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Papers by Yuichiro Tanioka

Research paper thumbnail of Prevention of Hypothermia in the Aftermath of Natural Disasters in Areas at Risk of Avalanches, Earthquakes, Tsunamis and Floods

Research paper thumbnail of Effects of the 17th century great Hokkaido tsunami on Tohoku regions

Japan Geoscience Union, 2015

Research paper thumbnail of A large slip area of the 1854 Ansei-Tokai earthquake estimated from an observed tsunami waveform at San Francisco

Japan Geoscience Union, 2018

The great earthquakes have repeatedly occurred at the Nankai Trough subduction zone and caused se... more The great earthquakes have repeatedly occurred at the Nankai Trough subduction zone and caused severe disasters in southwest Japan. Previous studies indicated that the 1944 Tonankai earthquake re-ruptured the large slip area of the 1854 Ansei Tokai earthquake except the plate interface along the Sagami trough (Tokai area). The slip distribution of the 1944 Tonankai earthquake has been studied vigorously using the seismograms of regional strong ground motions and teleseismic waveforms, geodetic data derived from leveling surveys and tide gauge records of tsunami waveforms. However, those instrumental data were not available in 1854. The source process of the 1854 Ansei Tokai earthquake have been only studied from descriptions of earthquake phenomenon in ancient documents such as shaking felt by humans, damage to houses, visual measurements of tsunami inundation or tsunami runup height, and visual measurements of coseismic crustal deformation data. Therefore, the detailed slip distrib...

Research paper thumbnail of Tsunami simulation method assimilating ocean bottom pressure data for real-time tsunami forecast; A case study for the 1968 great earthquake

Due to a serious disaster caused by the 2011 Tohoku-oki tsunami, improvement of the tsunami forec... more Due to a serious disaster caused by the 2011 Tohoku-oki tsunami, improvement of the tsunami forecast has been an urgent issue in Japan. National Institute of Disaster Prevention installed a cable network system of earthquake and tsunami observation (S-NET) at the ocean bottom along the Japan and Kurile trench. This cable system includes 150 pressure sensors (tsunami meters) which are separated by 30 km. The system is the densest tsunami observation network in the world.

Research paper thumbnail of A new approach for tsunami early warning using tsunami observations in a source region

Research paper thumbnail of Tsunami simulation method initiated from waveforms observed by ocean bottom pressure sensors for real-time tsunami forecast; Applied for 2011 Tohoku-oki Tsunami

Japan Geoscience Union, 2016

Research paper thumbnail of Frequency dispersion amplifies tsunamis caused by outer-rise normal faults

Scientific Reports, 2021

Although tsunamis are dispersive water waves, hazard maps for earthquake-generated tsunamis negle... more Although tsunamis are dispersive water waves, hazard maps for earthquake-generated tsunamis neglect dispersive effects because the spatial dimensions of tsunamis are much greater than the water depth, and dispersive effects are generally small. Furthermore, calculations that include non-dispersive effects tend to predict higher tsunamis than ones that include dispersive effects. Although non-dispersive models may overestimate the tsunami height, this conservative approach is acceptable in disaster management, where the goal is to save lives and protect property. However, we demonstrate that offshore frequency dispersion amplifies tsunamis caused by outer-rise earthquakes, which displace the ocean bottom downward in a narrow area, generating a dispersive short-wavelength and pulling-dominant (water withdrawn) tsunami. We compared observational evidence and calculations of tsunami for a 1933 Mw 8.3 outer-rise earthquake along the Japan Trench. Dispersive (Boussinesq) calculations pred...

Research paper thumbnail of Characteristics of landslides caused by the 2018 Hokkaido Eastern Iburi Earthquake

Research paper thumbnail of Numerical simulation of the landslide and tsunami due to the 1741 Oshima-Oshima eruption in Hokkaido, Japan

Journal of Geophysical Research: Solid Earth, 2019

Research paper thumbnail of Tsunami Simulation Method Assimilating Ocean Bottom Pressure Data Near a Tsunami Source Region

Pure and Applied Geophysics, 2017

Research paper thumbnail of Simulation of a Dispersive Tsunami due to the 2016 El Salvador–Nicaragua Outer-Rise Earthquake (Mw 6.9)

