RED-ACT: 6月18日，日本6.8级地震破坏力分析
RED-ACT Report
Real-time Earthquake Damage Assessment using City-scale Time-history analysis
June 18, M6.8 Japan Yamagata-ken Oki Earthquake
Research group of Xinzheng Lu at Tsinghua University (luxz@tsinghua.edu.cn)
First reported at 21:45, June 18, 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 22:22 JST 18 Jun 2019 (Local Time, UTC +9), an M 6.8 (JMA) earthquake occurred in Japan Yamagata-ken Oki. The epicenter was located at 139.5 38.6, with a depth of 10.0 km.
2. Recorded ground motions
25 ground motions near to epicenter of this earthquake were analyzed. The names and locations of the stations can be found in Table 1. The maximal recorded peak ground acceleration (PGA) is 331 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.
(a) YMT005
(b) YMT003
Figure 1 Response spectra of the recorded ground motions
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 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 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 near the station 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
1AKT011140.5839.8128
2AKT017140.56339.2975
3AKT018140.1939.1939
4AKT019140.45139.0384
5AKT020139.90939.2022
6FKS022139.64737.6002
7FKS023139.92937.4774
8MYG005140.65138.7992
9MYG019140.72338.7513
10NIG002138.4438.0745
11NIG003138.32337.9976
12NIG004138.2837.8205
13NIG006139.49638.4501
14NIG007139.48638.2301
15NIG008139.40538.053
16NIG011139.14437.8013
17NIG012139.47737.6863
18YMT001139.81338.914
19YMT003139.80138.7292
20YMT005140.16238.607
21YMT008139.99238.3856
22YMT012140.04338.1074
23YMT013139.75738.0621
24YMT014139.8737.9207
25YMT016140.01838.7895
程庆乐
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