RED-ACT: Mar. 11, M5.9 Japan Fukushima-ken
RED-ACT Report
Real-time Earthquake Damage Assessment using City-scale Time-history analysis
Mar. 11, M5.9 Japan Fukushima-ken Earthquake
Research group of Xinzheng Lu at Tsinghua University (luxz@tsinghua.edu.cn)
First reported at 06:00, Mar. 11, 2019 (Beijing Time, UTC +8)
Acknowledgments and Disclaimer
The authors are grateful for the data provided by K-NET and KiK-net. This analysis is for research only. The actual damage resulting from the earthquake should be determined according to the site investigation.
Scientific background of this report can be found at:
http://www.luxinzheng.net/software/Real-Time_Report.pdf
1. Introduction to the earthquake event
At 02:11 11 Mar 2019 (Local Time, UTC +9), an M 5.9 (JMA) earthquake occurred in Japan Fukushima-ken. The epicenter was located at 142.5 36.8, with a depth of 10.0 km.
2. Recorded ground motions
9 ground motions near to epicenter of this earthquake were analyzed. The names and locations of the stations can be found Table 1. The maximal recorded peak ground acceleration (PGA) is 9.5 cm/s/s. The corresponding response spectra in comparison with the design spectra specified in the Chinese Code for Seismic Design of Buildings are shown in Figure 1.
Figure 1 Response spectra of the recorded ground motions with maximal PGA
3. Damage analysis of the target region subjected to the recorded ground motions
Using the real-time ground motions obtained from the strong motion networks and the city-scale nonlinear time-history analysis (see the Appendix of this report), the damage ratios of buildings located in different places can be obtained. The building damage distribution and the human uncomfortableness distribution near to different stations is shown in Figure 2 and Figure 3, respectively. These outcomes can provide a reference for post-earthquake rescue work.
Figure 2 Damage ratio distribution of the buildings near to different stations
Figure 3 Human uncomfortableness distribution near to different stations
The details can be accessed at
http://www.luxinzheng.net/software/2019-03-11-Japan-5.9.html
http://www.luxinzheng.net/software/2019-03-11-Japan-5.9-Acc.html
Scientific background of this report can be found at: http://www.luxinzheng.net/software/Real-Time_Report.pdf
Table 1 Names and locations of the strong motion stations
No. Station Name Longitude Latitude
1 FKS006 140.759 37.5031
2 FKS016 140.191 37.1228
3 FKS017 140.369 37.2842
4 FKS020 140.108 37.5474
5 FKS023 139.929 37.4774
6 FKS024 140.132 37.3957
7 MYG015 140.87 38.1049
8 MYG017 140.782 37.9763
9 TCG009 139.715 36.7258
------End------
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