International Aspects of the History of Earthquake Engineering

Total Page:16

File Type:pdf, Size:1020Kb

International Aspects of the History of Earthquake Engineering International Aspects Of the History of Earthquake Engineering Part I February 12, 2008 Draft Robert Reitherman Executive Director Consortium of Universities for Research in Earthquake Engineering This draft contains Part I: Acknowledgements Chapter 1: Introduction Chapter 2: Japan The planned contents of Part II are chapters 3 through 6 on China, India, Italy, and Turkey. Oakland, California 1 Table of Contents Acknowledgments .......................................................................................................................i Chapter 1 Introduction ................................................................................................................1 “Earthquake Engineering”.......................................................................................................1 “International” ........................................................................................................................3 Why Study the History of Earthquake Engineering?................................................................4 Earthquake Engineering History is Fascinating .......................................................................5 A Reminder of the Value of Thinking .....................................................................................6 Engineering Can Be Narrow, History is Broad ........................................................................6 Respect: Giving Credit Where Credit Is Due ..........................................................................7 The Importance of Individuals As Well As Trends..................................................................8 History Makes One Think About the Future............................................................................9 Chronology Tables................................................................................................................10 General Historical Context ........................................................................................10 Earthquake Engineering.............................................................................................11 Earthquakes...............................................................................................................11 Chronology and History, Kinematics and Dynamics .............................................................11 Why Only the Selected Countries?........................................................................................12 Why the Emphasis on the Early Years?.................................................................................15 The End of (Earthquake Engineering) History? .....................................................................17 Chapter 2 Japan ........................................................................................................................22 1850 – 1900 ..........................................................................................................................26 General Historical Context: 1850-1900 .............................................................................26 The University of Tokyo ...............................................................................................29 Earthquake Engineering: 1850-1900..................................................................................30 William Edward Ayrton ................................................................................................31 John Perry .....................................................................................................................31 James Alfred Ewing ......................................................................................................32 Cargill Gilston Knott.....................................................................................................32 Thomas Lomar Gray .....................................................................................................33 Thomas Corwin Mendenhall .........................................................................................33 John Milne ....................................................................................................................33 Development of Seismographs ......................................................................................36 Seikei Sekiya.................................................................................................................38 Fusakichi Omori............................................................................................................39 Akitsune Imamura.........................................................................................................42 Bunjiro Koto .................................................................................................................43 Dairoku Kikuchi............................................................................................................45 Engineering and Construction Technology Context .......................................................45 Rise of Big Five Architecture-Engineering-Construction Firms.....................................49 Summary of the Contribution of Key Individuals ..........................................................50 Earthquakes: 1850-1900....................................................................................................51 2 1855 Tokyo Earthquake.................................................................................................52 1880 Yokohama Earthquake..........................................................................................52 1891 Mino-Owari Earthquake .......................................................................................53 1896 Sanriku Earthquake...............................................................................................53 Chronology Tables: 1850-1900 .........................................................................................55 1900-1950.............................................................................................................................56 1900-1950: General Historical Context .............................................................................56 Earthquake Engineering: 1900-1950..................................................................................60 Riki Sano ......................................................................................................................62 Tachu