选取2019年蓟县地震台VP型宽频带倾斜仪和DSQ型水管倾斜仪记录的10个地震事件,基于前兆台网观测数据跟踪分析平台,对比分析2套观测系统的同震响应参数。在分析过程中,以2019年12月15日菲律宾棉兰老岛MS 6.8地震为例,进行震相识别和快速傅里叶变换分析,并以2017—2019年日本岛弧地区地震记录为例,对比分析同震形变波振幅与震级的关系。分析结果表明:①2套观测系统记录的最大响应幅度、响应延迟时间、响应持续时间具有一定规律和差异性;②在频率响应上,VP型宽频带倾斜仪记录波谱信息丰富,可识别P波、S波、面波,而DSQ型水管倾斜仪记录波形频率集中分布在2—32 min;③对于日本岛弧地区5—7级地震,VP型宽频带倾斜仪记录的波形振幅A与震级M的指数关系明显,而DSQ型水管倾斜仪对5级地震映震能力不强。
Based on the precursory network observation data tracking and analysis platform,10 seismic events recorded by VP broadband tiltmeter and DSQ water-tube tiltmeter at Jixian Seismic Station in 2019 were selected to compare the coseismic response parameters of the two observation systems. In the analysis process, the MS 6.8 earthquake in Mindanao, Philippines, on December 15, 2019 was taken as an example to carry out seismic phase identification and Fast Fourier Transform analysis, and the earthquakes in the Japanese Island Arc from 2017 to 2019 were used to compare the relationship between coseismic deformation wave amplitude and magnitude. The results indicate that:① The maximum response amplitude, response delay time, and response duration recorded by the two observation systems have certain patterns and differences;② In terms of frequency response, VP broadband tiltmeter records rich spectral information and can identify P-waves, S-waves, and surface waves, while DSQ water-tube tiltmeter records waveform frequencies that are concentrated between 2-32 minutes; ③For earthquakes with magnitudes 5-7 in the Japanese Island Arc, VP broadband tiltmeter records an obvious exponential relationship between the waveform amplitude A and the magnitude M, while DSQ water-tube tiltmeter has weak seismic reflection ability for earthquakes with magnitudes 5.
2023,44(3): 147-153 收稿日期:2022-04-29
DOI:10.3969/j.issn.1003-3246.2023.03.021
基金项目:中国地震局监测、预测、科研三结合课题(项目编号:3JH-202001005,202001006);地震科技星火计划(项目编号:XH20002)
作者简介:朱冰清,工程师,主要从事地形变观测、地震学研究工作。E-mail:77684423@qq.com
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