RED-ACT: Feb. 21, M5.7 Japan Iburi-chiho

RED-ACT Report

Real-time Earthquake Damage Assessment using City-scale Time-history analysis

Feb. 21, M5.7 Japan Iburi-chiho Earthquake

Research group of Xinzheng Lu at Tsinghua University (luxz@tsinghua.edu.cn)

First reported at 20:46, Feb. 21, 2019 (Beijing Time, UTC +8)

Acknowledgments and Disclaimer

The authors are grateful for the data provided by 中国地震台网中心. This analysis is for research only. The actual damage resulting from the earthquake should be determined according to the site investigation.

1. Introduction to the earthquake event

At 21: 22, Feb. 21, 2019 (Local Time, UTC +9), an M 5.7 (JMA) earthquake occurred in Iburi-chiho Chutobu. The epicenter was located at  142.0 42.8, with a depth of 30.0 km. 

2. Recorded ground motions

20 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 368 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

igure 3 Human uncomfortableness distribution near to different stations

The details can be accessed at 

http://www.luxinzheng.net/software/2019-02-21-Japan-5.7.html 

http://www.luxinzheng.net/software/2019-02-21-Japan-5.7-Acc.html 

Table 1 Names and locations of the strong motion stations

No. Station Name Longitude Latitude

1 HKD103 142.297 42.7275

2 HKD104 142.131 42.5886

3 HKD105 142.054 42.4825

4 HKD120 141.663 43.3443

5 HKD124 141.79 42.9986

6 HKD125 142.135 42.7608

7 HKD126 141.928 42.575

8 HKD127 141.82 42.8741

9 HKD128 141.822 42.7655

10 HKD129 141.606 42.6344

11 HKD130 141.35 42.5627

12 HKD131 141.081 42.4211

13 HKD134 141.079 42.6711

14 HKD139 140.782 43.1974

15 HKD157 140.97 41.9051

16 HKD180 141.351 43.139

17 HKD181 141.546 43.1161

18 HKD182 141.552 42.9925

19 HKD184 141.601 42.79

20 HKD185 141.402 42.7755

------End------

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