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Visualization of Seismic Wave Propagation
-Dense Seismic Network and Computer Simulation地震波伝播の可視化ー高密度観測と計算機シミュレーションー
Takashi FURUMURA 古村孝志
Center for Integrated Disaster Information Research, University of Tokyo
Earthquake Research Institute, University of Tokyo
東京大学総合防災情報研究センター/東京大学地震研究所
High-density seismic network and the Earth Simulator
2. Earth Simulator Supercomputer
5120 CPU, 40TFLOPS, JAMSTEC
1. Nation-wide seismic network
K-NET, KiK-net, 1800 Stations, NIED
Large-scale computer simulation of ground motion
FDM Simulation of
equation of motions
..
U p 
Source and Structural models
Western Tottori Earthquake in 2000
 xp
x
 U

 yp
y
U
 zp
z
U 
 fp
 U
U 
y
p
q
x
z
 pq   

 pq   




x

y

z

q

p




Yagi and Kikuchi (2001)
Large-scale parallel
simulation
領域分
地下構造デル

Ground motions from the Western Tottori earthquake in 2000:
Observation and Computer simulation
鳥取県西部地震の高密度地震観測とシミュレーション
Dense seismic network and
Ground motion
高密度地震観測地面の揺れ
Furumura et al., 2003
Computer simulation of
Ground motion
コンピュータシミュレーション
Large-scale computer simulation of ground motion地震動計算
2.FDM Simulation of
equation of motions
..
U p 
1.Source and Structural models
Western Tottori Earthquake in 2000
 xp
x
 U

 yp
y
U
 zp
z
U 
 fp
 U
U 
y
p
q
x
z
 pq   

 pq   




x

y

z

q

p




Yagi and Kikuchi (2001)
3.Large-scale parallel
simulation
領域分
地下構造デル

Long-period ground motion from large earthquake大地震の長周期地震動
Observed ground motion from
Dense, nation-wide seismic network,
1800 stations.
高密度地震観測（1800点）で見る揺れ
Tomakomai 苫小牧
2003 Tokachi-oki (M8.0)
2004 Chuetsu (M6.8)
2008 Iwate-Miyagi (M7.2)
Tokyo 東京
2004 Off Kii-Peninsula (M7.4)
2004 Chuetsu Earthquake: Computer Simulation 中越地震の計算
Long-period ground motions developed in
the center of Tokyo basin ; amplification
and focusing of seismic waves in thick
sediments
関東平野の堆積層で長周期地震動が強く増
幅されることを計算から確認
Simulation
Observation
Furumura and Hayakawa (2007)
Validation of simulation model for Nankai-Trough earthquake
南海トラフ地震のシミュレーションモデルの検証
東金
Togane
煤書き地震記録紙
Smoked paler record
Togane
Simul
ation
Obser
vation
Tokyo
大手町
計算
東金
観測
東南海地震
Furumura et al. (2008)
Integrated Simulation for Disaster Mitigation 連成計算の
Buildings Oscillation 建物の揺れ
For mitigating earthquake disasters
expecting for future Nankai Trough
Earthquakes, integration of computer
simulations such as for building
oscillation and tsunami simulation is
necessary 災害予測には、建物震動・津波
シミュレーションとの連成が必要
Tsunami Simulation 津波シミュレーション
Ground Motion Simulation 地震動計算
Future Nankai-Trough M8 Earthquake 南海トラフ巨大地震
Large M8 earthquakes occur at the Nankai
Trough at interval of about 100 years, and
next event should occur in 30 years
今後30年以内に、次の南海・東南海M8地震発生
揺れの予測
Expecting disasters from the Nankai-Trough earthquake
南海トラフ地震の影響
Real-scale shaking-table tests demonstrating
significant impacts of long-period ground
motions to high-rise buildings
実大震動台実験による、長周期地震動の超
高層ビルに与える影響
Movie: courtesy from the real-scale shaking table
test of NIED 防災科学技術研究所
Integrated Simulation Seismic Wave and Tsunami地震と津波の連成計算
3
Propagation of tsunami is also
calculated by FDM simulation of
NS. equations
津波伝播も、3-D NS方程式のFDM
計算により評価
Sea surface
3-D N-S equations
2
1
Initial tsunami on sea surface
calculated by FDM simulation of
N.S. equations
初期津波（水面上昇）は、3-D NS
方程式のFDM計算により評価
Seafloor deformation is
estimated by FDM
simulation of eq. motions
海底地殻変動は、3D運動方
程式のFDM計算により評価
Furumura and Saito (2008)
  2u  2u  2u 
u
u
u
u
p
u
v
w

  2  2  2   g x
t
x
y
z
x
y
z 
 x
  2v  2v  2v 
v
v
v
v
p
u
v
w

  2  2  2   g y
t
x
y
z
y
y
z 
 x
 2w 2w 2w
w
w
w
w
p
u
v
w

  2  2  2   g z
t
x
y
z
z
y
z 
 x
Equation of Motion in 3D
 xx  xy  xz


 fx,
x
y
z
 yz  yy  yz
y 
u


 fy,
x
y
z
 xz  yz  zz
z 
u


 fz.
x
y
z
u v w


0
x y z
Seabed
x 
u
 pq   (exx  eyy  ezz ) pq  2 epq
Furumura and Saito (2009)
3D Model
Ground motion and Tsunami Simulation: 1896 Meiji-Sanriku
Earthquake 1896年明治三陸地震
Ground motion simulation
Tsunami Simulation
連成
Coupling
P
S
Ground motion
地震動
Rayleigh
Tsunami
津波
Furumura and Saito (2009)
Large-scale parallel simulation using super-parallel computers
超並列スパコンによる大規模シミュレーション (A)Vector-type super
computer
ベクトル型スパコン
Parallel Speed-up : Ground motion
Simulation
地震動シミュレーション：並列計算効率
Actual
Performance
実効性能 >
50%
Actual
Performance
実効性能
～ 8%
New Earth Simulator
新地球シミュレータ（2009）
（131TFLOPS)
Earth Simualtor
地球シミュレータ（2002）
40 TFLOPS
(B)Scalar-type Super
ocmputer
スカラー型スパコン
Peta-flops “Keisoku”
Computer京速計算機（2012～）
（10PFLOPS?)
T2K Opeen Super computer
u  Tokyo)東大T2K
u   u  p   u  g
(Univ.
2008 (140TFLOPS)

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