一、方法及所用資料本文根据三十九个地震,利用基型面波羣速度的方法,确定了我国东半部、浅海区及西藏高原东部的地壳厚度。所用資料包括我国十个基本地震台上基式地震仪的記录,选用地震的震級均为5級以上,除个別地震外均为浅源地震。(見表1及图1)其中1961年9月以前地震的参数取自BCIS报告;对其他地震,系用我国和苏联临时报告給出的参 I. Methods and Data Used In this paper, based on 39 earthquakes and using the method of surface-type surface wave mass velocities, the crustal thickness in the eastern half of the country, the shallow sea and the eastern part of the Tibet Plateau are determined. The data used include records of ten basic seismographs in China’s ten basic seismic stations. The magnitudes of the selected earthquakes are all above Grade 5, except shallow earthquakes except for some earthquakes. (See Table 1 and Figure 1). The parameters of the earthquake before September 1961 are taken from the BCIS report. For other earthquakes, the parameters given in the interim report of China and the Soviet Union