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The Mw9.0 Tōhoku Earthquake and Tsunami of 11Th March 2011 a Field Report by Eefit

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The Mw9.0 Tōhoku Earthquake and Tsunami of 11Th March 2011 a Field Report by Eefit THE MW9.0 TŌHOKU EARTHQUAKE AND TSUNAMI OF 11TH MARCH 2011 A FIELD REPORT BY EEFIT THE MW9.0 TŌHOKU EARTHQUAKE AND TSUNAMI OF 11TH MARCH 2011 A FIELD REPORT BY EEFIT Mr. Antonios Pomonis, CAR Limited, Global Earthquake Model (Team Leader) Dr. Keiko Saito, CAR Limited, Willis Research Fellow (Deputy Team Leader) Mr. Stuart Fraser, Massey University / GNS Science Joint Centre for Disaster Research (Editor) Mr. Siau Chen Chian, University of Cambridge Dr. Katsu Goda, University of Bristol Mr. Joshua Macabuag, Building Design Partnership Mr. Mark Offord, Sellafield Ltd Dr. Alison Raby, Plymouth University Prof. Peter Sammonds, Institute for Risk & Disaster Reduction, University College London Report prepared in association with: Dr. Eri Gavanski, Tōhoku University Dr. Maki Koyama, Kyoto University Prof. Hitomi Murakami, Yamaguchi University Report reviewed by: Dr. Tiziana Rossetto, University College London Dr. Damian Grant, Arup Dr. John E. Alarcon, Willis th The Mw9.0 Tohoku earthquake and tsunami of 11 March 2011 ii Acknowledgements The EEFIT Japan team would like to express our sincere thanks to the many following organisations and individuals for their support prior, during and following this mission, without whom we would not have been able to carry out the field trip and research so effectively. Ms. Berenice Chan, Institution of Structural Engineers Professor David Cope, Director, Parliamentary Office of Science and Technology Mr. Tomonori Goto, PASCO Mr. Ryota Hamamoto, Mr. Yasumasa Matsunaga, ESRI-J Professor Hideyuki Horii and Dr Riki Honda, Tokyo University Professor Fumihiko Imamura, Abdul Muhari and Dr. Anawat Suppasri, Disaster Control Centre, Tōhoku University Mr. Go Ishikawa, GIS NEXT Dr. Aiming Lin, Shizuoka University Dr. Lee Manjae, Sendai National College of Technology Professor Akira Mano, Japan Society of Civil Engineers and Disaster Control Centre, Tōhoku University Mr. Akihito Morikawa, Miyagi Prefecture Government official Michaela Musilova, University College London Dr Alessio Patalano, Kings College London Dr. Rui Pinho, Dr. Helen Crowley, Global Earthquake Model Mr. Chris Pook, Mr. Kevin Knappett, Ms. Naomi Takegoshi, British Embassy Tokyo Mr. John Riding, Sellafield Ltd. Mr. KenTarō Sakagawa, Mr. Akira Marusaki, Mr. Koichi Sanefuji, Mr. Yushi Matsumoto, Mr. Hisanaga, Okuyama, Japanese Self Defence Force Mr. Satoshi Sugai, Japanese Red Cross Professor David Tappin, British Geological Survey Mr. Shoji Yamada, Tsutomu Kawabata, Mr. Noritoshi Kamagata, Professor Shibayama, Waseda University Mr. Mamoru Yamada, Kamaishi City, Officials of Natori City, Ōfunato City and Rikuzentakata City Kokusai Kogyo KK Thanks are also due to the following organisations for funding the participation of team members: EEFIT and the Global Earthquake Model, for funding Antonios Pomonis EPSRC for funding Dr. Alison Raby, Dr. Katsu Goda and Siau Chen Chian Aon Benfield for funding Stuart Fraser Institution of Civil Engineers QUEST Travel Award and Building Design Partnership for funding Joshua Macabuag Sasakawa Foundation for funding Professor Peter Sammonds Sellafield Ltd. for funding Mark Offord Willis Research Network, Cambridge Architectural Research Ltd. and Department of Architecture, University of Cambridge for funding Dr. Keiko Saito EEFIT would like to acknowledge the ongoing support of its corporate sponsors: AIR Worldwide, Aon Benfield, Arup, British Geological Survey, CREA Consultants, Malishev Wilson Engineers, Risk Management Solutions and Sellafield Ltd . th The Mw9.0 Tohoku earthquake and tsunami of 11 March 2011 iii Contents Acknowledgements ................................................................................................................................................. iii Contents ................................................................................................................................................................. iv List of figures .......................................................................................................................................................... vii List of tables .......................................................................................................................................................... xv 1. Introduction ............................................................................................................................................... 1 1.1. Preamble .................................................................................................................................................. 1 1.2. The EEFIT Tōhoku mission ...................................................................................................................... 2 1.3. Japanese collaboration ............................................................................................................................. 5 1.4. References ............................................................................................................................................... 7 2. The earthquake of 11th March 2011 .......................................................................................................... 8 2.1. Rupture zone and tectonics of the Japan Trench ..................................................................................... 8 2.2. Historical seismicity and tsunami in the Japan Trench ............................................................................. 9 2.3. Earthquake rupture mechanism and tsunami generation........................................................................ 11 2.4. Economic loss due to the earthquake and tsunami ................................................................................ 13 2.5. Conclusions on the earthquake of 11th March 2011 ................................................................................ 15 2.6. References ............................................................................................................................................. 16 3. Earthquake ground motion report ........................................................................................................... 19 3.1. Ground motions of the MW9.0 mainshock and major aftershocks ........................................................... 19 3.2. Ground motion characteristics ................................................................................................................ 21 3.2.1. Specific cases ................................................................................................................................. 22 3.2.2. General cases ................................................................................................................................. 25 3.3. Comparison of ground motions with past significant events ................................................................... 27 3.4. Damage potential of long duration ground motions ................................................................................ 29 3.5. Conclusions on ground motion ............................................................................................................... 31 3.6. References ............................................................................................................................................. 32 4. Field observations on ground shaking damage ...................................................................................... 34 4.1. Building regulations in Japan .................................................................................................................. 34 4.2. Composition of building stock ................................................................................................................. 34 4.3. Field Observations .................................................................................................................................. 36 4.3.1. Overall damage statistics ................................................................................................................ 38 4.3.2. Damage survey in Sendai, Miyagi Prefecture ................................................................................. 40 4.3.3. Damage survey in Shirakawa, Fukushima Prefecture ..................................................................... 42 4.3.4. Damage survey in Sukagawa, Fukushima Prefecture ..................................................................... 44 4.4. Conclusions on ground shaking damage ................................................................................................ 47 4.5. References ............................................................................................................................................. 48 5. The 11th March 2011 tsunami and its impact .......................................................................................... 50 5.1. Tsunami terminology............................................................................................................................... 50 5.2. Coastal morphology and bathymetry in the affected region .................................................................... 51 5.3. Coastal defences in Japan ...................................................................................................................... 52 5.4. Tsunami severity ....................................................................................................................................
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