收集整理乌加河地震台PET重力仪和JCZ-1地震计记录的2021年12月9日蒙古MS 5.1、2022年3月16日日本本州东岸近海MS 7.4和2022年4月21日尼加拉瓜沿岸近海MS 8.2地震的数据，基于同震响应原始波形及频谱分析，对比分析2套仪器对近震、远震、极远震的记录特征。结果发现：①原始波形：2套仪器记录的3次地震原始波形均清晰可辨，且一致性较好，表现在P波（PKP波）初动方向一致、地震波持续时间一致；②频谱分析：基于秒采样数据，利用2套记录功率谱均无法检测蒙古MS 5.1地震（近震），日本MS 7.4地震（远震）、尼加拉瓜MS 8.2地震（极远震）波谱则比较显著。时频分布结果显示，对于蒙古MS 5.1地震（近震），测震记录含有更多能量信息；对于作为远震和极远震的日本MS 7.4地震、尼加拉瓜MS 8.2地震，2套仪器记录的时频分布结果无明显差异，一致性较好。
In this paper, the seismic data of the Mongolia MS 5.1 earthquake on December 9, 2021, near the east coast of Honshu MS 7.4 earthquake, in Japan on March 16, 2022, and near the coast of Nicaragua MS 8.2 earthquake on April 21, 2022, recorded by the PET gravimeter and JCZ-1 seismometer at Wujiahe Seismic Station, were collected. Based on the original waveforms and spectrum analysis of coseismic response, comparative analysis was conducted on the recording characteristics of two sets of instruments for near earthquakes, teleseism, and extremely distant earthquakes. The results show that:①Original waveform:the original waveforms of the three earthquakes recorded by the two sets of instruments are clear and consistent, displaying consistency in the initial motion direction of P wave (PKP wave) and in the duration of seismic wave; ②Spectrum analysis:Based on second sampling data, neither of the power spectra recorded by the two sets of instruments could detect the Mongolia MS 5.1 earthquake (near earthquake), while the spectra of the Japan MS 7.4 earthquake (teleseism) and Nicaragua MS 8.2 earthquake (extremely distant earthquake) were relatively significant. The time-frequency distribution results show that for the Mongolia MS 5.1 earthquake (near earthquake), the seismic records contain more energy information. However, for the Japan MS 7.4 earthquake (teleseism) and Nicaragua MS 8.2 earthquake (extremely distant earthquake), there is no significant difference in the time-frequency distribution recorded by the two sets of instruments, indicating good consistency.
2023,44（3）: 133-138 收稿日期：2022-11-01
DOI：10.3969/j.issn.1003-3246.2023.03.019
基金项目：内蒙古自治区地震局局长基金课题（项目编号：2022JC10）
作者简介：石伟(1993-),男,内蒙古巴彦淖尔人,学士,工程师,现主要从事地震活动性研究和地震分析预报工作。E-mail:1335176609@qq.com
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