Determination of rupture directivity of the 2024 Feidong M4.7 earthquake using one single near-source station

IF 4.1 4区地球科学 Q3 Earth and Planetary Sciences

Earthquake Science Pub Date : 2025-09-02 DOI:10.1016/j.eqs.2025.02.001

Suli Yao , Zhigao Yang , Hongfeng Yang

引用次数: 0

Abstract

Determining the rupture directivity for small earthquakes is challenging due to the small source dimension and limited resolution of far-field observations. In recent years, the burst of near-source observations provides great opportunities to study earthquake rupture. Here we present the rapid determination of the rupture directivity for the 2024 Feidong M4.7 earthquake using only one strong motion station located 4 km from the epicenter. We find that the polarization of S waves evolves during the rupture, indicating an azimuth change during the rupture propagation. Through comparing the data with the synthetic waveforms, we infer that the M4.7 event propagated dominantly to the southwest on the dextral Tanlu fault. Our inference is further validated through comparing the data with records at local stations for M3 earthquakes in the Feidong sequence. Our study highlights the superior application of near-source observations in earthquake source studies.

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利用单一近源台站测定2024年肥东4.7级地震的破裂方向性

由于震源尺寸小，远场观测分辨率有限，确定小地震的破裂指向性具有挑战性。近年来，近源观测的爆发为研究地震破裂提供了很好的机会。本文介绍了利用距离震中4公里的一个强震台站快速确定2024年肥东4.7级地震的破裂指向性。我们发现，在破裂过程中，S波的极化发生了变化，表明破裂传播过程中的方位角发生了变化。通过与合成波形的对比，推断此次4.7级地震主要在郯庐断裂右旋向西南方向传播。通过与肥东序列M3地震台站记录的对比，进一步验证了我们的推断。我们的研究突出了近源观测在震源研究中的优越应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Earthquake Science GEOCHEMISTRY & GEOPHYSICS-

CiteScore

1.10

自引率

8.30%

发文量

审稿时长

3 months

期刊介绍： Earthquake Science (EQS) aims to publish high-quality, original, peer-reviewed articles on earthquake-related research subjects. It is an English international journal sponsored by the Seismological Society of China and the Institute of Geophysics, China Earthquake Administration. The topics include, but not limited to, the following ● Seismic sources of all kinds. ● Earth structure at all scales. ● Seismotectonics. ● New methods and theoretical seismology. ● Strong ground motion. ● Seismic phenomena of all kinds. ● Seismic hazards, earthquake forecasting and prediction. ● Seismic instrumentation. ● Significant recent or past seismic events. ● Documentation of recent seismic events or important observations. ● Descriptions of field deployments, new methods, and available software tools. The types of manuscripts include the following. There is no length requirement, except for the Short Notes. 【Articles】 Original contributions that have not been published elsewhere. 【Short Notes】 Short papers of recent events or topics that warrant rapid peer reviews and publications. Limited to 4 publication pages. 【Rapid Communications】 Significant contributions that warrant rapid peer reviews and publications. 【Review Articles】Review articles are by invitation only. Please contact the editorial office and editors for possible proposals. 【Toolboxes】 Descriptions of novel numerical methods and associated computer codes. 【Data Products】 Documentation of datasets of various kinds that are interested to the community and available for open access (field data, processed data, synthetic data, or models). 【Opinions】Views on important topics and future directions in earthquake science. 【Comments and Replies】Commentaries on a recently published EQS paper is welcome. The authors of the paper commented will be invited to reply. Both the Comment and the Reply are subject to peer review.