RED-ACT: 12月19日日本本州5.5级地震破坏力分析
RED-ACT Report
Real-time Earthquake Damage Assessment using City-scale Time-history analysis
Dec. 19, M5.5 Aomori-ken, Japan Earthquake
Research group of Xinzheng Lu at Tsinghua University (luxz@tsinghua.edu.cn)
First reported at 14:40, Dec. 19, 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/rr.htm
1. Introduction to the earthquake event
At 15:21 19 Dec 2019 (Local Time, UTC +9), an M 5.5 (JMA) earthquake occurred in Japan Aomori-ken. The epicenter was located at 142.2 40.5, with a depth of 50.0 km.
2. Recorded ground motions
16 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 251 cm/s/s. The waveform and 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 Waveform and 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, the damage ratios of buildings located in different places can be obtained. The building damage distribution and the human feeling distribution near to different stations are 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 feeling 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/rr.htm
Table 1 Names and locations of the strong motion stations
No.Station NameLatitudeLongitude
1AKT001140.74340.3279
2AOM006140.99741.1976
3AOM007141.38541.169
4AOM008141.25541.084
5AOM010141.14240.8721
6AOM011141.36740.6803
7AOM012141.48140.5138
8AOM013141.2840.4124
9AOM014140.94140.4371
10AOM021141.20840.6152
11IWT001141.71940.4099
12IWT004141.96739.7357
13IWT020141.32939.7841
14IWT021141.08239.9203
15IWT022141.05240.1011
16IWT024141.29140.2612
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