Modeling the Tsunami of 17 September 2015 in Chile
IRIDeS, Tohoku University, Tsunami engineering laboratory

Tsunami Source Model

Case 1

Fault origin (lat, lon) = (-71.752, -31.581)
Depth : 25.5 km
Fault Length / Width : 228 km / 86 km
Source Mechanism (Strike, Dip, Rake) = (353, 19, 83)
Slip : 3.3 m

Case 2

Fault origin (lat, lon) = (-71.752, -31.581)
Depth : 25.5 km
Fault Length / Width : 228 km / 86 km
Source Mechanism (Strike, Dip, Rake) = (180, 71, 92)
Slip : 3.3 m

Tsunami Propagation Model Movie Calculated by Tsunami Engineering Laboratory (preliminary result)

Case 1

Case 2

Geverning Equation : Linear Shallow Water Equations (Far-field model)
Numerical Scheme : Leap-frog Finite Difference Method (TUNAMI-CODE of Tohoku University)

Modeled Tsunami Height Distribution (preliminary result)

Maximum Tsunami Height Distribution(Case1)

aftershocks

Maximum Tsunami Height Distribution(Case2)

aftershocks

Modeled Tsunami Current Velocity Distribution (preliminary result)

Maximum Tsunami Current Velocity Distribution(Case1)

aftershocks

Maximum Tsunami Current Velocity Distribution(Case2)

aftershocks

Notice that color bar scale is small for visualization. The velocity become bigger at shallow grids.

Comparision of Tsunami Waveform

Observation Points

aftershocks

Case1

aftershocks

Case2

aftershocks

Geverning Equation : Non-Linear Shallow Water Equations (Far-field model)
Red line : Calculated wacefrom, Black line : Observed waveform (IOC)

Related Information

Seismology

USGS
Global CMT

Tsunami Observation

NOAA/PTWC
NOAA/NDBC
NOAA/NGDC
UNESCO/IOC

News

ABC
BBC
CNN
NHK (in Japanese)
Kahoku Shinpo (in Japanese)

*

by:

F. Imamura, L. Panon, N. David, A. Hisamatsu, A. Tanobe, F. Makinoshima, M. Watanabe, N. Togawa, N. Hasegawa

(Tsunami Engineering, Hazard and Risk Evaluation Research Division)

S. Sato

(Disaster Digital Archive, Disaster Information Management and Public Collaboration Division)

A. Hayashi and Y. Abe

(Earthquake induced Tsunami Risk Evaluation (Tokio Marine), Endowed Research Division)

A. Suppasri

(Disaster Potential Study Division)

K. Yamashita

(Science and technology for low-frequency Risk Evaluation Division)