RED-ACT-Report: 04-28 M5.6 Japan Tokachi-chiho Earthquake
RED-ACT Report
Real-time Earthquake Damage Assessment using City-scale Time-history analysis
Apr. 28, M5.6 Japan Tokachi-chiho Nambu Earthquake
Research group of Xinzheng Lu at Tsinghua University (luxz@tsinghua.edu.cn)
First reported at 03:30, Apr. 28, 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.
Scientific background of this report can be found at:
http://www.luxinzheng.net/software/Real-Time_Report.pdf
1. Introduction to the earthquake event
At 02:25 28 Apr 2019 (Local Time, UTC +9), an M 5.6 (JMA) earthquake occurred in Japan Tokachi-chiho Nambu. The epicenter was located at 142.9 42.5, with a depth of 110.0 km.
2. Recorded ground motions
33 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 126 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
4. Earthquake-induced landslide of the target region subjected to the recorded ground motions
According to local topographic data, lithology data and ground motion records, the distribution of earthquake-induced landslide near to different stations under the different proportions of the landslide slab thickness that is saturated can be calculated, as shown in Figure 4. The basemap shows the distribution of the local slope. The number in the circle represents the critical slope of the landslide. The earthquake-induced landslide tends to occur with a higher probability when the slope is larger than this threshold value.
(a)The proportion of the landslide slab thickness that is saturated equals 0%
(b)The proportion of the landslide slab thickness that is saturated equals 50%
(c)The proportion of the landslide slab thickness that is saturated equals 90%
Figure 4 Distribution of earthquake-induced landslide near to different stations
Scientific background of this report can be found at: http://www.luxinzheng.net/software/Real-Time_Report.pdf
Table 1 Names and locations of the strong motion stations
No.Station NameLongitudeLatitude
1AOM01020190428022531141.14240.8721
2HKD07120190428022526145.2643.2326
3HKD07520190428022522145.02943.1309
4HKD07820190428022456144.49843.1486
5HKD08520190428022453144.0742.9581
6HKD08920190428022452143.55443.2436
7HKD09020190428022451143.61843.1213
8HKD09120190428022450143.65942.8087
9HKD09220190428022451143.44842.9283
10HKD09520190428022448143.21442.9311
11HKD09620190428022449143.13642.6975
12HKD09720190428022448143.42142.6181
13HKD09820190428022448143.27942.4984
14HKD09920190428022453142.83943.0736
15HKD10020190428022448143.31242.2864
16HKD10320190428022455142.29742.7275
17HKD10420190428022449142.13142.5886
18HKD10520190428022449142.05442.4825
19HKD10620190428022452142.36942.3414
20HKD10820190428022448142.56442.2528
21HKD10920190428022448142.76742.1678
22HKD11320190428022449143.31542.1287
23HKD12120190428022454141.85543.3332
24HKD12520190428022450142.13542.7608
25HKD12620190428022451141.92842.575
26HKD12720190428022451141.8242.8741
27HKD12820190428022451141.82242.7655
28HKD12920190428022508141.60642.6344
29HKD15820190428022457141.14141.8345
30HKD18120190428022454141.54643.1161
31HKD18220190428022454141.55242.9925
32HKD18420190428022452141.60142.79
33HKD18520190428022453141.40242.7755
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