Check of free oscillation signal with SG data  

作　　者：Xiang’e Lei Houze Xu Heping Sun 

机构地区：[1]Chinese Acad Sci, Inst Geodesy & Geophys, Key Lab Dynam Geodesy, Wuhan 430077, Peoples R China

出　　处：《Chinese Science Bulletin》2002年第18期1573-1578,共6页

基　　金：This work was supported jointly by the National Natural Science Foundation of China (Grant Nos. 40074018 and 49925411).

摘　　要：The observation of the Earth’s free oscillation is an important way to study the Earth’s inner structure and geophysical parameters. Many geophysicists have investigated the Earth’s normal modes with strainmeters and spring gravimeters. Since the superconducting gravimeters appeared, people have gained a new kind of more stable instruments to detect the normal modes. The measurement for the Earth’s free oscillation with the superconducting gravimeters is one of the main goals of the Global Geodynamics Project. In this note, we have investigated the Earth’s normal modes excited by Peru Ms 7.9 Earthquake on June 23, 2001 with the superconducting gravimeter C032 at the Wuhan station. After having completed the subtraction of gravity tides with the 20th order polynomial fitting, and the correction for pressure and the analysis of the noise spectrum of the superconducting gravimeter, we accurately observed all base normal modes from 0S0 to 0S32 and the splittings of 0S2 and 0S3. Those results show a goodThe observation of the Earth’s free oscillation is an important way to study the Earth’s inner structure and geophysical parameters. Many geophysicists have investigated the Earth’s normal modes with strainmeters and spring gravimeters. Since the superconducting gravimeters appeared, people have gained a new kind of more stable instruments to detect the normal modes. The measurement for the Earth’s free oscillation with the superconducting gravimeters is one of the main goals of the Global Geodynamics Project. In this note, we have investigated the Earth’s normal modes excited by Peru Ms 7.9 Earthquake on June 23, 2001 with the superconducting gravimeter C032 at the Wuhan station. After having completed the subtraction of gravity tides with the 20th order polynomial fitting, and the correction for pressure and the analysis of the noise spectrum of the superconducting gravimeter, we accurately observed all base normal modes from 0 S 0 to 0 S 32 and the splittings of 0 S 2 and 0 S 3. Those results show a good agreement with the HB1 model.

关 键 词：earth free oscillation SUPERCONDUCTING GRAVIMETER TIDAL POLYNOMIAL fitting pressure correction. 

分 类 号：P631[天文地球—地质矿产勘探]