海陆地震联测: 相邻地震台站的信号及震相特征对比

doi:10.11978/j.issn.1009-5470.2010.06.153

Abstract

Abstract:

Based on the 2004 data recorded by two permanent seismic stations in Zhuhai and Macao that are adjacent to each other, we studied the characteristics of the seismic wave produced by the air-gun in the onshore-offshore deep seismic ex-periment near Hong Kong. We carried out comparative study on the waveform, spectrum character, and the travel time of dif-ferent seismic phases. The results show that characteristics of the seismic waveform that came from different distances were similar at a single station but had some variation between the two stations. The noise had a stronger influence on the signal received by the Zhuhai station, which resulted in serious disturbance and more high-frequency components on the signal wave-form. The frequency response had a relatively sharp edge at the Zhuhai station but more moderate at the Macao station. We also obtained the laterally homogeneous 2-D models analyzed how different crust structures influence the time that the seismic wave travels. The PmP phase at the Zhuhai station traveled more slowly than that at the Macao station. We suggest that the fragmenta-tion of the granite basis and different thickness of the upper crust caused by the Shenzhen Fault may lead to the slower crustal seismic velocity, which is also considered to have caused the different waveform and frequency responses at the two stations.

Key words: onshore-offshore seismic experiment, deep crustal structure, seismic phase, power spectrum

HUANG Hai-bo,XIA Shao-hong,QIU Xue-lin,ZHAO Ming-hui,WEI Xiao-dong,. Onshore-offshore seismic experiment: signal characteristics and seismic phases re-ceived by two adjacent seismic stations[J].Journal of Tropical Oceanography, 2010, 29(6): 153-161.

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Onshore-offshore seismic experiment: signal characteristics and seismic phases re-ceived by two adjacent seismic stations

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