RED-ACT Report: Jan 26, M4.4 Japan Kumamoto-ken-chiho Earthquake
RED-ACT Report
Real-time Earthquake Damage Assessment using City-scale Time-history analysis
Jan. 26, Japan Kumamoto-ken Kumamoto-chiho Earthquake
Research group of Xinzheng Lu at Tsinghua University
luxz@tsinghua.edu.cn
First reported at 13:50, Jan. 26, 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 14: 16, Jan. 26, 2019 (Local Time, UTC +9), an M 4.4 (JMA) earthquake occurred in Kumamoto-ken Kumamoto-chiho, Japan. The epicenter was located at 33.0N, 130.6E, with a depth of 10.0 km. The maximal recorded peak ground acceleration (PGA) is 95cm/s/s.
2. Recorded ground motions
20 ground motions near to epicenter of this earthquake were analyzed.
No.Station NameLongitudeLatitude
1FKO011130.51233.3235
2FKO013130.56133.2252
3FKO014130.81833.1491
4FKO015130.40533.1627
5FKO016130.44733.0159
6KGS001130.17632.1947
7KMM001131.06933.1208
8KMM002130.68533.0185
9KMM003130.54832.9336
10KMM005130.87732.8761
11KMM008130.65832.6878
12KMM009130.98932.6864
13KMM011130.86532.6167
14KMM012130.60232.5078
15NGS012130.34632.7884
16NGS014130.18532.6106
17OIT005131.11433.4549
18SAG003130.20733.373
19SAG005130.06433.3213
20SAG007130.333.2627
3. Seismic damage analysis for 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. These damage ratios can provide a reference for post-earthquake rescue work. The damage ratio distribution of the buildings near to different stations is shown in Figure 1. The human comfortableness distribution near to different stations is shown in Figure 2.
The details can be accessed at
http://www.luxinzheng.net/software/2019-01-26-Japan-4.4.html
http://www.luxinzheng.net/software/2019-01-26-Japan-4.4-Acc.html
Figure 1 Damage ratio distribution of the buildings near to different stations
Figure 2 Human comfortableness distribution near to different stations
附：党纪教授发来的日方分析结果
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