京津唐地区的重力变化
GRAVITY CHANGE IN THE BEIJING-TIANJIN-TANGSHAN AREA
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摘要: 我们重力测量组在1981年7月用三台 LCR 重力仪建立了重力测网.测量精度优于100nm/s2.文章描述了京,津,唐地区重力随时间的变化.结果表明在天津地区增加了约1000nm/s2,天津是沉降中心,每年平均沉降约7——8cm.在其它台站,如堂二里,霸县等地重力值也逐年增加,但其幅度小于天津.重力变化的空间分布由东南向西北逐渐减小.Abstract: A gravity net-work was set up through a group of gravity measurements in July, 1981 with three LCR gravimeters. The errors of measarement are less than 100 nm/s2. The detected changes of gravity with time in the Beijing-Tianjin-Tangshan area are described in this article.The results show that the gravity has increased by about 1000 nm/s2 in the area round, where the ground has subsided at a rate of 7-8 cm/year with Tianjin as the center of subsidence and gravity increase.At other stations, such as Baodi, Tangerli etc. gravity has also increased gradully, but the amplitude is smaller than that at Tianjin. The tendency of gravity change is smaller in the north-west part than in the south-east part of the area.
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[1] Barnes, D., Gravity change in Alaska,J.Geophys. Res., 71, 451——457, 1966.
[2] 华昌才、肖钢,相对重力测量的双程工作法,地震地磁观测与研究,5,37——39,1984.
[3] 华昌才、郑金涵,苏鲁皖地区拉科斯特G型重力仪与绝对重力仪测定结果对比,地震地磁观测与研究,54——56, 1983.
[4] 华昌才、郑金涵,使用G型重力仪进行昆明、西安基线场测量工作中发现的问题,地震地磁观测与研究,4, 56——58,1983,
[5] 田岛稔一,松代地震の重力变化,测地学会誌,20,153——157,1979.[1] Barnes, D., Gravity change in Alaska,J.Geophys. Res., 71, 451——457, 1966.
[2] 华昌才、肖钢,相对重力测量的双程工作法,地震地磁观测与研究,5,37——39,1984.
[3] 华昌才、郑金涵,苏鲁皖地区拉科斯特G型重力仪与绝对重力仪测定结果对比,地震地磁观测与研究,54——56, 1983.
[4] 华昌才、郑金涵,使用G型重力仪进行昆明、西安基线场测量工作中发现的问题,地震地磁观测与研究,4, 56——58,1983,
[5] 田岛稔一,松代地震の重力变化,测地学会誌,20,153——157,1979.
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