atlas
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Clancey, Gregory (2006). Earthquake Nation: The Cultural Politics of Japanese Seismicity. Berkeley: University of California Press.
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frequency decreases by approximately the reciprocal of time after the main shock, a mathematical formula now called "Omori's law".
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and president of the Japanese Imperial Earthquake Investigation Committee. Omori is also known for his observation describing the
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Nott P. A., Herbert Gustar L. K., John Milne, Father of Modern Seismology: Norbury Publications: Caxton House, Kent 1980, p. 89
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Worldwide, the two most common types of seismographs at the time, the Milne-type and Bosch-Omori seismographs recorded the
321: 996: 518: 474: 469:, Omori designed the foundations and seismograph emplacement for the Whitney Laboratory of Seismology, building 29 near 357: 404: 332: 154: 91: 302: 1133:"Japanese visitors meet disgraceful treatment". Vol. 100, no. 14. San Francisco Call. 14 June 1906. 301:
as the first to research the effects of earthquakes on man-made structures through implementing the usage of
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Lawson, Andrew Cowper (1861–1952); State Earthquake Investigation Commission California (19 October 1908).
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where on 6 July 1906 he was struck by a ruffian who mistook him for a non-union strikebreaking sailor in
925:"San Francisco Earthquake of April 18, 1906. Observed at Hongo, Tokyo with Omori's Horizontal Pendulum" 898:
Milne, John: Omori, F. Trans Seismological Society, Japan. Vol 13, Pt 1: Effects on Buildings pp. 43–83
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In person, and in his writings, Omori followed the visible land trace of the fault 150 miles south to
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Yokohama burning: the deadly 1923 earthquake and fire that helped forge the path to World War II
927:. John Milne Seismological Library Science Museum Wroughton Library and Archives. Archived from 356:
During the approximately 80 days spent in California, Omori traveled by steamer as far north as
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In fall 1923 Omori attended the Second Pan-Pacific Science Congress in Australia, where he and
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and Tokyo on 1 September 1923, killing about 140,000 and leaving 1.9 million people homeless.
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offshore. That seismograph continues to operate (now independently) and is exhibited at the
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Otani, Shunsuke (2006). "A Japanese View of the 1906 San Francisco Earthquake Disaster".
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Omori, Fusakichi (1907). "Preliminary Note of the Formosa Earthquake of March 17, 1906".
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Historical Survey of U.S. Seimograph Stations: Geological Survey Professional Paper 1096
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The Great Earthquake and Firestorms of 1906: How San Francisco nearly destroyed itself
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from the Imperial Court a few days before his death at age 55 on 8 November 1923.
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In 1899, Omori described his horizontal recording pendulum, later called an Omori
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and comparing experimental results with measurements during actual earthquakes.
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by a gang of men and youths who were later hailed by the local press for their
451: 384: 290: 263: 198: 186: 178: 158: 32: 859: 568: 1221:"Daily News". Vol. 100, no. 65. San Francisco Call. 4 August 1906. 447: 162: 1001:. San Francisco, California: A. M. Robertson. p. 371. OCLC# 559920402. 610: 253:
provinces were devastated by earthquakes; their fault lines were traced by
1196: 741:(2). Ferndale, California: The Ferndale Museum: 1, 3–8. March–April 2023. 503: 283: 1159:
Associated Press (7 July 1906). "Mistake Scientist for non-union man".
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until he left Japan in 1895, as well as Japanese colleagues including
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serving as professors at the Imperial University of Tokyo, especially
1074:. Berkeley, California: University of California Press. p. 448. 778: 753: 655: 257:(1856–1935), another professor at Imperial University. He found the 197:
Sekiya and Omori published the first clear record of a destructive
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walls loosely cemented with mud and overlaid by heavy roof beams.
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Seismic Experiments on the Fracturing and Overturning of Columns
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independently of the seismographic network, is exhibited at the
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Earthquake Nation: The Cultural Politics of Japanese Seismicity
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Journal of the College of Science, Imperial University of Tokyo
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Later, Omori, the University of California (Berkeley), and the
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Crane, Charles S. (10 July 1906). "San Francisco Hoodlumism".
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Omori, Fusakichi (1894). "On the aftershocks of earthquakes".
