複合災害に立ち向かうために筑波研究学園都市の総力を挙げて取り組む研究プロジェクト

調査研究活動

特別セミナー等

【調査研究活動】 Tsukuba Global Science Week (@つくば国際会議場)に参加しました!

THANK YOU so much for your participation at the TGSW-2015 Joint Sessions on Natural Disasters Prevention and Resilience!

〇Joint Sessions
“Natural Disasters Prevention and Management” & “Disasters Prevention and Network Resilience”
〇日 時 / Date and Time
9月28日(月)、9月29日(火)、 9月30日(水);September 28, 29 ,30
〇場 所 / Place つくば国際会議場 、28日: 4階405会議室, 29日: 1階102会議室 International Congress Center (Epochal Tsukuba)

〇プログラム / Program
The “Tsukuba Global Science Week (TGSW), 2015″ Abstract Book can be downloaded from here.
28 September – presentations by invited foreign scientists
Morning Session (Conveners: Bogdan Enescu, Gaku Shoji)
10:15~10:30   Yuji Yagi (University of Tsukuba, Representative of “MegaQuake” project) Welcome Address
10:30~11:30 John Vidale (Depart. Earth & Space Sciences, Univ. of Washington, US) Anticipating the next great earthquake in the American Pacific Northwest
11:30~11:45 Break
11:45~12:15 David Marsan (Institute of Earth Science, Univ. of Savoy, France) Earthquakes promoted by aseismic deformation: seismic hazard implications
12:15~12:45 Jeffrey W Berman (Depart. Civil & Environmental Engineering, Univ. of Washington, US) Characterizing the response of structures to large subduction zone earthquakes
12:45~14:00 Lunch Break
Afternoon Session (Conveners: Hiroaki Kato, Tomomi Kito)
14:00~14:30 Marie Simon-Cornu (Institute for Radiological Protection and Nuclear Safety, France) Some insights into post-accidental radioecology
14:30~15:00 Stephanie Chang (School of Community & Regional Planning, Univ. of British Columbia, Canada) Modeling societal impacts of disasters: Progress and challenges
15:00~15:15 Break
15:15~15:45 Steve New (Saїd Business School, Univ. of Oxford, Great Britain) Supply network resilience: A review and a critique of recent research
15:45~16:15 Dirk Pieter van Donk (Faculty of Economics & Business, Univ. of Groningen, The Netherlands) Building resilient supply chains: the role of supply chain integration
29 September – presentations by lecturers from the University of Tsukuba; JICA
Morning Session (Conveners: Bogdan Enescu, Tomomi Kito)
09:15~09:45 Yuji Yagi (Faculty of Life and Environmental Sciences, Univ. of Tsukuba) MegaQuake Risk Management Project: A comprehensive approach towards mitigating earthquake-related disasters
09:45~10:15 Hiroaki Kato (Faculty of Life and Environmental Sciences, Univ. of Tsukuba) Radiocesium transfer and ambient dose rate in Japanese forest environment following the Fukushima accident
10:15~10:30 Break
10:30~10:35 Kyosuke Nagata (President, University of Tsukuba) Greetings
10:35~11:05 Noriko Suzuki (Director General, Secretariat of Japan Disaster Relief Team, Japan International Cooperation Agency (JICA)) JICA’s Emergency Disaster Relief
11:05~11:35 Tomomi Kito (Faculty of Engineering, Information and Systems, Univ. of Tsukuba) Supply network resilience: individual-level survivability vs network-level sustainability
11:35~12:05 Gaku Shoji (Faculty of Engineering, Information and Systems, Univ. of Tsukuba) Damage assessment of infrastructures subjected to the 2011 off the Pacific coast of Tohoku earthquake and tsunami
12:05~13:10 Lunch break
Afternoon Session (Conveners: Shigehiro Fujino, Michitaka Umemoto)
13:10~15:00 Post-doctoral Researchers & Students Poster presentations
15:00~15:20 Discussion among participants; remarks, suggestions for future cooperation
15:20~15:50 Student Poster Awards, Concluding remarks
30 September: field trip
Visit to areas affected by the 2011 M9.0 Tohoku-oki earthquake and tsunami.

〇当日の模様
9月28日–30日に開催された「Tsukuba Global Science Week 2015」に参加しました.本プロジェクトが参加したSession 7/8においては,海外の研究機関から招待した第一線の研究者による基調講演,本プロジェクトメンバーによる基調講演,学生・ポスドク研究者によるポスターセッション,本プロジェクトと海外の研究チームとの将来的なコラボレーションに関する積極的な議論を行いました.本セッションには70名にのぼる学生・研究者が参加し,海外からの招待講演者とともに活発な議論が行われました.30日には海外の研究者とともに2011年東北沖地震および津波による大きな被害を受けた茨城県,福島県の被災地を巡るツアーを行いました.

