The Nankai Trough Earthquake, which is estimated to have a 70%–80% probability of occurring within the next 30 years, necessitates considering various scenarios due to the extensive seismic source region and call for advancing disaster preparedness measures. Assessing direct damage caused by earthquakes is considered particularly challenging compared to assessing human and physical damage due to its intricate composition. However, the existing research in model analysis aimed at real-time estimation has yielded results, namely, the ability to promptly calculate direct damage from earthquakes using seismic motion and stock quantities as inputs. This study aimed to leverage the research outcomes of real-time estimation to approximate the direct damage costs that would be caused by the Nankai Trough Earthquake. Three hazard assessment cases were selected, based on damage estimations to be attempted. The results indicated that a damage estimation approach based on a common foundation dataset and model analysis considering different occurrence scenarios is more suitable for evaluating results and assessing the importance of mitigation measures than conventional scenario-based damage estimations.

1. [1] UNDRR, “Sendai Framework for Disaster Risk Reduction 2015-2030,” 2015. https://www.undrr.org/publication/sendai-framework-disaster-risk-reduction-2015-2030 [Accessed May 16, 2023]
2. [2] I. Nakabayashi, “‘The Scale of Damage’ as the Impact on a Region by Disaster,” Comprehensive Urban Studies, No.5, pp. 71-89, 1978 (in Japanese).
3. [3] T. Uenoyama and N. Arai, “What are the Economic Losses Caused by Catastrophic Disaster?–Examples of the Great Hanshin-Awaji Earthquake, the 9/11 Terrorist Attacks, and Hurricane Katrina–,” ESRI Discussion Paper, No.177, pp. 1-24, 2007 (in Japanese).
4. [4] Economic Research Bureau, Cabinet Office, “Estimation Method of Stock Damage Amount Caused by the Great East Japan Earthquake,” Economic Research Discussion Paper, 2011 (in Japanese). http://www5.cao.go.jp/keizai3/discussion-paper/dp111.pdf [Accessed May 16, 2023]
5. [5] Working Group of Countermeasures Against Nankai Trough Earthquake, Central Disaster Management Council, Committee for Policy Planning on Disaster Management, Cabinet Office, “Damage Estimation of Nankai Trough Earthquake (Economic damage),” 2019 (in Japanese). https://www.bousai.go.jp/jishin/nankai/taisaku_wg/pdf/3_sanko.pdf [Accessed May 16, 2023]
6. [6] The Earthquake Research Committee, “Probabilistic Hazard Assessment of Tsunami due to Large Earthquakes Along the Nankai Trough,” Headquarters for Earthquake Research Promotion, 2020. https://www.jishin.go.jp/main/chousa/20jan_tsunami/nankai_tsunami.pdf [Accessed May 16, 2023].
7. [7] H. Fujiwara et al., “Probabilistic Tsunami Hazard Assessment for Earthquakes Occurring along the Nankai Trough – Vol.1, Part I,” Technical Note of the National Research Institute for Earth Science and Disaster Resilience, No.439, 2020 (in Japanese).
8. [8] Working Group of Countermeasures Against Nankai Trough Earthquake, Central Disaster Management Council, Committee for Policy Planning on Disaster Management, Cabinet Office, “Damage Estimation of Nankai Trough Earthquake (First report),” 2012. https://www.bousai.go.jp/jishin/nankai/taisaku_wg/pdf/20120829_higai.pdf [Accessed May 16, 2023]
9. [9] Working Group of Countermeasures Against Nankai Trough Earthquake, Central Disaster Management Council, Committee for Policy Planning on Disaster Management, Cabinet Office, “Damage Estimation of Nankai Trough Earthquake (Second report),” 2013. https://www.bousai.go.jp/jishin/nankai/taisaku_wg/pdf/20130318_shiryo3.pdf [Accessed May 16, 2023]
10. [10] H. Taniguchi and H. Kanegae, “Regional Economic Impact of Earthquake Events,” Proc. of the Japan Conf. on Structural Safety and Reliability (JCOSSAR2000), 2000.
11. [11] J. Park, Q. Cui, and H. Taniguchi, “Method for Analysis of Economic Reconstruction Planning for Disaster-affected Areas Based on Past Earthquake and Tsunami Experiences,” Studies in Regional Science, Vol.43, No.3, pp. 291-305, 2013 (in Japanese with English abstract). https://doi.org/10.2457/srs.43.291
12. [12] Q. Cui, M. Cui, T. Toyoda, and H. Taniguchi, “Simple Estimation Method for the 2016 Kumamoto Earthquake’s Direct Damage Amount,” J. Disaster Res., Vol.12, No.sp, pp. 656-668, 2017. https://doi.org/10.20965/jdr.2017.p0656
13. [13] Q. Cui et al., “Real Time Situation Grasping Technology on Direct Damage Amount of Earthquake: Case Study on the 2016 Kumamoto Earthquake,” J. of Social Safety Science, Vol.33, pp. 147-156, 2018 (in Japanese). https://doi.org/10.11314/jisss.33.147
14. [14] Minryoku DVD-Rom, “Marketing Database (1989-2015),” Asahi Shimbun Publications Inc., 2015.
15. [15] United States Geological Survey (USGS), “Earthquake Hazard Program.” https://earthquake.usgs.gov/data/pager/ [Accessed May 16, 2023]
16. [16] X. Zhang et al., “An empirical method to estimate earthquake direct economic losses using building damages in high intensity area as a proxy,” Natural Hazards Research, Vol.1, No.2, pp. 63-70, 2021. https://doi.org/10.1016/j.nhres.2021.03.002
17. [17] Federal Emergency Management Agency (FEMA), “Hazus.” https://www.fema.gov/flood-maps/products-tools/hazus [Accessed May 16, 2023]
18. [18] T. Toyoda et al., “Rapid Estimation of Direct Economic Losses Caused by Significant Earthquakes: An Evidence-Based Model and Its Applications,” J. Disaster Res., Vol.18, No.2, pp. 178-189, 2023. https://doi.org/10.20965/jdr.2023.p0178
19. [19] M. Ikeda, Q. Cui, T. Toyoda, H. Nakamura, and H. Fujiwara, “Developing an Automated System for Simple Estimation of the Direct Damage Amounts from Earthquakes,” J. Disaster Res., Vol.16, No.2, pp. 275-286, 2021. https://doi.org/10.20965/jdr.2021.p0275
20. [20] T. Toyoda et al., “A Study on Real-Time Estimation of Direct Economic Losses Caused by Major Earthquakes,” J. of Social Safety Science, Vol.36, pp. 33-42, 2020 (in Japanese). https://doi.org/10.11314/jisss.36.33
21. [21] H. Si and S. Midorikawa, “New Attenuation Relationships for Peak Ground Acceleration and Velocity Considering Effects of Fault Type and Site Condition,” J. of Structural and Construction Engineering, Vol.64, Issue 523, pp. 63-70, 1999 (in Japanese with English abstract). https://doi.org/10.3130/aijs.64.63_2
22. [22] H. Fujiwara and T. Toyoda (Eds.), “An Approach to Real-Time Estimation of Direct Economic Losses Caused by Major Earthquakes in Japan,” Technical Note of the National Research Institute for Earth Science and Disaster Resilience, No.460, 2021 (in Japanese).
23. [23] Geospatial Information Authority of Japan, “Geospatial information web site.” https://www.gsi.go.jp/kiban/ [Accessed May 16, 2023]