5:15 PM - 6:45 PM
[HDS11-P12] Improvement of the Japan Tsunami Hazard Information Station (J-THIS): Enhancement of tsunami hazard information for great earthquakes along the Nankai Trough
Keywords:Japan Tsunami Hazard Information Station (J-THIS), tsunami, probabilistic tsunami hazard assessment (PTHA), Nankai Trough
1. Introduction
We have been conducting nationwide Probabilistic Tsunami Hazard Assessments (PTHAs) in Japan. As a part of this research, we developed and have been improving the Japan Tsunami Hazard Information Station (J-THIS) (https://www.j-this.bosai.go.jp/) as a public system for sharing various tsunami hazard information, which started operating in February 2020 (Dohi et al., 2022). J-THIS has been providing information on PTHAs along the Nankai Trough, which focused on interplate earthquakes (Mw7.6–9.0), excluding possible maximum-sized ruptures, for the Earthquake Research Committee (ERC), Headquarters for Earthquake Research Promotion of the Japanese government (2020). J-THIS Labs has been providing information on our original PTHAs along the Nankai Trough since December 2023, incorporating various types of earthquakes, including possible maximum-sized ruptures, as detailed below.
2. PTHAs
Based on the long-term evaluation of seismic activities at the Nankai Trough (HERP, 2013), we conducted PTHAs along the Nankai Trough, which focused on interplate earthquakes (Mw7.6–9.1) including possible maximum-sized ruptures (Fujiwara et al., 2020) (Part 1). In addition to Part 1, we conducted PTHAs for the ERC (2020), which excluded possible maximum-sized ruptures (Fujiwara et al., 2020) (Part 2).
3. J-THIS Labs
J-THIS Labs is an open web resource providing information on our original PTHAs through three services: map services, data download services, and Web application programming interface (API) services. As of 15 February 2024, J-THIS Labs provides the following tsunami hazard information via Parts 1 and 2:
Part 1:
– distributions of 30-year exceedance probability of tsunami heights greater than 3 m, 5 m, and 10 m
– distributions of tsunami heights at 3%, 6%, and 26% of 30-year exceedance probability
– tsunami hazard curves on coastlines
– earthquake fault parameters and slip distributions of 3,480 earthquake fault models (EFMs) used in PTHAs
– distributions of tsunami heights for each EFM
– bathymetric charts used in PTHAs
Part 2:
– distributions of 30-year exceedance probability of tsunami heights greater than 3 m, 5 m, and 10 m
– tsunami hazard curves on coastlines
– histograms of tsunami heights for each EFM along coastlines
– earthquake fault parameters and slip distributions of 2,720 EFMs used in PTHAs
– distributions of tsunami heights for each EFM
– bathymetric charts used in PTHAs
J-THIS Labs enables users to select multiple reference dates of PTHAs (Part 1: 1 January 2020, 1 January 2021, 1 January 2022, 1 January 2023; Part 2: 1 January 2021, 1 January 2022, 1 January 2023) as of 15 February 2024.
We developed and have been improving J-THIS as a part of the Research and Development on Hazard and Risk of Natural Disasters research project of the National Research Institute for Earth Science and Disaster Resilience (NIED).
We have been conducting nationwide Probabilistic Tsunami Hazard Assessments (PTHAs) in Japan. As a part of this research, we developed and have been improving the Japan Tsunami Hazard Information Station (J-THIS) (https://www.j-this.bosai.go.jp/) as a public system for sharing various tsunami hazard information, which started operating in February 2020 (Dohi et al., 2022). J-THIS has been providing information on PTHAs along the Nankai Trough, which focused on interplate earthquakes (Mw7.6–9.0), excluding possible maximum-sized ruptures, for the Earthquake Research Committee (ERC), Headquarters for Earthquake Research Promotion of the Japanese government (2020). J-THIS Labs has been providing information on our original PTHAs along the Nankai Trough since December 2023, incorporating various types of earthquakes, including possible maximum-sized ruptures, as detailed below.
2. PTHAs
Based on the long-term evaluation of seismic activities at the Nankai Trough (HERP, 2013), we conducted PTHAs along the Nankai Trough, which focused on interplate earthquakes (Mw7.6–9.1) including possible maximum-sized ruptures (Fujiwara et al., 2020) (Part 1). In addition to Part 1, we conducted PTHAs for the ERC (2020), which excluded possible maximum-sized ruptures (Fujiwara et al., 2020) (Part 2).
3. J-THIS Labs
J-THIS Labs is an open web resource providing information on our original PTHAs through three services: map services, data download services, and Web application programming interface (API) services. As of 15 February 2024, J-THIS Labs provides the following tsunami hazard information via Parts 1 and 2:
Part 1:
– distributions of 30-year exceedance probability of tsunami heights greater than 3 m, 5 m, and 10 m
– distributions of tsunami heights at 3%, 6%, and 26% of 30-year exceedance probability
– tsunami hazard curves on coastlines
– earthquake fault parameters and slip distributions of 3,480 earthquake fault models (EFMs) used in PTHAs
– distributions of tsunami heights for each EFM
– bathymetric charts used in PTHAs
Part 2:
– distributions of 30-year exceedance probability of tsunami heights greater than 3 m, 5 m, and 10 m
– tsunami hazard curves on coastlines
– histograms of tsunami heights for each EFM along coastlines
– earthquake fault parameters and slip distributions of 2,720 EFMs used in PTHAs
– distributions of tsunami heights for each EFM
– bathymetric charts used in PTHAs
J-THIS Labs enables users to select multiple reference dates of PTHAs (Part 1: 1 January 2020, 1 January 2021, 1 January 2022, 1 January 2023; Part 2: 1 January 2021, 1 January 2022, 1 January 2023) as of 15 February 2024.
We developed and have been improving J-THIS as a part of the Research and Development on Hazard and Risk of Natural Disasters research project of the National Research Institute for Earth Science and Disaster Resilience (NIED).