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1981年1月24日北京时间五点十三分五十秒在我国四川省道孚地区(北纬31.°0,东径101.°2)发生了一次强烈地震.报上公布其震级为6.9级.它与一些台站如银川台测定为8.0,佘山、南京等台测定为7.6差别较大,凡来电报的台,基式记录均出格.国家地震局1月28日发出的《震情工作简报》第二期详细通报了全国33个台站测定的情况,但只给出13个台站的震级数据,没有列出其余20个台(其中包括14个基准台)所测的震级.因而我们感到有必要对这次地震震级做进一步的研究.为此,我们向全国34个地震台通过信件索取了有关资料.在这些台中,按装有中长周期地震仪(如SK基式,或DK—1)的共25个台.只有短周期仪器的台站参数不能参加震级平均计算,原因之一是由于众所周知的地震“饱和”的缘故,另有三个台正值仪器维修或故障(呼和浩特、长沙、邕宁台).总的情况是:SK仪记录
On January 24, 1981, at 5.33am Beijing time, a strong earthquake occurred in the Daofu area of Sichuan Province (latitude 31. ° 0, east end 101. ° 2), and its magnitude was 6.9 It is with a number of stations such as Yinchuan Taiwan measured 8.0, Sheshan, Nanjing and other stations measured 7.6 different, where telegraph Taiwan, basic records are outrageous. State Seismological Bureau January 28 issue of “Earthquake However, only the magnitude data of 13 stations are given. The magnitudes of the remaining 20 stations (including 14 reference stations) are not listed. Therefore, we felt it necessary to further study the magnitude of the earthquake, and for this reason, we have obtained the relevant information from 34 seismostation stations in our country by letter. In these stations, Or DK-1.) Only one station parameter for a short period instrument can not participate in the average magnitude calculation, one of the reasons being that due to the well-known ”saturation" of the earthquake, three more stations were in the stage of instrument maintenance or malfunctioning Hohhot, Changsha, Suining station.) The overall situation is: SK instrument records