RED-ACT: Mar. 02, M4.5 Japan Ibaraki-ken
RED-ACT Report
Real-time Earthquake Damage Assessment using City-scale Time-history analysis
Mar. 02, M4.5 Japan Ibaraki-ken Earthquake
Research group of Xinzheng Lu at Tsinghua University (luxz@tsinghua.edu.cn)
First reported at 7:00, Mar. 21, 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.
1. Introduction to the earthquake event
At 06: 03, Mar. 02, 2019 (Local Time, UTC +9), an M 4.5 (JMA) earthquake occurred in Japan Ibaraki-ken Oki. The epicenter was located at 141.1 36.5, with a depth of 40.0 km.
2. Recorded ground motions
10 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 64 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/2019-03-02-Japan-4.5.html
http://www.luxinzheng.net/software/2019-03-02-Japan-4.5-Acc.html
Table 1 Names and locations of the strong motion stations
No. Station Name Longitude Latitude
1 IBR001 140.357 36.7761
2 IBR002 140.707 36.7061
3 IBR003 140.645 36.5915
4 IBR004 140.41 36.5516
5 IBR005 140.237 36.3851
6 IBR007 140.595 36.3523
7 IBR013 140.489 36.1587
8 TCG009 139.715 36.7258
9 TCG013 140.023 36.4368
10 TCG014 140.174 36.545
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