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Advanced ocean floor observatory for mega-thrust earthquakes and tsunamis around the Nankai Trough, Southwestern Japan Yoshiyuki KANEDA DONET GROUP Department.

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Presentation on theme: "Advanced ocean floor observatory for mega-thrust earthquakes and tsunamis around the Nankai Trough, Southwestern Japan Yoshiyuki KANEDA DONET GROUP Department."— Presentation transcript:

1 Advanced ocean floor observatory for mega-thrust earthquakes and tsunamis around the Nankai Trough, Southwestern Japan Yoshiyuki KANEDA DONET GROUP Department of Oceanfloor Network System Development for Earthquakes and Tsunamis DONET Japan Agency for Marine-Earth Science ant Technology JAMSTEC

2 Previous research in the Nankai trough NANKAI TROUGH KII peninsula year age ABC 1605 KEICHO 1707 HOUEI 1854 ANSEI 1944 SYOWA 1946 SYOWA Historical EQs. in the Nankai trough A;Nankai EQ. B;Tonankai EQ. C;Tokai EQ. PSP

3 TonankaiTokaiNankai 111 years 7days 103 years 97days 103years 97days TonankaiNankai 111 years 7days Tonankai Tokai Nankai Tonankai Nankai The results of mega-thrust EQ. recurrence cycle simulation in the Nankai trough

4 Advanced Ocean Floor Cable System Outline & Concept Image

5 Ocean floor cable network system as MEXT project Sensors over20 Seismometers 20 Pressure gauges

6 Backbone cable system Brunch unit Sensor system Extendable Advanced Sensor System Replaceable Observatory Node High Reliability Backbone Cable System Landing Station Seismometers, Pressure gauge Outline of ocean floor cable system

7 Speedy evaluation and notification for earthquakes and tsunamis. Provide observed data such as ocean floor deformation derived from pressure gauges to improve the simulation and modeling researches about the mega- thrust earthquakes. (Data assimilation) Understanding of the interaction between the crust and upper mantle around subduction zone. Data Application

8 Maintenance systems of JAMSTEC Class ROV HYPER-DOLPHIN class deep sea ROV KAIKO7000 Deep Sea Cruising AUV URASHIMA

9 Network Array Planning Advanced Ocean Floor Cable System

10 Network array planning Kii Peninsula Tonankai Seisomogenic Zone Nankai Seisomogenic Zone sensor node Back bone cable

11 Advanced Ocean Floor Cable System Image

12 The resolution test of hypocenter determination using oceanfloor network Network Array Good resolution!!

13 Land GPS and Pressure gauge Resolution Land GPS horizontal; 1mm vertical; 3mm Pressure gauges: 10mm Ocean network system(36 pressure gauges)+ Land GPS The checker board test for offshore geodetic data analyses Land GPSModel 40 square checker board Slip rate : ±1m Good resolution!! Around network array

14 Advanced Ocean Floor Cable System Sensors Multi seismometers for Broad band phenomena Strong Motion Micro EQs. Precise pressure gauges for Tsunami Ocean floor deformation Data s o function at the trouble Under development Precise ocean floor deformation monitoring system Advanced in lined sensor cable system

15 Provide the estimated results before arriving seismic wave in populated area Observe seismic wave by network Magnitude Focal mechanism Asperity area Synthetic waveform Research on real time estimation of source elements using network data (regional analysis) K-net Ocean floor network Tonankai Eq. Analyze with theoretical data Database Gather data Construct source model and pre-estimate Tsunami waveform Analyze Structure model by JAMSTEC

16 Improve simulation model Data assimilation using pressure gauge data as ocean floor deformation monitoring Keyword: Long term observatory Improve the simulation model

17 Observation data Data assimilation Predict 2 Predict (n) Time range for data assimilation Optimization time Long-term predict using predict (n) time Without improvement Improvement Improvement Simulation model

18 Network data flow Network Land Station JAMSTEC Data center JMA Others analyses

19 Advanced Ocean Floor Cable System Image

20 Ocean floor cable network system as MEXT project Sensors over20 Seismometers 20 Pressure gauges Project FY2006-FY2009 4 years

21 System Concept Redundancy, Extension and advanced maintenance system using the looped cable system, junction boxes and the ROV/AUV etc. Speedy evaluation and notification for earthquakes and tsunamis. Provide observed data such as ocean floor deformation derived from pressure gauges to improve the simulation and modeling researches about the mega-thrust earthquakes. Understanding of the interaction between the crust and upper mantle around subduction zone. Data Application Keywords: Landing both cable end, Node, Brunch unit

22 Nicoya Osa Future Plan?? Ocean floor cable network system

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