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IODP for Geohazard Mitigation
IODP for Geohazard mitigation: Estimation of rupture area and fault models for historical and pre-historical earthquakes by using submarine event deposit detected from ocean drilling survey Masanobu Shishikura and Yuichi Namegaya Geological Survey of Japan, AIST, 305-8576 Tsukuba, Japan (Corresponding: [email protected]) Abstract Constructing precise fault model of historical and pre-historical subduction zone earthquakes is important for evaluation and mitigation of seismic and tsunami hazards. Because parameters for constraining the model of further past events essentially lack due to limited records, it is necessary to obtain paleoseismological data by offshore piston coring and drilling. Detecting and identifying event deposit such as seismic turbidite, rupture extent can be constrained along the subduction zone. 1. Introduction Fault model is a foundation to evaluate future seismic phenomena such as strong ground motion, crustal movement, tsunami inundation and so on. To estimate fault models of historical or pre-historical earthquakes, we usually try to know their precise rupture area. Since there are no instrumental observation data for estimating them, it must be identified of the magnitude and distribution of crustal movement and tsunami by analyzing historical records and geomorphological and geological traces. In other words, these evidences are unique indicator, and can provide good parameters to estimate rupture area of such earthquakes. If the rupture area is located on coastal region, it is relatively easy to recognize crustal movement from relative sea level change (abrupt uplift and subsidence) that has been recorded in such as marine terrace. However, most of the rupture area of interplate earthquake along subduction zone is located off coast. -
Hyōgo Prefecture
Coor din ates: 3 4 °4 1 ′2 6 .9 4 ″N 1 3 5 °1 0′5 9 .08″E Hyōgo Prefecture Hyōgo Prefecture (兵庫県 Hyōgo-ken) is a prefecture of Japan located in the Kansai region on Hyōgo Prefecture Honshu island.[1] The capital is Kobe.[2] 兵庫県 Prefecture Contents Japanese transcription(s) • Japanese 兵庫県 History • Rōmaji Hyōgo-ken Geography Cities Towns Islands National parks Mergers Flag Future mergers Symbol Economy Culture National Treasures of Japan Important Preservation Districts for Groups of Historic Buildings in Japan Museums Education Universities Amagasaki Takarazuka Sanda Nishinomiya Ashiya Kobe Kato Akashi Kakogawa Country Japan Himeji Region Kansai Akō Island Honshu High schools Capital Kobe Sports Government Tourism • Governor Toshizō Ido Festival and events Area Transportation Rail • Total 8,396.13 km2 People movers (3,241.76 sq mi) Road Area rank 12th Expressways Population (November 1, 2011) National highways Ports • Total 5,582,978 Airport • Rank 7th • Density 660/km2 (1,700/sq mi) Notable people Sister regions ISO 3166 JP-28 code See also Notes Districts 8 References Municipalities 41 External links Flower Nojigiku (Chrysanthemum japonense) Tree Camphor tree History (Cinnamomum camphora) Bird Oriental white stork Present-day Hyōgo Prefecture includes the former provinces of Harima, Tajima, Awaji, and parts (Ciconia boyciana) of Tanba and Settsu.[3] Website web.pref.hyogo.lg.jp/fl /english/ (http://web.pre In 1180, near the end of the Heian period, Emperor Antoku, Taira no Kiyomori, and the Imperial f.hyogo.lg.jp/fl/english/) court moved briefly to Fukuhara, in what is now the city of Kobe. -
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. -
Supplementary Chapter: Technical Notes
Supplementary Chapter: Technical Notes Tomoki Nakaya, Keisuke Fukui, and Kazumasa Hanaoka This supplementary provides the details of several advanced principle, tends to be statistically unstable when ei is methods and analytical procedures used for the atlas project. small. Bayesian hierarchical modelling with spatially structured random effects provides flexible inference frameworks to T1 Spatial Smoothing for Small-Area-Based obtain statistically stable and spatially smoothed estimates of Disease Mapping: BYM Model and Its the area-specific relative risk. The most popular model is the Implementation BYM model after the three authors who originally proposed it, Besag, York, and Mollié (Besag et al. 1991). The model T. Nakaya without covariates is shown as: oe|θθ~Poisson Disease mapping using small areas such as municipalities in ii ()ii this atlas often suffers from the problem of small numbers. log()θα=+vu+ In the case of mapping SMRs, small numbers of