RED-ACT: Feb. 08, M4.1 Japan Shizuoka-ken Chubu Earthquake
RED-ACT Report
Real-time Earthquake Damage Assessment using City-scale Time-history analysis
Feb. 08, M4.1 Japan Shizuoka-ken Chubu Earthquake
Research group of Xinzheng Lu at Tsinghua University (luxz@tsinghua.edu.cn)
First reported at 07:40, Feb. 08, 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: 34, Feb. 08, 2019 (Local Time, UTC +9), an M 4.1 (JMA) earthquake occurred in Shizuoka-ken Chubu. The epicenter was located at 138.4E 35.2N, with a depth of 20.0 km.
2. Recorded ground motions
13 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 65 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/2019-02-28-Japan-4.1.html
http://www.luxinzheng.net/software/2019-02-28-Japan-4.1-Acc.html
Table 1 Names and locations of the strong motion stations
No.Station NameLongitudeLatitude
1SZO003139.05534.8158
2SZO006138.79434.9113
3SZO008138.86635.096
4SZO011138.60235.2128
5SZO012138.62135.1271
6SZO013138.47635.041
7SZO014138.37434.9649
8SZO015138.34135.2435
9SZO016138.31134.8566
10SZO026137.89834.9816
11YMN006138.60735.4684
12YMN007138.46535.2791
13YMN008138.33235.432
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