Pure and Applied Geophysics, 2018

The 2016 El Salvador-Nicaragua outer-rise earthquake (M w 6.9) generated a small tsunami observed... more The 2016 El Salvador-Nicaragua outer-rise earthquake (M w 6.9) generated a small tsunami observed at the ocean bottom pressure sensor, DART 32411, in the Pacific Ocean off Central America. The dispersive observed tsunami is well simulated using the linear Boussinesq equations. From the dispersive character of tsunami waveform, the fault length and width of the outer-rise event is estimated to be 30 and 15 km, respectively. The estimated seismic moment of 3.16 9 10 19 Nm is the same as the estimation in the Global CMT catalog. The dispersive character of the tsunami in the deep ocean caused by the 2016 outer-rise El Salvador-Nicaragua earthquake could constrain the fault size and the slip amount or the seismic moment of the event.

Research paper thumbnail of Method to Determine Appropriate Source Models of Large Earthquakes Including Tsunami Earthquakes for Tsunami Early Warning in Central America

Pure and Applied Geophysics, 2017

Research paper thumbnail of Introduction to “Global Tsunami Science: Past and Future, Volume I”

Pure and Applied Geophysics, 2016

Research paper thumbnail of Field Survey of the 2003 Tokachi-Oki Earthquake Tsunami and Simulation at the Ootsu Harbor Located at the Pacific Coast of Hokkaido, Japan

Advances in Natural and Technological Hazards Research

Research paper thumbnail of Fault model of the 2007 Solomon earthquake estimated from the crustal deformation survey data

Research paper thumbnail of Tsunami run-up heights of the 2004 off the Kii peninsula earthquakes

Earth, Planets and Space, 2005

A tsunami height survey was conducted immediately after the 2004 off the Kii peninsula earthquake... more A tsunami height survey was conducted immediately after the 2004 off the Kii peninsula earthquakes. Results of the survey show that the largest tsunami height was about 4.6 m locally at Kiho-cho, Mie prefecture. Numerical simulation of the tsunami due to the earthquake was carried out using the model parameters estimated by NIED. The distribution pattern of the observed tsunami heights along the coast cannot be explained by the computed heights, because the model equation is linear long-wave theory and the run-up computations with a finer grid system are not included in this simulation. In order to explain tsunami run-up heights, it is necessary that the non-linear and run-up computation model should be used with a finer grid system.

Research paper thumbnail of Tsunami run-up heights of the 2003 Tokachi-oki earthquake

Earth, Planets and Space, 2004

Research paper thumbnail of Slip distribution of the 2011 Tohoku-oki earthquake

Research paper thumbnail of Rupture process of the 2004 great Sumatra-Andaman earthquake estimated from tsunami waveforms

Earth, Planets and Space, 2006

Rupture process of the 2004 Sumatra-Andaman earthquake is estimated using tsunami waveforms obser... more Rupture process of the 2004 Sumatra-Andaman earthquake is estimated using tsunami waveforms observed at tide gauges and the coseismic vertical deformation observed along the coast. The average rupture speed of the 2004 Sumatra-Andaman earthquake is estimated to be 1.7 km/s from tsunami waveform analysis. The rupture extends about 1200 km toward north-northwest along the Andaman trough. The largest slip of 23 m is estimated on the plate interface off the northwest coast in the Aceh province in Sumatra. Another large slip of 21 m is also estimated on the plate interface beneath the north of Simeulue Island in Indonesia. The other large slip of 10–15 m is estimated on the plate interface near Little Andaman and Car Nicobar Inlands. The total seismic moment is calculated to be 7.2 × 1022 Nm (Mw 9.2) which is similar to the other studies using seismic waves (Park et al., 2005; Ammon et al., 2005).

Research paper thumbnail of Review of Tide Gauge Records in the Indian Ocean

Journal of Earthquake and Tsunami, 2009

According to the NOAA earthquake database, at least 31 events have been found in the Indian Ocean... more According to the NOAA earthquake database, at least 31 events have been found in the Indian Ocean in terms of tsunami event since 1900, most of which occurred along the Sunda Trench. In this study, we review the history of tide level measurements and their datasets archives in Thailand, Indonesia, India, and Australia. We collected tide gauge paper charts recording historical tsunamis including the 2004 Indian Ocean tsunami in those countries. As a result, systematic collection of historical tsunami records by tide gauges in the Indian Ocean has been difficult, because few tsunamigenic earthquakes occurred in the Indian Ocean during the instrumentally observed period.