Naito...................................................................................................................71 Kyoji Suyehiro ..............................................................................................................79 Earthquakes: 1900-1950....................................................................................................82 1923 Kanto Earthquake .................................................................................................83 Chronology Tables: 1900-1950 .........................................................................................87 1950-2000.............................................................................................................................88 General Historical Context: 1950-2000 .............................................................................88 Earthquake Engineering: 1950-2000..................................................................................90 Kiyoshi Muto ................................................................................................................90 Building Research Institute............................................................................................95 Public Works Research Institute....................................................................................96 International Institute of Seismology and Earthquake Engineering ................................97 Professional Associations ..............................................................................................97 Construction Trends ......................................................................................................98 Advanced Seismic Technologies and Products ..............................................................99 Earthquake Loss Estimation ........................................................................................101 Earthquake Prediction .................................................................................................103 Earth Science and the Plate Tectonics Revolution........................................................105 Earthquakes: 1950-2000..................................................................................................107 1964 Niigata Earthquake .............................................................................................107 1968 Tokachi-Oki Earthquake.....................................................................................108 1978 Miyagi-ken-Oki Earthquake................................................................................109 1993 Hokkaido Nansei-oki Earthquake and Tsunami...................................................110 1995 Great Hanshin Earthquake ..................................................................................112 near-fault ground motion .........................................................................................113 liquefaction and port damage...................................................................................113
Recommended publications
  • Sir Edmund Taylor Whittaker (1873–1956)
    Open Research Online The Open University’s repository of research publications and other research outputs ‘A man who has infinite capacity for making things go’: Sir Edmund Taylor Whittaker (1873–1956) Journal Item How to cite: Maidment, Alison and McCartney, Mark (2019). ‘A man who has infinite capacity for making things go’: Sir Edmund Taylor Whittaker (1873–1956). British Journal for the History of Mathematics, 34(3) pp. 179–193. For guidance on citations see FAQs. c 2019 British Society for the History of Mathematics https://creativecommons.org/licenses/by-nc-nd/4.0/ Version: Accepted Manuscript Link(s) to article on publisher’s website: http://dx.doi.org/doi:10.1080/26375451.2019.1619410 Copyright and Moral Rights for the articles on this site are retained by the individual authors and/or other copyright owners. For more information on Open Research Online’s data policy on reuse of materials please consult the policies page. oro.open.ac.uk ‘A man who has infinite capacity for making things go’: Sir Edmund Taylor Whittaker (1873–1956) Alison Maidment Mark McCartney The Open University Ulster University Among the leading mathematicians of the nineteenth and twentieth centuries was British mathematician and astronomer, Sir Edmund Taylor Whittaker. Born in Southport, in the north of England, Whittaker’s career started at the University of Cambridge, before moving to Dunsink to become Royal Astronomer of Ireland and Andrews Professor of Astronomy at Trinity College, Dublin, and finishing in Scotland as Professor of Mathematics at the University of Edinburgh. Whittaker completed original work in a variety of fields, ranging from pure mathematics to mathematical physics and astronomy, as well as publishing on topics in philosophy, history, and theology.
    [Show full text]
  • Processing of Strong-Motion Accelerograms: Needs, Options and Consequences
    Soil Dynamics and Earthquake Engineering 25 (2005) 93–115 www.elsevier.com/locate/soildyn Processing of strong-motion accelerograms: needs, options and consequences David M. Boorea, Julian J. Bommerb,* aUS Geological Survey, 345 Middlefield Road, Menlo Park, CA 94025, USA bCivil and Environmental Engineering, Imperial College London, London SW7 2AZ, UK Accepted 25 October 2004 Abstract Recordings from strong-motion accelerographs are of fundamental importance in earthquake engineering, forming the basis for all characterizations of ground shaking employed for seismic design. The recordings, particularly those from analog instruments, invariably contain noise that can mask and distort the ground-motion signal at both high and low frequencies. For any application of recorded accelerograms in engineering seismology or earthquake engineering, it is important to identify the presence of this noise in the digitized time- history and its influence on the parameters that are to be derived from the records. If the parameters of interest are affected by noise then appropriate processing needs to be applied to the records, although it must be accepted from the outset that it is generally not possible to recover the actual ground motion over a wide range of frequencies. There are many schemes available for processing strong-motion data and it is important to be aware of the merits and pitfalls associated with each option. Equally important is to appreciate the effects of the procedures on the records in order to avoid errors in the interpretation and use of the results. Options for processing strong-motion accelerograms are presented, discussed and evaluated from the perspective of engineering application.
