Abstract：By using highfrequency GPS doubledifference precision positioning technology, kinematic and static coseismic deformations caused by Japan Mw9.0 earthquake at nearfield and farfield GPS stations were obtained. The result shows that the maximum kinematic amplitude of IGS station is over 60 cm,postearthquake deformation reached to 30 cm. The kinematic deformation of farfield JLYJ GPS station clearly reflects the displacement waveform caused by seismic surface waves. The spectrum analysis shows that the period of seismic surface waves of JLYJ station caused by kinematic deformation is about 10-17 seconds. The kinematic displacements in eastwest direction and the vertical direction are much larger than that in the northsouth direction,it shows the deformation of JLYJ station is mainly caused by the Rayleigh wave and its harmonic wave. On the basis of the epicentral distance, the earthquake occurrence time, we can set the Rayleigh wave propagation speed of 3.5 km/s. As the Rayleigh wave changes in a period of 10-17 seconds, so its wavelength of is about 50 km.
Peng Maolei,Liu Gang,Nie Zhaosheng et al. PRELIMINARY STUDY ON CHARACTERISTICS OF HIGHFREQUENCYGPS DISPLACEMENT WAVE OF JAPAN Mw9.0 EARTHQUAKE[J]. jgg, 2011, 31(6): 6-10.
