Abstract
A moderate magnitude earthquake with Mw 5.8 occurred on June 17, 2019, in Changning County, Sichuan Province, China, causing 13 deaths, 226 injuries, and serious engineering damage. This earthquake induced heavier damage than earthquakes of similar magnitude. To explain this phenomenon in terms of ground motion characteristics, based on 58 sets of strong ground motions in this earthquake, the peak ground acceleration (PGA), peak ground velocity (PGV), acceleration response spectra (Sa), duration, and Arias intensity are analyzed. The results show that the PGA, PGV, and Sa are larger than the predicted values from some global ground motion models. The between-event residuals reveal that the source effects on the intermediate-period and long-period ground motions are stronger than those on short-period ground motions. Comparison of Arias intensity attenuation with the global models indicates that the energy of ground motions of the Changning earthquake is larger than those of earthquakes with the same magnitude.
Highlights
At 22:55:37 (Beijing time) on June 17, 2019 (14:56 UTC), an earthquake with Mw 5.8 occurred in Changning County in the southeast of Sichuan Province, China
The Mw 5.8 (Ms 6.0) Changning earthquake occurred at a focal depth of 16 km coming from China Earthquake Networks Center (CENC), while Yi et al (2019)’s seismic inversion results indicate that the focal depths of this series of earthquakes range from 0 to 10 km
To understand the heavy damage caused by the Changning earthquake in terms of the ground motion characteristics, we studied a dataset of strongmotion observations and presented an overview of these data from this event
Summary
At 22:55:37 (Beijing time) on June 17, 2019 (14:56 UTC), an earthquake with Mw 5.8 occurred in Changning County in the southeast of Sichuan Province, China. The most serious structural damage occurred in Changning County, especially in the village of Fuxing The nonstructural components, such as the filled walls and dropped ceilings of frame structures, were severely damaged during the earthquake, especially for a large number of rural masonry and timber buildings without seismic design. To understand the heavy damage caused by the Changning earthquake in terms of the ground motion characteristics, we studied a dataset of strongmotion observations and presented an overview of these data from this event. The characteristics of the strongmotion records are analyzed in terms of the amplitudes, Fig. 2 Representative damaged structures in the fault zone. From the perspective of ground motion characteristics, the cause of high amplitude of ground motion during the Changning earthquake from the source, path, and site effects was studied
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