RED-ACT: 美国加州6.4级地震破坏力分析
RED-ACT Report
Real-time Earthquake Damage Assessment using City-scale Time-history analysis
July 04, M6.4 California Petrolia Earthquake
Research group of Xinzheng Lu at Tsinghua University (luxz@tsinghua.edu.cn)
First reported at 7:00, July 05, 2019 (Beijing Time, UTC +8)
Acknowledgments and Disclaimer
The authors are grateful for the data provided by CESMD. 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 10:33:49 04 July 2019 (Local Time, UTC -8), an M 6.4 (USGS) earthquake occurred in California Searles Valley, USA. The epicenter was located at 35.7052N 117.506W, with a depth of 10.7 km.
2. Recorded ground motions
7 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 369 cm/s/s. The corresponding response spectra in comparison with the 8-degree 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
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 NameLongitudeLatitude
1CE24088-118.37634.296
2CE24457-118.14534.583
3CE24517-118.15834.687
4CE24661-118.1634.687
5CE24965-118.0334.57
6CE34349-118.47835.616
7CICCC-117.36535.525
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