Spatial Distribution of Causes of Death in the 2011 Tohoku Tsunami at Ishinomaki City, Miyagi Prefecture
Tomoki Serikawa*,, Shuji Seto**,***, Anawat Suppasri**,***, and Fumihiko Imamura**,***
*Graduate School of Engineering, Tohoku University
6-6 Aramaki Aza Aoba, Aoba, Sendai, Miyagi 980-8579, Japan
**International Research Institute of Disaster Science (IRIDeS), Tohoku University, Miyagi, Japan
***Core Research Cluster of Disaster Science, Tohoku University, Miyagi, Japan
To predict and suppress human casualty in a future tsunami disaster, it is crucial to analyze victim information from past disasters and clarify the causes of human casualty. Examining the causes of human casualty requires analyses that combine various hazard information and victim information in subregional units. This study aims to grasp the factors that caused human casualty during the Great East Japan Earthquake in 2011 using Miyagi Prefectural Police Headquarters’ victim information. Therefore, at Ishinomaki City, Miyagi Prefecture, we researched the spatial distribution of causes of death based on the victims’ addresses and the corpse location, as well as the occurrence factor of each cause of death. As a result, we obtain the following results. (1) The spatial distribution of victims based on the corpse location is more clearly related to the hazard than the victim’s address. In other words, it is proved that the detection site of the body is significant when examining the relationship between human casualty and hazards. (2) The hypothesis of each cause of death is verified based on the spatial distribution of each cause of death, hazard information, the victim’s age, and the date of detecting the body. As a result, it is suggested that drowning, death due to fire, and hypothermia are causes of death related to external forces. It is also suggested that hypothermia and heart disease are causes of death related to individual fragility. (3) Such a possibility showed that the cause of death could not be identified for death from unknown origin due to the bodies’ decay resulting from taking time to detect the dead bodies. (4) We propose a diagram of relationship between the causes of death and the occurrence of factors of death at Ishinomaki City. In the future, to generalize the relationship, it is considered that the same analysis will be required in the coastal municipalities of Miyagi Prefecture.
-  Miyagi Prefecture, “The Great East Japan Earthquake Disaster Response in Miyagi Prefecture in the First Year Following the Earthquake and Tsunami Digest Version,” https://www.pref.miyagi.jp/pdf/kiki/2digest.pdf [accessed May 12, 2020]
-  The National Police Agency, “Retrospective and Prospects The Great East Japan Earthquake and Police in 2011,” 2012, https://www.npa.go.jp/archive/keibi/syouten/syouten281/pdf/ALL.pdf (in Japanese) [accessed April 23, 2020]
-  Cabinet Office of Japan, “Damage Estimation for the Great Nankai Trough Earthquake (Second Report),” http://www.bousai.go.jp/jishin/nankai/nankaitrough_info.html (in Japanese) [accessed April 22, 2020]
-  S. Seto, F. Imamura, and A. Suppasri, “Challenge to Build the Science of Human Survival from Disaster Starting from Analysis for the 2011 Tohoku Tsunami,” J. Disaster Res., Vol.14, No.9, pp. 1323-1328, doi: 10.20965/jdr.2019.p1323, 2019.
-  Cabinet Office of Japan, “Countermeasures for Oceanic Trench-type Earthquakes around the Japan Trench and Chishima Trench,” http://www.bousai.go.jp/jishin/nihonkaiko_chishima/index.html (in Japanese) [accessed September 12, 2020]
-  E. Ikuta, M. Miyano, E. Itoigawa, A. Nishimura, H. Tanaka, K. Kajiwara, and Y. Kumagai, “Analysis on the Mechanism of Human Casualties Due to the 1995 Hyogoken-Nanbu Earthquake Based on the Comprehensive Database,” J. of Architecture and Planning, No.590, pp. 117-123, doi: 10.3130/aija.70.117_1 2005 (in Japanese).