    [Show full text]
  • Time and Space Distribution of Coseismic Slip of the 2011 Tohoku Earthquake As Inferred from Tsunami Waveform Data Kenji Satake
    1 Time and Space Distribution of Coseismic Slip of the 2011 Tohoku Earthquake as 2 Inferred from Tsunami Waveform Data 3 4 Kenji Satake1, Yushiro Fujii2, Tomoya Harada1 and Yuichi Namegaya3 5 6 Electronic Supplement 7 Estimated slip for each subfault at 0.5 min interval 8 http://iisee.kenken.go.jp/staff/fujii/BSSA_Tohoku/BSSA-D-12-00122R1-esupp.html 9 10 11 Corresponding author: Kenji Satake 12 Earthquake Research Institute, University of Tokyo 13 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032 Japan 14 [email protected] 15 Revised on July 21, 2012 16 Final version September 26, 2012 17 18 1 19 Abstract A multiple time-window inversion of 53 high-sampling tsunami 20 waveforms on ocean bottom pressure, GPS, coastal wave, and tide gauges shows a 21 temporal and spatial slip distribution during the 2011 Tohoku earthquake. The 22 fault rupture started near the hypocenter and propagated into both deep and 23 shallow parts of the plate interface. Very large, approximately 25 m, slip off Miyagi 24 on the deep part, at a location similar to the previous 869 Jogan earthquake model, 25 was responsible for the initial rise of tsunami waveforms and the recorded tsunami 26 inundation in Sendai and Ishinomaki plains. Huge slip, up to 69 m, occurred on the 27 shallow part near the trench axis 3 min after the rupture initiation. This delayed 28 shallow rupture extended for 400 km with more than 10 m slip, at a location similar 29 to the 1896 Sanriku tsunami earthquake, and was responsible for the peak 30 amplitudes of the tsunami waveforms and the maximum tsunami heights measured 31 on the northern Sanriku coast, 100 km north of the largest slip.
    [Show full text]
  • Ground Liquefaction Is Not Dangerous for Human Lives
    13th World Conference on Earthquake Engineering Vancouver, B.C., Canada August 1-6, 2004 Paper No. 3225 GROUND LIQUEFACTION IS NOT DANGEROUS FOR HUMAN LIVES Motohiko HAKUNO1 SUMMARY The casualties by the liquefaction of the ground in the past earthquakes for 60 years in Japan are only six persons and more than ten thousands by other causes. It seems to be the following two reasons why we have so small number of casualties by the liquefaction of the ground like this. 1. The S wave of earthquake ground motion does not propagate into liquid, therefore, the earthquake motion on the surface of the ground upon the liquefied layer is not so severe. 2. Although the ground liquefaction causes the phenomenon of inclination, subsidence, and float-up of the structure, the process of these phenomena goes very slowly, therefore, people can have the time to refuge from the breaking structure. Although the loss of human lives due to the ground liquefaction are negligibly small, the economical loss due to such as the inclination or subsidence of structures occur by the liquefaction, however, the amount of those loss is not so much, because the economical damage of liquefaction occurs not frequently, but once every two or three years, and it is limited in narrow areas in Japan. Therefore, I would like to propose not to conduct the liquefaction countermeasures of ground all over the country because it is not economical. Of course, the sufficient liquefaction countermeasure should be done on such structure as the earth dam near the city by the liquefied collapse of which a lot of human lives would be lost.
    [Show full text]
  • Seismic and Aseismic Slip Along Subduction Zones and Their Tectonic Implications
    SEISMIC AND ASEISMIC SLIP ALONG SUBDUCTION ZONES AND THEIR TECTONIC IMPLICATIONS Hirao Kanamori Seismological Laboratory, California Institute of Technology, Pasadena, California 91125 Abstract. Results of detailed mechanism Introduction studies of great earthquakes are used togeth­ er with their repeat times to determine the In the theory of plate tectonics, litho­ amount of seismic slip along various subduc­ spheric subduction is one of the major tec­ tion zones. Comparison of the seismic slip tonic processes related to the formation and with the rate of plate motion suggests that, evolution of island arcs. The deep and in­ in Chile, and possibly Alaska, the seismic termediate earthquake zones along island arcs slip rate is comparable to the rate of plate delineate the geometry of the subducting motion while, in the Kuriles and Northern lithosphere, and major shallow earthquake Japan, the seismic slip constitutes only a activity along island arcs is a manifestation very small portion, approximately 1/4, of of the mechanical interaction between the the total slip. In the Sanriku region, and subducting and the overriding lithospheres. to the south of it, the relative amount of The geometrical agreement of focal mechanisms seismic slip is even smaller. These results of earthquakes along the Circum-Pacific belt suggest that in Chile and Alaska the coupling led McKenzie and Parker [1967] to the con­ and interaction between the oceanic and con­ cept of rigid plates dividing the earth's tinental lithosphere are very strong, re­ surface. Isacks and Molnar [1969] used the sulting in great earthquakes with a very geometry of the compression and tension axes large rupture zone, and in break-off of the of deep and intermediate earthquakes to in­ undergoing lithosphere at shallow depths.
