Analysis of anomalous environmental responses to the 5.5 earthquake in Pingyuan County, Dezhou in august 2023 based on GNSS
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摘要: 为了探测2023年8月6日山东德州平原县5.5级地震引起的异常环境响应，本文基于震中东北方向约26 km的GNSS观测数据，提出滑动时变频率方法并引入四分位距(interquartile range，IQR)法对地震引发的异常环境响应进行分析. 结果显示，地震发生后N和E方向坐标速度时间序列在9~10 s处出现显著异常，垂向在16 s时出现轻微异常. 滑动时变频率方法能够在速度时间序列异常跳变发生前5~10 s探测到明显变化，显示了更高的灵敏度. 研究还发现，在地震发生前一天，电离层在震中上空出现了异常扰动，异常值达到4 TECU. 研究表明：GNSS技术能有效探测地震过程中的异常环境响应，为地震监测与预警提供了新的视角和工具.
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关键词:
- 全球导航卫星系统(GNSS) /
- 滑动时变频率 /
- 地震异常 /
- 四分位距(IQR)法
Abstract: To investigate the abnormal environmental response caused by the magnitude 5.5 earthquake in Pingyuan County, Shandong Province, on August 6th, 2023, this study based on the Global Navigation Satellite System (GNSS) observation data located about 26 km northeast of the epicenter, proposes a moving time-varying frequency method and incorporates the interquartile range (IQR) method to analyze the abnormal environmental responses triggered by the earthquake. The results indicate significant anomalies in the N and E directional coordinate velocity time series at 9 to 10 seconds after the earthquake, with a minor anomaly in the U direction at 16 seconds. Moreover, the sliding time-varying frequency method detects noticeable changes 5 to 10 seconds before the abnormal jump in the velocity time series, demonstrating higher sensitivity. The study also discovered abnormal disturbances in the ionosphere above the epicenter the day before the earthquake, with the anomaly reaching 4 TECU. This research demonstrates the effectiveness of GNSS technology in detecting abnormal environmental responses during earthquakes, offering a new perspective and tools for earthquake monitoring and early warning. -
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