Research paper thumbnail of Prevention of Hypothermia in the Aftermath of Natural Disasters in Areas at Risk of Avalanches, Earthquakes, Tsunamis and Floods

Research paper thumbnail of Effects of the 17th century great Hokkaido tsunami on Tohoku regions

Japan Geoscience Union, 2015

Research paper thumbnail of A large slip area of the 1854 Ansei-Tokai earthquake estimated from an observed tsunami waveform at San Francisco

Japan Geoscience Union, 2018

The great earthquakes have repeatedly occurred at the Nankai Trough subduction zone and caused se... more The great earthquakes have repeatedly occurred at the Nankai Trough subduction zone and caused severe disasters in southwest Japan. Previous studies indicated that the 1944 Tonankai earthquake re-ruptured the large slip area of the 1854 Ansei Tokai earthquake except the plate interface along the Sagami trough (Tokai area). The slip distribution of the 1944 Tonankai earthquake has been studied vigorously using the seismograms of regional strong ground motions and teleseismic waveforms, geodetic data derived from leveling surveys and tide gauge records of tsunami waveforms. However, those instrumental data were not available in 1854. The source process of the 1854 Ansei Tokai earthquake have been only studied from descriptions of earthquake phenomenon in ancient documents such as shaking felt by humans, damage to houses, visual measurements of tsunami inundation or tsunami runup height, and visual measurements of coseismic crustal deformation data. Therefore, the detailed slip distrib...

Research paper thumbnail of Tsunami simulation method assimilating ocean bottom pressure data for real-time tsunami forecast; A case study for the 1968 great earthquake

Due to a serious disaster caused by the 2011 Tohoku-oki tsunami, improvement of the tsunami forec... more Due to a serious disaster caused by the 2011 Tohoku-oki tsunami, improvement of the tsunami forecast has been an urgent issue in Japan. National Institute of Disaster Prevention installed a cable network system of earthquake and tsunami observation (S-NET) at the ocean bottom along the Japan and Kurile trench. This cable system includes 150 pressure sensors (tsunami meters) which are separated by 30 km. The system is the densest tsunami observation network in the world.

Research paper thumbnail of A new approach for tsunami early warning using tsunami observations in a source region

Research paper thumbnail of Tsunami simulation method initiated from waveforms observed by ocean bottom pressure sensors for real-time tsunami forecast; Applied for 2011 Tohoku-oki Tsunami

Japan Geoscience Union, 2016

Research paper thumbnail of Frequency dispersion amplifies tsunamis caused by outer-rise normal faults

Scientific Reports, 2021

Although tsunamis are dispersive water waves, hazard maps for earthquake-generated tsunamis negle... more Although tsunamis are dispersive water waves, hazard maps for earthquake-generated tsunamis neglect dispersive effects because the spatial dimensions of tsunamis are much greater than the water depth, and dispersive effects are generally small. Furthermore, calculations that include non-dispersive effects tend to predict higher tsunamis than ones that include dispersive effects. Although non-dispersive models may overestimate the tsunami height, this conservative approach is acceptable in disaster management, where the goal is to save lives and protect property. However, we demonstrate that offshore frequency dispersion amplifies tsunamis caused by outer-rise earthquakes, which displace the ocean bottom downward in a narrow area, generating a dispersive short-wavelength and pulling-dominant (water withdrawn) tsunami. We compared observational evidence and calculations of tsunami for a 1933 Mw 8.3 outer-rise earthquake along the Japan Trench. Dispersive (Boussinesq) calculations pred...

Research paper thumbnail of Characteristics of landslides caused by the 2018 Hokkaido Eastern Iburi Earthquake

Research paper thumbnail of Numerical simulation of the landslide and tsunami due to the 1741 Oshima-Oshima eruption in Hokkaido, Japan

Journal of Geophysical Research: Solid Earth, 2019

Research paper thumbnail of Tsunami Simulation Method Assimilating Ocean Bottom Pressure Data Near a Tsunami Source Region

Pure and Applied Geophysics, 2017

Research paper thumbnail of Simulation of a Dispersive Tsunami due to the 2016 El Salvador–Nicaragua Outer-Rise Earthquake (Mw 6.9)