deaths in a iii spatial unit cause unstable SMRs and make it difficult to where α is a constant representing the overall risk, and vi and read meaningful geographic patterns over the map of SMRs. ui are unstructured and spatially structured random effects, To overcome this problem, spatial smoothing using statisti- respectively. The unstructured random effect is a simple cal modelling is a common practice in spatial white noise representing the geographically independent epidemiology. fluctuation of the relative risk: When we can consider the events of deaths to occur inde- vN~.0,σ 2 pendently with a small probability, it is reasonable to assume iv() the following Poisson process: The spatially structured random effect models the spatial correlation of the area-specific relative risks among neigh- oe|θθ~Poisson ii ()ii bouring areas: where oi and ei are the observed and expected numbers of wu deaths in area i, and is the relative risk of death in area i. -
Japan Geoscience Union Meeting 2009 Presentation List
Japan Geoscience Union Meeting 2009 Presentation List A002: (Advances in Earth & Planetary Science) oral 201A 5/17, 9:45–10:20, *A002-001, Science of small bodies opened by Hayabusa Akira Fujiwara 5/17, 10:20–10:55, *A002-002, What has the lunar explorer ''Kaguya'' seen ? Junichi Haruyama 5/17, 10:55–11:30, *A002-003, Planetary Explorations of Japan: Past, current, and future Takehiko Satoh A003: (Geoscience Education and Outreach) oral 301A 5/17, 9:00–9:02, Introductory talk -outreach activity for primary school students 5/17, 9:02–9:14, A003-001, Learning of geological formation for pupils by Geological Museum: Part (3) Explanation of geological formation Shiro Tamanyu, Rie Morijiri, Yuki Sawada 5/17, 9:14-9:26, A003-002 YUREO: an analog experiment equipment for earthquake induced landslide Youhei Suzuki, Shintaro Hayashi, Shuichi Sasaki 5/17, 9:26-9:38, A003-003 Learning of 'geological formation' for elementary schoolchildren by the Geological Museum, AIST: Overview and Drawing worksheets Rie Morijiri, Yuki Sawada, Shiro Tamanyu 5/17, 9:38-9:50, A003-004 Collaborative educational activities with schools in the Geological Museum and Geological Survey of Japan Yuki Sawada, Rie Morijiri, Shiro Tamanyu, other 5/17, 9:50-10:02, A003-005 What did the Schoolchildren's Summer Course in Seismology and Volcanology left 400 participants something? Kazuyuki Nakagawa 5/17, 10:02-10:14, A003-006 The seacret of Kyoto : The 9th Schoolchildren's Summer Course inSeismology and Volcanology Akiko Sato, Akira Sangawa, Kazuyuki Nakagawa Working group for -
Seismic Activities Along the Nankai Trough
ΐῑῐῒ Bull. Earthq. Res. Inst. Univ. Tokyo Vol. 12 ῍,**-῎ pp. +2/ῌ+3/ Seismic Activities along the Nankai Trough Kimihiro Mochizuki+῎* and Koichiro Obana,῎ +) Earthquake Research Institute, University of Tokyo ,) Japan Marine Science and Technology Center Abstrcat Occurrences of large earthquakes with estimated magnitudes as large as 2 along the Nankai Trough have been well documented in historical materials, and the oldest documented earthquake dates back to A.D. 02.. The recurrence periods are fairly constant, and are approximately ,** years for the earthquakes occurring before +-0+, and about +** years for those after +-0+. However, the number of smaller earthquakes observed by the on-land seismic stations is very small. Both seismic and tectonic couplings along the interface between the overriding and subducting plates are estimated to be nearly +**ῌ from seismic and geodetic data. Therefore, it has been considered that relatively simple physics govern the generation of the historical large earthquakes along the Nankai Trough. With the availability of abundant information on large earthquakes and modern data sets from dense seismic and geodetic networks, the Nankai Trough is one of the best-studied seismo- genic zones. Although improvements have been seen in estimating the fault-plane parameters for the historical earthquakes, there still remain important unanswered questions, such as if there have been unidentified earthquakes that fill in the ,**-year recurrence period. Estimates of precise fault-plane parameters are being demanded to have a better understanding of earthquake genera- tion. One of the most important topics is where the updip limit of the seismogenic zone is located. The location had not been resolved by on-land seismic observations. -
Earthquake-Resistant Design for Architects Revised Edition to Whom This Report May Interest