Our “Tsukuba Global Science Week” joint sessions 7/8 took place on 28 and 29 September 2015. The sessions constituted a great opportunity to discuss research and plan future collaborations with our invited foreign guests, word-wide recognized scientists in their field. About 70 people, including researchers and graduate students, attended the joint sessions. On September 30, we have organized a study tour at sites in Ibaraki and Fukushima Prefectures, which were affected by the 2011 Tohoku-oki earthquake and tsunami.

Day 1 (28 September 2015, Monday)
1日目は本プロジェクト代表である筑波大学八木勇治准教授による歓迎挨拶からセッションが始まりました.ワシントン大学 (アメリカ) のJohn Vidale教授による基調講演では,アメリカの北西部において発生の懸念されている巨大地震に関するお話,およびアメリカにて現在進行中の「M9」プロジェクト (発生の懸念されているマグニチュード9クラスの巨大地震のリスクマネジメントに関するプロジェクトhttp://m9.ess.washington.edu/public/M9_Home.html ) の紹介をしていただきました.サヴォア大学 (フランス) のDavid Marsan教授は巨大地震に先駆する非地震性すべりと地震ハザードの軽減に関するお話を伺いました.ワシントン大学のJeffery Berman准教授は,沈み込み帯で発生する巨大地震に対する構造物の応答に関する研究について基調講演をされました.「M9」プロジェクトの主任研究者であるVidale教授,Berman准教授とは巨大地震プロジェクトとの将来的なコラボレーションに関して大変有意義な議論を行うことができました.
The sessions started with the welcome address of Prof. Yuji Yagi, University of Tsukuba, the PI of the “MegaQuake Risk Management” project. His greetings were followed by the keynote lecture of Prof. John Vidale, University of Washington (US), on the next great earthquake in the American Pacific Northwest. The lecture also introduced the large project on mega-earthquake hazards mitigation, “M9”, which is currently on-going in the United States. The next talk was given by Prof. David Marsan, University of Savoy (France) on the aseismic deformations that may precede large earthquakes and seismic hazard implications. The last talk of the morning session was given by Prof. Jeffrey Berman, University of Washington, on the response of structures to large subduction zone earthquakes. Both Prof. Vidale and Prof. Berman are PI’s of the “M9” project and their visit to Tsukuba was an excellent opportunity to discuss possible near-future collaborations.

放射線防護・原子力安全研究所 (フランス) のMarie Simon-Cornu博士による放射線生態学に関する研究発表は,福島第一原子力発電所の事故およびそれに伴う環境への影響と密接に関連する基調講演でした.ブリティッシュコロンビア大学 (カナダ) のStephanie Chang教授には,地震災害がもたらす社会的な影響とその対応策に関する基調講演をしていただきました.オックスフォード大学 (イギリス) のSteve New教授,フローニンゲン大学 (オランダ) のDirk Pieter van Donk教授には,自然災害への防災対策に関する講演をしていただきました.
After the lunch break, Dr. Marie Simon-Cornu, from the Institute for Radiological Protection & Nuclear Safety (France) presented some insights into post-accidental radioecology, with a special emphasis on the on-going research related to the Fukushima nuclear accident and its environmental impact. The next invited talk was given by Prof. Stephanie Chang, University of British Columbia (Canada) on the societal impacts of disasters, current progress and challenges. The last two talks of the first day were dedicated to natural disasters resilience and given by Prof. Steve New, University of Oxford (Great Britain) and Prof. Dirk Pieter van Donk, from the University of Groningen (The Netherlands).

Day 2 (29 September 2015, Tuesday)
2日目は本プロジェクト代表の八木勇治准教授による巨大地震プロジェクトの概要と成果報告の後,生命環境系の加藤弘亮准教授,システム情報系の鬼頭朋見助教,庄司学准教授による防災あるいは減災に関する幅広い研究トピックの基調講演を頂きました.本セッションでは特別ゲストして筑波大学学長である永田恭介教授を迎え,参加者への歓迎挨拶を頂き,JICA国際緊急援助隊事務局長の鈴木規子氏の基調講演ではJICAによる国際的な緊急救助活動の内容を詳細にお話して頂きました.
We had the great honor to have the President of the University of Tsukuba, Prof. Kyosuke Nagata, to deliver his welcome greetings to our sessions participants. Moreover, as a special guest, Ms. Noriko Suzuki, Director General of the Secretariat of Japan Disaster Relief Team, Japan International Cooperation Agency (JICA) introduced JICA’s Emergency Disaster Relief efforts. The morning session started with the talk of Prof. Yuji Yagi, University of Tsukuba, who introduced some of the main research achievements during the “MegaQuake Risk Management” project and current challenges. Professors Hiroaki Kato, Tomomi Kito and Gaku Shoji (University of Tsukuba) introduced in the next talks various topics related with their disaster prevention and mitigation research.