    [Show full text]
  • Sir James Alfred Ewing, K.C.B., M.A., D.Sc, LL.D., F.R.S
    150 Obituary Notices. Sir James Alfred Ewing, K.C.B., M.A., D.Sc, LL.D., F.R.S. JAMES ALFRED EWING, a great engineer, scientific man, and charming Scot, was distinguished in many fields of activity. Born in 1855 at Dundee, where his father was a minister of the Free Church of Scotland, he grew up in an intellectual and spiritual atmosphere in which his early education was greatly influenced by his mother, whose critical taste in letters was passed on to her children. From Dundee High School Ewing proceeded in the early seventies to the University of Edinburgh, where his great ability soon manifested itself in the classes of Tait and Fleeming Jenkin, the latter of whom brought him into touch with Sir William Thomson (afterwards Lord Kelvin), then engaged in the development of submarine telegraph cables, an introduction which led to Ewing taking part in three cable-laying voyages to Brazil and the River Plate. Fleeming Jenkin was a man of wide culture, and his literary and scientific circle included Ewing and another young student, Robert Louis Stevenson, then at the commence- ment of an engineering training, soon to be abandoned for a literary career of the greatest distinction, the beginnings of which have been happily described by Ewing in "The Fleeming Jenkins and Robert Louis Steven- son." In 1878, at the early age of twenty-three, Ewing went to Japan as Professor of Mechanical Engineering in the University of Tokyo, a post which he occupied for five years, and there he made his classical researches in the widely different fields of magnetism and seismology.
    [Show full text]
  • Interview with Thomas K. Caughey
    THOMAS K. CAUGHEY (1927–2004) INTERVIEWED BY CAROL BUGÉ March 25 and April 2, 1987 Photo Courtesy Caltech’s Engineering & Science ARCHIVES CALIFORNIA INSTITUTE OF TECHNOLOGY Pasadena, California Subject area Engineering Abstract Interview in two sessions in 1987 by Carol Bugé with Thomas Kirk Caughey, Professor of Applied Mechanics and Caltech alumnus (PhD, 1954). Caughey was born and educated in Scotland (bachelor's degree, University of Glasgow, 1948.) Comes to the U.S. with Fulbright to Cornell, where he completes his master's degree in mechanical engineering in 1952. He then earns his PhD at Caltech in 1954. He recalls Caltech’s engineering and physics faculty in the 1950s: H. Frederic Bohnenblust, Arthur Erdelyi, Richard P. Feynman, Tsien Hsue-shen. Begins teaching at Caltech in 1955; recalls Caltech’s Engineering Division under Frederick Lindvall; other engineers and physicists; compares engineering to other disciplines. Return to Cornell and earlier period: outstanding Cornell professors Feynman, Hans Bethe, Barney Rosser, Ed Gunder, Harry Conway; recalls grad student Ross Evan Iwanowski. Problems of physics degree program at Cornell. Professors http://resolver.caltech.edu/CaltechOH:OH_Caughey_T Gray and Bernard Hague at Glasgow University. Comparison between American and European educational systems. His research in dynamics. Earthquake research at Caltech: George Housner and Donald Hudson. Discusses physics and engineering entering a decade of decline; coming fields of genetic engineering, cognitive science and computing, neural networks, and artificial intelligence. Anecdotes about Fritz Zwicky and Charles Richter. Comments on coeducation at Caltech. Caltech personalities: Robert Millikan in his late years; Paul Epstein; Edward Simmons, Richard Gerke; William A. Fowler; further on Zwicky, Hudson; engineers Donald Clark, Alfred Ingersoll; early memories of Earnest Watson.