-  Kahoku Shimpo, “Document of 2011 Great East Japan Earthquake: What happened at that time? (No.22 Concluded) Cruel Snow, Ruthless Star Sky (Minamisanriku, Miyagi)/Hypothermia Due to Freezing Cold Took Human Life,” Kahoku Shimpo Newspaper Morning edition, June 9, 2011 (in Japanese).
-  K. Funayama, “Postmortem Examination in Huge Disaster –From Experience of 2011 Great East Japan Earthquake–,” Bulletin Medical Association of Niigata City, 2018 (in Japanese).
-  S. Seto and F. Imamura, “Classification of tsunami deaths by modifying ICD-10 categories in the 2011 Tohoku earthquake tsunami – A case study in Miyagi prefecture,” Int. J. of Disaster Risk Reduction, Vol.50, Article No.101743, doi: 10.1016/j.ijdrr.2020.101743, 2020.
-  S. Suzyki and H. Hayashi, “A Preliminary Critical Causal Analysis on the Mortality Caused by the 2011 East Japan Earthquake Tsunami,” J. of Social Safety Science, No.15, pp. 179-188, doi: 10.11314/jisss.15.179, 2011 (in Japanese).
-  K. Tani, “Distribution of the number of deaths and the death rate on the Great East Japan Earthquake,” Occasional Paper of Department of Geography, Saitama University, Vol. 32, pp. 1-26, 2012 (in Japanese).
-  M. Ushiyama, M. Honma, S. Yokomaku, and K. Sugimura, “Relationship between Primary Causes and Rate of Victim Caused by the 2011 off the Pacific Coast of Tohoku Earthquake in Sanriku District,” J. of Japan Society for Natural Disaster Science, Vol.33, No.3, pp. 233-247, 2014 (in Japanese).
-  M. Tanishita and T. Asada, “Factors Associated with District Victim Rate by Tohoku Earthquake Tsunami in Minamisanriku Town,” J. of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering and Earthquake Engineering (SE/EE)), Vol.70, No.4, pp. I_66-I_70, doi: 10.2208/jscejseee.70.I_66, 2014 (in Japanese).
-  S. Seto, T. Serikawa, A. Suppasri, and F. Imamura, “Examining the relationship between the cause of death and location of the deceased in the 2011 Tohoku Tsunami: A case study of Kesennuma in Miyagi prefecture,” AGU Fall Meeting 2019, 2019.
-  Statistics Bureau of Japan, Ministry of Internal Affairs and Communications, “The National Census in 2011,” https://www.stat.go.jp/data/kokusei/2010/ (in Japanese) [accessed May, 3 2020]
-  Geospatial Information Authority of Japan, “The Area of Inundation by Great East Japan Earthquake Tsunami (Approximate Value, 5th Report),” https://www.gsi.go.jp/common/000059939.pdf (in Japanese) [accessed May 4, 2020]
-  Miyagi Prefecture, “Damage Caused by the Great East Japan Earthquake as of April 30, 2020,” https://www.pref.miyagi.jp/uploaded/attachment/791487.pdf (in Japanese) [accessed May, 9 2020]
-  Japan Association for Science and Engineering, “Report on the 2011 Great East Japan Earthquake and Tsunami Fires [Complete Version],” 2016 (in Japanese).
-  Y. Aoki, H. Iwase, S. Kubo, and A. Ro, “Questionnaire Survey Report for Dispatched Doctors in 2011 Great East Japan Earthquake Based on Support Project for Postmortem Examination in Disaster Situations by Japanese Society of Legal Medicine,” Japanese Society of Legal Medicine, pp. 39-49, 2012 (in Japanese).