午後には25名の生命環境系およびシステム情報系の学生・ポスドク研究者によるポスターセッションが行われました.発表者のうち3名が「Best Poster Presentation Award」に選ばれ,30日に行われたレセプションにおいて学長より表彰を受けました.
In the afternoon we had a poster session dedicated to post-doctoral researchers and student presentations; 25 presenters from the Faculties of Life and Environmantal Sciences and Engineering, Information and Systems introduced their research. The best three poster presentations were chosen for the “Best Poster Presentation Award”. The three winners were awarded and congratulated by the President of the University of Tsukuba, Prof. Kyosuke Nagata, at a special ceremony held on September 30.

Day 3 (30 September 2015, Wednesday)
3日目は海外の研究者とともに,2011年東北沖地震および津波による大きな被害をうけた茨城県,福島県の被災地を訪れました.福島復興局いわき支所の芳賀克男支所長に案内していただき,富岡町,楢葉町,Jヴィレッジ,広野町を訪れました.
We had departed early in the morning from Tsukuba in a study tour at sites in Ibaraki and Fukushima Prefectures, which were affected by the 2011 Tohoku-oki earthquake and tsunami. We had as a guide, Mr. Katsuo Haga, the top of the Iwaki Branch of the “Fukushima Reconstruction Agency”. The sites visited included the Tomioka city, the coastal areas of Naraha city, the J. Village and the Hirono city.

〇当日の写真
28 September – presentations by invited foreign scientists
Prof. Yuji Yagi Prof. John Vidale Prof. David Marsan
 
Prof. Jeffrey W Berman Dr. Marie Simon-Cornu Prof. Stephanie Chang
 
Prof. Steve New Prof. Dirk Pieter van Donk International Congress Center
 
29 September – presentations by lecturers from the University of Tsukuba; JICA
Prof. Kyosuke Nagata Prof. Yuji Yagi Prof. Hiroaki Kato
 
Ms. Noriko Suzuki Prof. Tomomi Kito Prof. Gaku Shoji
 
Poster presentations 1 Poster presentations 2 Group photo
 
30 September: field trip
Tomioka-machi Hamakaze Shotengai Reconstruction site
 
“Best Poster Presentation Award”
Nicolas Loffredo Ryo Okuwaki Suguru Endo

野田博之研究員(JAMSTEC)の特別セミナー (2013/7/5)

〇日時・会場
2013年7月5日(金)17:45~ ・筑波大学 総合研究棟B 108

〇発表内容
Speaker : 野田博之(独立行政法人海洋研究開発機構 地球内部ダイナミクス領域 沈み込み帯変動過程研究チーム)
タイトル:”Large nucleation before large earthquakes is sometimes skipped due to cascade-up – Implications from a rate- and state- simulation of faults with hierarchical asperities”
<要旨>
Does a large earthquake have a large quasi-static preparation? A hierarchical asperity model in which a large tough patch (Patch L) contains smaller fragile patches (Patch S) enables a large earthquake to start with only small preparation because of cascade-up rupture growth. We realized such a model in a rate-and-state framework by heterogeneous distributions of the state evolution distance, and its consequences are investigated by earthquake sequence simulations. Focus is put on elementary processes, the interaction between two scales: one Patch L containing one Patch S is simulated, with their size ratio as a parameter. If Patch S is larger than the nucleation size of Patch L, the system falls into a limit cycle consisting of only one earthquake that starts with Patch S nucleation and grows dynamically to rupture entire Patch L. If Patch S is considerably smaller than the nucleation size of Patch L, small earthquakes never dynamically cascade-up, and the large earthquakes are initiated by large quasi-static nucleation. In between, large earthquakes start in various ways: by large nucleation, dynamic cascade-up, or delayed cascade-up. In the final stage of quasi-static nucleation, the preseismic moment release rate increases roughly inversely proportional to the time-to-failure t_f with its amplitude depending on the nucleation size. Note this is the case with the aging law. For a Patch-S rupture to cascade up, strength in the adjacent region must have been reduced, manifested by a higher creep velocity before the Patch-S nucleation starts following 1/t_f acceleration. Large nucleation sometimes has a precursory small earthquake characterized by larger afterslip than non-precursory ones.

発表資料のダウンロードはこちらから