    [Show full text]
  • Department D'analyse De Surete
    COMMISSARIAT A LENERGIE ATOMIQUE XA04NO298 INSTITUT DE PROTECTION ET DE SURETE NUCLEAIRE DEPARTMENT D'ANALYSE DE SURETE INIS-XA-N--027 RAPPORT DAS/733 MAIN FACTORS AECTING STRONG GROUND MOTION CALCULATIONS CRITICAL REVIEW AND ASESSMENT. MOHAMMADIOUN B. PECKER A. RAPPORT DAS/733 MAIN FACTORS AECTING STRONG GROUND MOTION CALCULATIONS CRITICAL REVIEW AND ASSESSMENT. MOHAMMADIOUN B. , PECKER A. 1990 * DAS/SASC ** Soci6t6 G6odynamique et Structure I I MAIN FACTORS AFFECTING STRONG GROUND MOTION CALCULATIONS: CRITICAL REVIEW AND ASSESSMENT BAGHER MOHAMMADIOUN * AND ALUN PECKER" 1. 1. INTRODUCTION in the interests of guarding lives and property against the effects of earthquakes, building codes are frequently enforced when recting conventional structures, usually calling for simple, static calculations. Where more vulnerable facilities are involved, the failure of which, or of parts of which, could subject the environment to harmful substances, more sophisticated methods are used to compute or verify their design, often accompanied by safety margins intended to compen- sate for uncertainties encountered at various stages of the analysis that begins with input seismic data and culminates with an effective anti-seismic dsign. The forthcoming discussion will deal with what is known of the characteristics of strong ground motion, highly variable according to contM without entering into the problems raised by scismotectonic studies, which actually constitute the first aspect that must be addressed when performing such an analysis. Our conclusion will be devoted to cogent R & D work in this area. 1.2. STRONG MOTION DATA The earliest record obtained with a strong motion accelerograph dates back to 1933 and was triggered by the Long Beach, California earthquake.
    [Show full text]
  • The Kobe (Hyogo-Ken Nanbu), Japan, Earthquake of January 16, 1995
    The Kobe (Hyogo-ken Nanbu), Japan, Earthquake of January 16, 1995 A report of preliminary observations prepared by Hiroo Kanamori California Institute of Technology he Kobe earthquake of January 16, 1995, is one of the Daishinsai (A major earthquake disaster in the Osaka-Kobe most damaging earthquakes in the recent history of area)." As ofJanuary 29, 1995, the casualty toll reached 5,094 T Japan. This earthquake is also called "The Hyogo-ken dead, 13 missing and 26,798 injured. Nanbu (Southern part of Hyogo prefecture) earthquake," This article presents some background on the earth- and the disaster caused by it is referred to as "Hanshin quake and its setting and a summary of some preliminary seismological results obtained by various investigators. The Japan Meteorological Agency ,/" e</-..... 0MA) located this earthquake at 34.60~ 135.00~ depth=22 km, origin time= 1943Tottori 1927Tango 1948 Fukui // '/~;/",~ 7 05:46:53.9, 1/17/1995JST, (20:46:53.9, 1/16/ (M=7.2) (M=7.a) (M=7.~) / ,.~o~.>:'/ k i 1995 GMT) with a JMA magnitude Mj=7.2 rS.. 7a (Figure 1). The epicenter is close to the city of Kobe (population, about 1.4 million), ap- proximately 200 km away from the Nankai trough (the major plate boundary between ,0., ~" "v"~.M "-'-" ~ the Philippine Sea and the Eurasia plates), and about 40 km from the Median Tectonic Line. In this sense this earthquake can be called an intraplate earthquake. In central- ,,o, oi ~J/ ,~ western Japan four major intraplate earth- .... "...C%<,,. ",z,.-.. :~/.S,,.-/" I \,q' _.. s , quakes have occurred since 1890 (Figure 1): .
    [Show full text]
  • Former Fellows Biographical Index Part
    Former Fellows of The Royal Society of Edinburgh 1783 – 2002 Biographical Index Part Two ISBN 0 902198 84 X Published July 2006 © The Royal Society of Edinburgh 22-26 George Street, Edinburgh, EH2 2PQ BIOGRAPHICAL INDEX OF FORMER FELLOWS OF THE ROYAL SOCIETY OF EDINBURGH 1783 – 2002 PART II K-Z C D Waterston and A Macmillan Shearer This is a print-out of the biographical index of over 4000 former Fellows of the Royal Society of Edinburgh as held on the Society’s computer system in October 2005. It lists former Fellows from the foundation of the Society in 1783 to October 2002. Most are deceased Fellows up to and including the list given in the RSE Directory 2003 (Session 2002-3) but some former Fellows who left the Society by resignation or were removed from the roll are still living. HISTORY OF THE PROJECT Information on the Fellowship has been kept by the Society in many ways – unpublished sources include Council and Committee Minutes, Card Indices, and correspondence; published sources such as Transactions, Proceedings, Year Books, Billets, Candidates Lists, etc. All have been examined by the compilers, who have found the Minutes, particularly Committee Minutes, to be of variable quality, and it is to be regretted that the Society’s holdings of published billets and candidates lists are incomplete. The late Professor Neil Campbell prepared from these sources a loose-leaf list of some 1500 Ordinary Fellows elected during the Society’s first hundred years. He listed name and forenames, title where applicable and national honours, profession or discipline, position held, some information on membership of the other societies, dates of birth, election to the Society and death or resignation from the Society and reference to a printed biography.