-  Japan Post, “Download Zip Code Data,” https://www.post.japanpost.jp/zipcode/download.html (in Japanese) [accessed March 3, 2020]
-  City Bureau of the Land, Infrastructure and Transportation Ministry of Japan and the Center for Spatial Information Science of the University of Tokyo, “Reconstruction Assistance Survey Archives,” 2012, http://fukkou.csis.u-tokyo.ac.jp (in Japanese) [accessed March 4, 2020]
-  “Nanzando’s Medical Dictionary,” 20th edition, Nanzando, 2015 (in Japanese).
-  T. Hatori, “Religious Monuments of the Genroku Tsunami in 1703 at Kujukuri-hama, Chiba Prefecture,” Zisin (J. of the Seismological Society of Japan, 2nd ser.), Vol.2, No.28, pp. 98-101, 1975 (in Japanese).
-  N. Nishikiori, T. Abe, D. G. M. Costa, S. D. Dharmaratne, O. Kunii, and K. Moji, “Timing of mortality among internally displaced persons due to the tsunami in Sri Lanka: cross sectional household survey,” BMJ, Vol.332, pp. 334-335, doi: 10.1136/bmj.38693.465023.7C, 2009.
-  U Hiroi, T. Yamada, and N. Sakamoto, “Overview of Field Surveys concering Tsunami Fire in the Great East-Japan Earthquake,” J. of Social Safety Science, No.18, pp. 161-168, doi: 10.11314/jisss.18.161, 2012 (in Japanese).
-  Y. Imazu, H. Notake, A. Hokugo, and F. Imamura, “Geographical Analysis of Tsunami Fires in the Great East-Japan Earthquake and Tsunami Disaster and Risk Index,” J. of Japan Society for Natural Disaster Science, Vol.33, No.2, pp. 127-143, 2014 (in Japanese).
-  U Hiroi, “Post-Earthquake Fire Estimation Method Hierarchical Baysian Models and its Application,” J. of Social Safety Science, No.27, pp. 303-311, doi: 10.11314/jisss.27.303, 2015 (in Japanese).
-  T. Tomita and Y. Chida, “Development of numerical Simulation Method for Debris Movement and Fire Incidence Induced by Tsunamis,” J. of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering), Vol.72, No.2, pp. I_421-I_426, doi: 10.2208/kaigan.72.I_421, 2016 (in Japanese).
-  Y. Kumagai, E. Itoigawa, K. H. Ju, H. Fukuda, and K. Amagai, “Study on Fatalities in Kobe City at the 1995 Great Hanshin-Awaji Earthquake,” Comprehensive Urban Studies, Vol. 61, pp. 123-143, 1996 (in Japanese).
-  G. Matsuzawa, H. Sano, H. Ohnuma, A. Tomiya, Y Kuwahara, C. Hashimoto, I. Imamura, S. Ishibashi, M. Kobayashi, T. Ishii, I. Kaneda, and E. Itoi, “Patient trends in orthopedic traumas and related disorders after tsunami caused by the Great East Japan Earthquake: An experience in the primary referral medical center,” J. of Orthopaedic Science, Vol.21, No.4, pp. 507-511, doi: 10.1016/j.jos.2016.03.007, 2016.
-  K. Sato, M. Kobayashi, S. Ishibashi, S. Ueda, and S. Suzuki, “Chest injuries and the 2011 Great East Japan Earthquake,” Respiratory Investigation, Vol.51, No.1, pp. 24-27, doi: 10.1016/j.resinv.2012.11.002, 2013.
-  A. Suppasri, I. Charvet, K. Imai, and F. Imamura, “Fragility Curves Based on Data from the 2011 Tohoku-Oki Tsunami in Ishinomaki City, with Discussion of Parameter Influencing Building Damage,” Earthquake Spectra, Vol.31, No.2, pp. 841-868, doi: 10.1193/053013EQS138M, 2015.
-  M. Fukushima, T. Matsuura, and A. Hattori, “Experimental Study on the Characteristics of River Tsunami,” J. of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering), Vol.69, No.2, pp .I_261-I_265, doi: 10.2208/kaigan.69.I_261, 2013 (in Japanese).