Earthquake-resistant Design for Architects Revised edition To whom this report may interest, There are many earth quake prone countries in this world, not only Japan Therefore, at various occasions we were requested to explain our efforts and initiatives for reducing the risk of future earth quakes. After the Great Hanshin Earthquake, we had studied various methods to reduce the damages to ensure inhabitants lives, through collaborations of architects, structural engineers, building mechanical engineers and various specialists. Those considerations were realized in the book “Taishinkyohon” by the Japan Institute of Architects. The book was also revised after the Great East Japan Earthquake experiences. Owing to the language barriers, we are not able to explain easily our initiatives to outsiders. Therefore, we had tried to publish it in an English edition. Nevertheless through economic diculties, English editions had not been translated until now. In 2014, NPO called Japan Aseismic Safety Organization (JASO), decided to donate for the English translation, and furthermore their members donated for editing in English to form this report as well. A free report with internet download http://www.jaso.jp/ Since original Japanese book was published by publisher Shokokusha in Tokyo who still has the right to publish this book, we finally agreed that we would not sell commercially, but disperse only as a delivered free booklet with internet downloads. Therefore, anyone who likes to study is able to download from the HP of JASO who is holding their -
Contrasting Volcano Spacing Along SW Japan Arc Caused by Difference
www.nature.com/scientificreports OPEN Contrasting volcano spacing along SW Japan arc caused by diference in age of subducting lithosphere Yoshiyuki Tatsumi1,2*, Nobuaki Suenaga3, Shoichi Yoshioka2,3, Katsuya Kaneko 1,2 & Takumi Matsumoto4 The SW Japan arc built by subduction of the Philippine Sea (PHS) plate exhibits uneven distribution of volcanoes: thirteen Quaternary composite volcanoes form in the western half of this arc, Kyushu Island, while only two in the eastern half, Chugoku district. Reconstruction of the PHS plate back to 14 Ma, together with examinations based on thermal structure models constrained by high- density heat fow data and a petrological model for dehydration reactions suggest that fuids are discharged actively at depths of 90–100 km in the hydrous layer at the top of the old (> 50 Ma), hence, cold lithosphere sinking beneath Kyushu Island. In contrast, the young (15–25 Ma) oceanic crust downgoing beneath Chugoku district releases fuids largely at shallower depths, i.e. beneath the non- volcanic forearc, to cause characteristic tectonic tremors and low-frequency earthquakes (LFEs) and be the source of specifc brine springs. Much larger amounts of fuids supplied to the magma source region in the western SW Japan arc could build more densely-distributed volcanoes. Subduction zone volcanoes tend to exhibit regular spacing along a volcanic arc, although the spacing of volcanoes within individual arcs is ofen variable from arc to arc1, 2. A broad positive correlation between the linear density of active volcanoes and the rate of plate convergence suggests that the faster subduction contributes to greater melt production in the mantle wedge3–5. -
Constraints on the Moho in Japan and Kamchatka
Tectonophysics 609 (2013) 184–201 Contents lists available at ScienceDirect Tectonophysics journal homepage: www.elsevier.com/locate/tecto Review Article Constraints on the Moho in Japan and Kamchatka Takaya Iwasaki a, Vadim Levin b,⁎, Alex Nikulin b, Takashi Iidaka a a Earthquake Research Institute, University of Tokyo, Japan b Rutgers University, NJ, USA article info abstract Article history: This review collects and systematizes in one place a variety of results which offer constraints on the depth Received 1 July 2012 and the nature of the Moho beneath the Kamchatka peninsula and the islands of Japan. We also include stud- Received in revised form 12 November 2012 ies of the Izu–Bonin volcanic arc. All results have already been published separately in a variety of venues, and Accepted 22 November 2012 the primary goal of the present review is to describe them in the same language and in comparable terms. Available online 3 December 2012 For both regions we include studies using artificial and natural seismic sources, such as refraction and reflec- tion profiling, detection and interpretation of converted-mode body waves (receiver functions), surface wave Keywords: Kamchatka dispersion studies (in Kamchatka) and tomographic imaging (in Japan). The amount of work done in Japan is Japan significantly larger than in Kamchatka, and resulting constraints on the properties of the crust and the upper- Crustal structure most mantle are more detailed. Upper-mantle structure Japan and Kamchatka display a number of similarities in their crustal structure, most notably the average Moho crustal thickness in excess of 30 km (typical of continental regions), and the generally gradational nature of the crust–mantle transition where volcanic arcs are presently active. -
