Preliminary analysis of emergency production and source parameters of the M 4.7 earthquake on September 18, 2024 in Feidong, Anhui

Abstract

At 20:08 on September 18, 2024, Beijing time, an earthquake of magnitude 4.7 occurred in Feidong, Anhui Province (31.98°N, 117.6°E). The China Earthquake Early Warning Network presented the first early warning results 8.9 s after the earthquake. The China Earthquake Networks Center (CENC) released the automatic rapid report results 163 s after the earthquake and the official rapid report results 8 min after the earthquake. At the same time, the CENC reported a series of emergency products, including source parameters, seismic tectonics, historical earthquakes, focal mechanism, instrument seismic intensity and predicted intensity. The results showed that the earthquake was located at the junction of the southern section of the Tanlu Fault and the Feizhong Fault, with aftershocks distributed in the NEE direction. The focal mechanism solution indicates that the earthquake is essentially a strike-slip event. The predicted intensity in the vicinity of the epicenter reaches up to VI, involving 23 towns that cover an area of about 1 359 km². Only one station near the epicenter shows a peak acceleration value greater than the fortification standard of the area, which may cause slight damage to some adjacent houses, consistent with the actual damage to buildings.

Keywords

Anhui Feidong earthquake / Earthquake rapid report / Data products / Focal mechanism / Seismic intensity

CRediT authorship contribution statement

Jiajing Xu: Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Validation, Writing - original draft, Writing - review & editing. Guangjie Han: Data curation, Formal analysis, Funding acquisition, Writing - review & editing. Nan Xi: Resources, Software, Visualization, Writing review & editing. Li Sun: Validation, Methodology, Writing - review & editing.

Declaration of competing interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Author agreement and acknowledgment

I would like to declare on behalf of my co-authors that the work described was original research that has not been published previously and is not under consideration for publication elsewhere, in whole or in part. We are grateful to the Emergency Product Output Service Working Group of the Early Warning and Rapid Reporting Department of CENC, and along with the Institute of Geophysics, China Earthquake Adminis-tration, have provided a plethora of data products, emergency maps and information for this article. We would like to express our deep gratitude to the managing editor for his gracious support. We thank the editor, Ms. Qin Xu, and two anonymous reviewers for construcive comments. This work was supported by National Natural Science Foundation of China (52122811).

Data and resources

Seismic waveform data were requested with a preauthorized account from the Data Management Center of China Earthquake Networks Center (https://data.earthquake.cn). GMT software was used to draw all maps related to geological structures and faults in this paper (Wessel et al., 2013).

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