Pure and Applied Geophysics, 2018

The 2016 El Salvador-Nicaragua outer-rise earthquake (M w 6.9) generated a small tsunami observed... more The 2016 El Salvador-Nicaragua outer-rise earthquake (M w 6.9) generated a small tsunami observed at the ocean bottom pressure sensor, DART 32411, in the Pacific Ocean off Central America. The dispersive observed tsunami is well simulated using the linear Boussinesq equations. From the dispersive character of tsunami waveform, the fault length and width of the outer-rise event is estimated to be 30 and 15 km, respectively. The estimated seismic moment of 3.16 9 10 19 Nm is the same as the estimation in the Global CMT catalog. The dispersive character of the tsunami in the deep ocean caused by the 2016 outer-rise El Salvador-Nicaragua earthquake could constrain the fault size and the slip amount or the seismic moment of the event.

Research paper thumbnail of Method to Determine Appropriate Source Models of Large Earthquakes Including Tsunami Earthquakes for Tsunami Early Warning in Central America

Pure and Applied Geophysics, 2017

Research paper thumbnail of Introduction to “Global Tsunami Science: Past and Future, Volume I”

Pure and Applied Geophysics, 2016

Research paper thumbnail of Field Survey of the 2003 Tokachi-Oki Earthquake Tsunami and Simulation at the Ootsu Harbor Located at the Pacific Coast of Hokkaido, Japan

Advances in Natural and Technological Hazards Research

Research paper thumbnail of Fault model of the 2007 Solomon earthquake estimated from the crustal deformation survey data

Research paper thumbnail of Tsunami run-up heights of the 2004 off the Kii peninsula earthquakes

Earth, Planets and Space, 2005

A tsunami height survey was conducted immediately after the 2004 off the Kii peninsula earthquake... more A tsunami height survey was conducted immediately after the 2004 off the Kii peninsula earthquakes. Results of the survey show that the largest tsunami height was about 4.6 m locally at Kiho-cho, Mie prefecture. Numerical simulation of the tsunami due to the earthquake was carried out using the model parameters estimated by NIED. The distribution pattern of the observed tsunami heights along the coast cannot be explained by the computed heights, because the model equation is linear long-wave theory and the run-up computations with a finer grid system are not included in this simulation. In order to explain tsunami run-up heights, it is necessary that the non-linear and run-up computation model should be used with a finer grid system.

Research paper thumbnail of Tsunami run-up heights of the 2003 Tokachi-oki earthquake

Earth, Planets and Space, 2004

Research paper thumbnail of Slip distribution of the 2011 Tohoku-oki earthquake

Research paper thumbnail of Rupture process of the 2004 great Sumatra-Andaman earthquake estimated from tsunami waveforms

Earth, Planets and Space, 2006

Rupture process of the 2004 Sumatra-Andaman earthquake is estimated using tsunami waveforms obser... more Rupture process of the 2004 Sumatra-Andaman earthquake is estimated using tsunami waveforms observed at tide gauges and the coseismic vertical deformation observed along the coast. The average rupture speed of the 2004 Sumatra-Andaman earthquake is estimated to be 1.7 km/s from tsunami waveform analysis. The rupture extends about 1200 km toward north-northwest along the Andaman trough. The largest slip of 23 m is estimated on the plate interface off the northwest coast in the Aceh province in Sumatra. Another large slip of 21 m is also estimated on the plate interface beneath the north of Simeulue Island in Indonesia. The other large slip of 10–15 m is estimated on the plate interface near Little Andaman and Car Nicobar Inlands. The total seismic moment is calculated to be 7.2 × 1022 Nm (Mw 9.2) which is similar to the other studies using seismic waves (Park et al., 2005; Ammon et al., 2005).

Research paper thumbnail of Review of Tide Gauge Records in the Indian Ocean

Journal of Earthquake and Tsunami, 2009

According to the NOAA earthquake database, at least 31 events have been found in the Indian Ocean... more According to the NOAA earthquake database, at least 31 events have been found in the Indian Ocean in terms of tsunami event since 1900, most of which occurred along the Sunda Trench. In this study, we review the history of tide level measurements and their datasets archives in Thailand, Indonesia, India, and Australia. We collected tide gauge paper charts recording historical tsunamis including the 2004 Indian Ocean tsunami in those countries. As a result, systematic collection of historical tsunami records by tide gauges in the Indian Ocean has been difficult, because few tsunamigenic earthquakes occurred in the Indian Ocean during the instrumentally observed period.