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Order of the Sacred Treasure from the Imperial Court of Japan
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Bulletin of the Imperial Earthquake Investigation Committee
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From one of his earliest papers describing the eruption of
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and the mayor of Eureka promptly apologized to Dr. Omori.
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Omori later continued this research and is recognized in
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Geological Society of Australia Earth Science Showcase
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which covered the former coast road and created a new
963:. Carnegie Institution of Washington, Publication 87. 1313:"E.F. Pigot – the priest who knew about earthquakes" 113: 105: 97: 87: 79: 63: 42: 23: 324:. Seismologists from around the world arrived in 591:Bulletin of the Seismological Society of America 367:Omori continued his observations south into the 1257:"Whitney Seismograph Vault #29 nomination form" 990: 988: 986: 984: 952: 950: 948: 946: 580: 578: 548: 546: 544: 542: 540: 538: 536: 534: 465:who was planning a volcanic observatory on the 173:Omori studied physics with the initial British 142: 1236:. United States Geological Survey HVO web site 624: 622: 620: 331:Omori left Tokyo 1 May by ship and arrived in 136: 587:"Fusakichi Omori and his work on Earthquakes" 450:eruption and the 12 January 1914 eruption of 8: 1101:. Berkeley: University of California Press. 631:"Obituary Prof. Fusakichi Omori (1868–1923)" 559:. Cambridge The University Press. pp.  973:: CS1 maint: numeric names: authors list ( 688:Trobada Tècnica Institut d'Estudis Catalans 498:observed a seismograph recording the major 220:briefly on his way home in September 1896. 289:Previously, in 1889 Omori had worked with 185:who in 1880 became the first professor of 31: 20: 1392:Academic staff of the University of Tokyo 777: 654: 846:. Shinsai Yobō Chōsakai (Japan): 53–69. 530: 401:United States Coast and Geodetic Survey 966: 496:Riverview College in Sydney, Australia 262:with other earthquakes, revealed that 494:, the director of the observatory at 477:, state historic site 10-52-5506 and 463:Massachusetts Institute of Technology 375:and noted a giant landslide south of 7: 1274:Apple, Russell A. (4 January 2005). 1261:National Register of Historic Places 728: 726: 479:National Register of Historic Places 147:, 30 October 1868 – 8 November 1923) 1354:. Simon and Schuster. p. 336. 1144:"Hawaii is Safe from Earthquakes". 153:, second chairman of seismology at 161:rate of earthquakes, now known as 14: 998:The California Earthquake of 1906 684:"History of Science in Barcelona" 216:for additional study and visited 276:17 March 1906 Meishan earthquake 245:Global earthquake investigations 1311:Branagan, David (9 June 2009). 1197:"Collections | Ferndale Museum" 553:Davison, Charles (1927). "11". 1348:Hammer, Joshua (August 2006). 1070:Fradkin, Philip (April 2006). 189:at Tokyo Imperial University. 1: 1397:1906 San Francisco earthquake 1163:. Vol. 33, no. 280. 509:Omori returned to Japan from 346:Mission Street, San Francisco 316:San Francisco earthquake 1906 1387:People from Fukui Prefecture 995:Jordan, David Starr (1907). 519:Order of the Sacred Treasure 475:Hawaiian Volcano Observatory 328:shortly after the disaster. 446:in central Japan, the 1910 358:Humboldt County, California 274:(Taiwan) shortly after the 143: 1428: 1412:University of Tokyo alumni 1255:Apple, Russell A. (1972). 733:"Saving the seismograph". 715:Poppe, Barbara B. (1979). 682:Societat Catalana (2003). 556:The Founders of Seismology 1095:Clancey, Gregory (2006). 585:Davison, Charles (1924). 405:Mendocino Triple Junction 155:Tokyo Imperial University 137: 92:Tokyo Imperial University 30: 1263:. National Park Service. 338:University of California 322:San Francisco earthquake 754:"Baron Dairoku Kikuchi" 310:1908 Messina earthquake 149:was a pioneer Japanese 1382:Japanese seismologists 1020:(2_suppl): S183–S205. 752:Koto, Bunjiro (1917). 629:Alden, Andrew (1924). 611:10.1785/BSSA0140040240 500:great Kantō earthquake 299:earthquake engineering 228:Recording seismographs 128: 817:earthquakes.bgs.ac.uk 126: 16:Japanese seismologist 819:. vol XI, Pl. II-XII 511:Melbourne, Australia 467:Big Island of Hawaii 373:Ferndale, California 109:pioneer seismologist 1026:2006EarSp..22..183O 770:1917Natur.100..227K 647:1924Natur.113..133D 603:1924BuSSA..14..240D 434:Volcanic seismicity 326:northern California 278:, later describing 249:On 28 October 1891 203:seismicity in Japan 1232:Apple, Russell A. 1201:ferndalemuseum.com 1161:Los Angeles Herald 1014:Earthquake Spectra 908:Omori, F. (1900). 473:, now part of the 362:Eureka, California 129: 1148:. 14 August 1906. 1108:978-0-520-24607-2 1081:978-0-520-24820-5 1034:10.1193/1.2185647 878:978-0-520-24607-2 764:(2508): 227–228. 393:San Andreas Fault 280:soil liquefaction 259:strike-slip fault 121: 120: 1419: 1366: 1365: 1345: 1339: 1338: 1336: 1334: 1329:on 25 March 2012 1328: 1322:. 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Index


Fukui, Japan
Tokyo Imperial University

seismologist
Tokyo Imperial University
aftershock
Omori's law
foreign advisors
John Milne
Seikei Sekiya
seismology
earthquake
seismicity in Japan
Germany
Italy
England
seismometer
Ferndale Museum
Mino and Owari
Bunjiro Koto
strike-slip fault
aftershock
Japanese Formosa
17 March 1906 Meishan earthquake
soil liquefaction
sun-dried brick
John Milne
earthquake engineering
shaking tables

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