华北重力网测点重力变化特征与中强震的对应

详细信息 本馆镜像全文    |  推荐本文 | | 获取馆网全文

英文篇名：Characters of Gravity Change in North China surveying Network and its Correspondence with medium and strong Earthquake 中文刊名：华北地震科学 英文刊名：North China Earthquake Sciences 作者：李青 英文作者：LI Qing(Mobile Surveying Team ; HSB ; Baoding 071000 ; China) 中文关键词：重力变化 ; 形变 ; 水位影响 ; 华北 英文关键词：gravity variation ; deformation ; reltive stable points of gravity ; Bouguer anomaly 出版日期：2003-03-30 机构：河北省地震局流动测量队 河北保定　071000 年：2003 期：01 出版单位：华北地震科学

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.

引文

[1]　马丽,李家正.大同地区几次中强震前后的重力变化[J].西北地震学报1994(1):33 38.
    [2]　李家正.大同-阳高地震前后的重力变化[J].地震1992(3):48 52.
    [3]　李青.LCR-G重力仪长期动态漂移的初步研究[J].华北地震科学2000.18(4):26 52.