台风黑格比和巴威对地脉动的影响  

The influence of Typhoon Hagupit and Typhoon Bavi on microseisms

作　　者：孙冬军 刘芳[1,2] 王鹏 于海英[1,2] 王成睿 Sun Dongjun;Liu Fang;Wang Peng;Yu Haiying;Wang Chengrui(Shanghai Earthquake Agency,Shanghai 200062,China;Shanghai Sheshan National Geophysical Observatory,Shanghai 200062,China)

机构地区：[1]上海市地震局,上海200062 [2]上海佘山地球物理国家野外科学观测研究站,上海200062

出　　处：《地震学报》2023年第3期445-454,共10页Acta Seismologica Sinica

基　　金：上海佘山地球物理国家野外科学观测研究站海洋地震观测研究室课题(2022SSY04);上海市地震局地震监测预警科技创新团队联合资助.

摘　　要：台风引起的海浪通常可加强地脉动能量,而地脉动的激发机制和噪声源位置存在一定争议。通过计算沿海和内陆的7个宽频带地震台站2020年7月1日—9月1日连续波形数据的功率谱密度并对连续波型数据进行极化分析,定量讨论台风期间不同频段的功率谱密度值变化,研究佘山台、大洋山台、横湖台、天平山台和秦皇山台的噪声源方向分布。结果表明:台风黑格比和巴威明显加强了双频地脉动功率谱密度值,尤其对于长周期双频地脉动的加强作用更为显著,对于单频地脉动及≥20 s周期地脉动的影响则相对不显著;佘山台、大洋山台、秦皇山台、天平山台和横湖台记录的短周期双频地脉动可能是邻近海域不同噪声源起主导作用;长周期双频地脉动的噪声源方向一致性较好,指向南南西方向,可能受到南海海域或者更南边的源区的影响,而单频地脉动则主要受到海岸线上不同噪声源的影响。Typhoon-induced waves can usually enhance the microseisms energy,the generation mechanism and source locations of microseisms are controversial.We calculated the power spectral density and carried out polarization analysis of the continuous waveform data of seven wide-band seismic stations on the coast or inland from July 1 to September 1,2020.The variation of power spectral density in different frequency bands during typhoons has been quantitatively discussed,and the distribution of noise sources at the seismic stations SSE,DYS,HUH,TPS and QHS were studied.The results show that the power spectral density of doublefrequency microseisms significantly increased after Typhoon Hagupit and Typhoon Bavi,especially the long period double-frequency microseisms.The single frequency microseisms and microseisms with period≥20 s increased inconspicuously.The short period double-frequency microseisms recorded at SSE,DYS,HUH,TPS,and QHS seismic stations are affected by different sources in the adjacent sea area.The sources of the long period double-frequency microseisms are consistent,pointing to the south-south-west direction,which may be affected by the source area of the South China Sea or further south.The single frequency microseisms are affected by different noise sources along the coastline.

关 键 词：台风 地脉动 浪高 功率谱密度 噪声源 

分 类 号：P315.31[天文地球—地震学]