摘要
华北重力复测网(火车运输)始建于1972～1973年,三环共45个点,1986年起改用高精度LCR G重力仪观测(仍保持三环,点位减到15个),至今已积累了16～33期重复观测资料。根据资料,华北网各测点重力值变化可分为三类,即1.有异常变化点;2.持续相对稳定点;3.重力值有变化,但非深部物质引起或重力值无变化点。如果观测到的异常持续3～5年,且与背景相符,即有可能与中强震有关,并已被实践证明,因此,重力大跨度复测是中长期地震预报的一种有效手段。
The repeated surveying network of gravity in Norty China(transported by train),which has 45 points in three loops,was established in 1972 to 1973.Since the application of precision LCR-G gravimeter in 1986(the surveying points rdduced from 45 to 15 in the three loops),it has accumulated 17observations data.The variation of gravity on each point in North China network can be divided into three types:(1)abnormal points,(2)relative stable points(3)there are some change in gravity,but not caused by deep materials.If the anomalies of gravity lasted 3 to 5years,it may have relations with a mid-stronger earthquake.Prediction practice shows that repeated survey of gravity is an effective approach in earthquake prediction.
出处
《华北地震科学》
2003年第1期46-51,共6页
North China Earthquake Sciences
关键词
重力变化
形变
水位影响
华北
gravity variation:deformation
reltive stable points of gravity
Bouguer anomaly