-  Ishinomaki City, “Great East Japan Earthquake Disaster Verification Report,” https://www.city.ishinomaki.lg.jp/cont/10106000/8284/20131213153754.html (in Japanese) [accessed May 9, 2020]
-  K. Imai, D. Sugawara, T. Takahashi, S. Iwama, and H. Tanaka, “Numerical Study for Sediment Transport due to Tsunami around the Kitakami River Mouth,” J. of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering), Vol.71, No.2, pp. I_247-I_252, doi: 10.2208/kaigan.71.I_247, 2015 (in Japanese).
-  H. Furukawa, D. Kudo, A. Nakagawa, T. Matsumura, Y. Abe, R. Konishi, S. Yamanouchi, S. Ishibashi, M. Kobayashi, N. Narita, T. Washio, T. Arafune, T. Tominaga, and S. Kushimoto, “Hypothermia in Victims of the Great East Japan Earthquake: A Survey in Miyagi Prefecture,” Disaster Medicine and Public Health Preparedness, Vol.8, No.5, pp. 379-389, doi: 10.1017/dmp.2014.70, 2014.
-  F. Fujibe, “Long-term Variation in Cold Mortality and Winter Temperature in Japan,” TENKI, Vol.63, No.6, pp. 469-476, 2016 (in Japanese).
-  Y. Ohashi, “New Terminology Thermal Index,” TENKI, Vol.57, No.1, pp. 57-59, 2010 (in Japanese).
-  R. Osczevski and M. Bluestein, “The New Wind Chill Equivalent Temperature Chart,” Bulletin of American Meteorological Society, Vol.86, No.10, pp. 1453-1458, 2005
-  Japan Meteorological Agency, “Search for Past Weather Data, Ishinomaki, March, 2011 (daily values), Main Elements,” https://www.data.jma.go.jp/obd/stats/etrn/view/daily_s1.php?prec_no=34&block_no=47592&year=2011&month=3&day=&view= (in Japanese) [accessed April 13, 2020]
-  The Canadian Network for the Detection of Atmospheric Change, “Environment Canada Wind Chill Chart,” https://www.candac.ca/candac/Outreach/Teacher_Resources_Index/tri/31.pdf [accessed May 5, 2020]
-  Statistics Bureau of Japan, Ministry of Internal Affairs and Communications, “Population Dynamics Survey/Population Dynamics Number of Confirmed Deaths,” Ministry of Health, Labour, and Welfare, 2018 (in Japanese).
-  J. Leor, W. K. Poole, and R. A. Kloner, “Sudden cardiac death triggered by an earthquake,” The New England J. of Medicine, Vol.334, pp. 413-419, doi: 10.1056/NEJM199602153340701, 1996.
-  M. Kodama, H. Watanabe, and Y. Aizawa, “Heart’s Selection 2: Disaster and Heart Disease Acute Cardiovascular Disease in Major Disasters – Acute Myocardial Infarction, Sudden Death, Takotsubo Myocardial Disorder,” Shinzo (Heart), Vol.39, No.2, pp. 100-103, 2007 (in Japanese).
-  Y. Sakata and H. Shimokawa, “Heart’s Selection 1: Response to Cardiovascular Disease in Disasters, Disasters and Heart Failure,” Shinzo (Heart), Vol.46, No.5, pp. 550-555, 2014 (in Japanese).
-  T. Aoki and H. Shimokawa, “7. Fifth Anniversary of the Great East Japan Earthquake – What Can We Learn from and What Should We Do in the Future?: Lessons from the Great East Japan Earthquake,” J. of JCS Cardiologists, Vol.24, No.2, pp. 258-264, doi: 10.1253/jjcsc.24.2_258, 2016 (in Japanese).
-  K. Abe, “Accidental Asphyxic Death,” J. of Tokyo Women’s Medical University, Vol.37, No.6, pp. 333-347, 1967 (in Japanese).