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. -
Fully-Coupled Simulations of Megathrust Earthquakes and Tsunamis in the Japan Trench, Nankai Trough, and Cascadia Subduction Zone
Noname manuscript No. (will be inserted by the editor) Fully-coupled simulations of megathrust earthquakes and tsunamis in the Japan Trench, Nankai Trough, and Cascadia Subduction Zone Gabriel C. Lotto · Tamara N. Jeppson · Eric M. Dunham Abstract Subduction zone earthquakes can pro- strate that horizontal seafloor displacement is a duce significant seafloor deformation and devas- major contributor to tsunami generation in all sub- tating tsunamis. Real subduction zones display re- duction zones studied. We document how the non- markable diversity in fault geometry and struc- hydrostatic response of the ocean at short wave- ture, and accordingly exhibit a variety of styles lengths smooths the initial tsunami source relative of earthquake rupture and tsunamigenic behavior. to commonly used approach for setting tsunami We perform fully-coupled earthquake and tsunami initial conditions. Finally, we determine self-consistent simulations for three subduction zones: the Japan tsunami initial conditions by isolating tsunami waves Trench, the Nankai Trough, and the Cascadia Sub- from seismic and acoustic waves at a final sim- duction Zone. We use data from seismic surveys, ulation time and backpropagating them to their drilling expeditions, and laboratory experiments initial state using an adjoint method. We find no to construct detailed 2D models of the subduc- evidence to support claims that horizontal momen- tion zones with realistic geometry, structure, fric- tum transfer from the solid Earth to the ocean is tion, and prestress. Greater prestress and rate-and- important in tsunami generation. state friction parameters that are more velocity- weakening generally lead to enhanced slip, seafloor Keywords tsunami; megathrust earthquake; deformation, and tsunami amplitude. -
Great East Japan Earthquake, Jr East Mitigation Successes, and Lessons for California High-Speed Rail
MTI Funded by U.S. Department of Services Transit Census California of Water 2012 Transportation and California Great East Japan Earthquake, Department of Transportation JR East Mitigation Successes, and Lessons for California High-Speed Rail MTI ReportMTI 12-02 MTI Report 12-37 December 2012 MINETA TRANSPORTATION INSTITUTE MTI FOUNDER Hon. Norman Y. Mineta The Mineta Transportation Institute (MTI) was established by Congress in 1991 as part of the Intermodal Surface Transportation Equity Act (ISTEA) and was reauthorized under the Transportation Equity Act for the 21st century (TEA-21). MTI then successfully MTI BOARD OF TRUSTEES competed to be named a Tier 1 Center in 2002 and 2006 in the Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users (SAFETEA-LU). Most recently, MTI successfully competed in the Surface Transportation Extension Act of 2011 to Founder, Honorable Norman Thomas Barron (TE 2015) Ed Hamberger (Ex-Officio) Michael Townes* (TE 2014) be named a Tier 1 Transit-Focused University Transportation Center. The Institute is funded by Congress through the United States Mineta (Ex-Officio) Executive Vice President President/CEO Senior Vice President Department of Transportation’s Office of the Assistant Secretary for Research and Technology (OST-R), University Transportation Secretary (ret.), US Department of Strategic Initiatives Association of American Railroads Transit Sector Transportation Parsons Group HNTB Centers Program, the California Department of Transportation (Caltrans), and by private grants and donations. Vice Chair Steve Heminger (TE 2015) Hill & Knowlton, Inc. Joseph Boardman (Ex-Officio) Executive Director Bud Wright (Ex-Officio) Chief Executive Officer Metropolitan Transportation Executive Director The Institute receives oversight from an internationally respected Board of Trustees whose members represent all major surface Honorary Chair, Honorable Bill Amtrak Commission American Association of State transportation modes.