RED-ACT: Feb. 21, M5.7 Japan Iburi-chiho Earthquake
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 NameLongitudeLatitude
1HKD103142.29742.7275
2HKD104142.13142.5886
3HKD105142.05442.4825
4HKD120141.66343.3443
5HKD124141.7942.9986
6HKD125142.13542.7608
7HKD126141.92842.575
8HKD127141.8242.8741
9HKD128141.82242.7655
10HKD129141.60642.6344
11HKD130141.3542.5627
12HKD131141.08142.4211
13HKD134141.07942.6711
14HKD139140.78243.1974
15HKD157140.9741.9051
16HKD180141.35143.139
17HKD181141.54643.1161
18HKD182141.55242.9925
19HKD184141.60142.79
20HKD185141.40242.7755
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