Seismic Activity and Crustal Deformation after the 2011 Off the - PowerPoint PPT Presentation

J-RAPID Symposium March 6 - 7, 2013 Seismic Activity and Crustal Deformation after the 2011 Off the Pacific Coast of Tohoku Earthquake Y. Honkura Tokyo Institute of Technology Japan Science and Technology Agency

World Seismicity Map 1957 Mw9.1 1952 Mw9.0 Off the Pacific Coast of Tohoku Earthquake 2011 Mw9.0 1964 Mw9.2 2004 Mw9.0 2010 Mw8.8 1964 Mw9.5 Earthquake research Institute, Univ. Tokyo

Aftershock Area and Seismicity Triggered by the Mainshock 3/11 3/12 4/7 4/11 3/11 3/23 3/9 3/12 3/15 3/11 3/11 Japan Meteorological Agency

Aftershock Activity during Two Years M7.3 M7.3 M7.4 M7.5 M9.0 M7.2 M7.0 M7.6 Japan Meteorological Agency

Seismicity around the Aftershock Area during Two Years 2/25 2013 M6.3 Japan Meteorological Agency

Co-seismic Crustal Deformation (GEONET) T Nishimura et al., Earth Planets Space, 63, 631-636, 2011

New Technology for More Accurate Long-Term Forecast of Subduction-Zone Earthquakes GPS/Acoustic Seafloor Geodetic Observations Japan Coast Guard

Pre- and Co-seismic Crustal Displacements M. Sato, Japan Coast Guard

Steady Crustal Movements Caused by Subduction of Oceanic Plates (vs Eurasian plate) 40°N Japan Coast Guard Tohoku Univ. Nagoya Univ. 38°N 9.2cm/year (NUVEL-1A) 36°N Pacific Plate 34°N Approx. 4cm/year 5cm/year (Kotake et al. ， 1998) Philippine Sea Plate 32°N 134°E 136°E 138°E 140°E 142°E 144°E 146°E The velocity vectors detected by GPS/acoustic seafloor geodetic observations are generally consistent with those detected by on-land GPS measurements. M. Sato, Japan Coast Guard

Co-seismic Displacement off the Coast of Miyagi Prefecture Sato et al., Science, 19 May 2011

Co-seismic Fault Slip Model of GSI Estimated vertical displacement estimated from the model Geospatial Information Authority of Japan

Post-seismic Crustal Deformation (GEONET) Geospatial Information Authority of Japan

Post-seismic Fault Slip Model (GEONET) Geospatial Information Authority of Japan

Cumulative Seismic Moment Equivalent to Post-seismic Crustal Deformation March 12, 2001 – January 12, 2013 Geospatial Information Authority of Japan

Headquarters for Earthquake Research Promotion Director: Minister of Education, Culture, Sports, Science and Technology Ministry of Education, Culture, Sports, Policy Committee Science and technology (MEXT) Earthquake Research Committee Japan Meteorological Agency (JMA) Geographical Survey Institute (GSI) ① Planning of comprehensive and basic National Research Institute for Earth policies Science and Disaster Prevention (NIED) ② Coordination of budgets and other National Institute of Advanced Industrial administrative works with related Science and Technology (AIST) governmental organizations ③ Establishment of comprehensive survey Japan Coast Guard Japan Agency for Marine-Earth Science and observation plans ④ Collection, arrangement, analysis and and Technology (JAMSTEC) National institute of Information and comprehensive evaluation of survey Communications Technology (NICT) results by related governmental Universities organizations, universities, etc. ⑤ Public announcements based on the National Research Institute of Fire and Disaster comprehensive evaluations

National Seismic Hazard Maps for Japan Research of Active Faults Survey and Observation of Earthquakes Survey of Underground Structures The promotion of earthquake research － comprehensive and basic policy for the promotion of earthquake observations, surveys, measurements, and researches – Improvement of Methods to Evaluate( Predict) Strong Ground Motions Long-term Evaluation of the Occurrence of Earthquakes Seismic Hazard Map for Probabilistic Seismic Specified Seismic Hazard Map Source Faults The probability The seismic of ground motions equal to or higher intensities forecast for various than seismic intensity 6 Lower, regions around the Miura-hanto occurring within 30 years fault group. from the present. Upper or above These maps are expected to be used Seismic intensity ○ to raise the public's awareness of earthquake disaster reduction ○ to take the earthquake disaster reduction measures more effectively and efficiently 4 5 5 6 6 16 Lower Upper Lower ○ to evaluate the risks of establishing important facilities and enterprises in a certain area.

National Tsunami Hazard Map Plan of HERP Earthquakes in Japan Sea Earthquakes along Japan Trench Earthquakes along Earthquakes along Japan Trench Nankai Trough Ministry of Education, Culture, Sports, Science and Technology (MEXT)

Distribution of Hi-net and F-net Seismic Stations ☆ Epicenter of Main Shock Ｅｐｉｏ HERP (MEXT)

Seafloor Cable Network Plan of MEXT ・ Seismic Observations to improve earthquake early warning ・ Pressure Measurements to monitor vertical movement of seafloor and improve tsunami warning Seismometers Pressure Gauges Plate subduction Ministry of Education, Culture, Sports, Science and Technology (MEXT)

New Tsunami Warning System of JMA Japan Meteorological Agency http://www.seisvol.kishou.go.jp/eq/eng/tsunami/tsunamiwarning_leaflet.pdf