LG WAVE ATTENUATION AND NEAR SHOCK MAGNITUDE IN THE EASTERN REGION OF CHINA

From the data of 80 local stations, in the eastern six provinces and vicinity 19 earthquakes of magnitudes 3-5 are selected to measure travel-time and amplitude of LGZ, LGH, MXZ and MXH wave phase.Basing on these 3000 data sets, wave propaga-tion velocity of 3.54K M/Sec has been obtained.The attenuation coefficients of Lg wave are calculated by synthetic regression method in the distance of 50-100KM.The results of a weighted and not of Z and H cmponents by weighted method and nonweighted are consistent very well with each other.