    [Show full text]
  • USGS Open File Report 2007-1365
    Investigation of the M6.6 Niigata-Chuetsu Oki, Japan, Earthquake of July 16, 2007 Robert Kayen, Brian Collins, Norm Abrahamson, Scott Ashford, Scott J. Brandenberg, Lloyd Cluff, Stephen Dickenson, Laurie Johnson, Yasuo Tanaka, Kohji Tokimatsu, Toshimi Kabeyasawa, Yohsuke Kawamata, Hidetaka Koumoto, Nanako Marubashi, Santiago Pujol, Clint Steele, Joseph I. Sun, Ben Tsai, Peter Yanev, Mark Yashinsky, Kim Yousok Open File Report 2007–1365 2007 U.S. Department of the Interior U.S. Geological Survey 1 U.S. Department of the Interior Dirk Kempthorne, Secretary U.S. Geological Survey Mark D. Myers, Director U.S. Geological Survey, Reston, Virginia 2007 For product and ordering information: World Wide Web: http://www.usgs.gov/pubprod Telephone: 1-888-ASK-USGS For more information on the USGS—the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment: World Wide Web: http://www.usgs.gov Telephone: 1-888-ASK-USGS Suggested citation: Kayen, R., Collins, B.D., Abrahamson, N., Ashford, S., Brandenberg, S.J., Cluff, L., Dickenson, S., Johnson, L., Kabeyasawa, T., Kawamata, Y., Koumoto, H., Marubashi, N., Pujol, S., Steele, C., Sun, J., Tanaka, Y., Tokimatsu, K., Tsai, B., Yanev, P., Yashinsky , M., and Yousok, K., 2007. Investigation of the M6.6 Niigata-Chuetsu Oki, Japan, Earthquake of July 16, 2007: U.S. Geological Survey, Open File Report 2007-1365, 230pg; [available on the World Wide Web at URL http://pubs.usgs.gov/of/2007/1365/]. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S.
    [Show full text]
  • A Discussion on the Relations of Site Effect and Damage of Wooden Houses Using with Microtremors in Fukui Plain Affected by the 1948 Fukui Earthquake
    13th World Conference on Earthquake Engineering Vancouver, B.C., Canada August 1-6, 2004 Paper No. 722 A DISCUSSION ON THE RELATIONS OF SITE EFFECT AND DAMAGE OF WOODEN HOUSES USING WITH MICROTREMORS IN FUKUI PLAIN AFFECTED BY THE 1948 FUKUI EARTHQUAKE. Norio ABEKI*1 and Toshiyuki MAEDA*2 SUMMARY Authors observed microtremors in Fukui Plain to discuss on the relationships between dynamic characteristics of surface geology and the damages of wooden houses caused by the 1948 Fukui Earthquake. By the distribution maps of predominant periods using H/V spectral ratio and damaged ratios of wooden houses, the distribution of the short periods corresponded to the low damaged ratios. And the areas of predominant long periods distributed on alluvial deposit in the western part from the earthquake fault. The high damage ratios at the sites of alluvial deposit are located within 8km from the earthquake fault, but the ratios decreased and varied widely in the areas farther than 8km. The predominant periods are related with the thickness of alluvial deposit. We can conclude that the earthquake damages were related with the dynamic characteristics of surface geology in this area. INTRODUCTION The 1948 Fukui Earthquake occurred at July 28, 1948 and it affected the buildings, railway, road, bridges and another social facilities. 3,763 persons had been killed, 36,134 houses completely and 11,816 houses partially destroyed, and 3,851 houses burned down by The Earthquake.1) The epicenter located at Maruoka town where is in the Fukui Plain, and the seismic fault went through from south to north in the plain.
    [Show full text]