蒙古中部剖面重力异常研究  

Study on Gravity Anomaly of Central Mongolia Profile

作　　者：黎哲君[1] 徐如刚[1] 陈石[2] 杨光亮[3] 闫万生 袁洁浩[2] 张毅[1] 顾左文[2] 

机构地区：[1]安徽省地震局,合肥市长江西路558号230031 [2]中国地震局地球物理研究所,北京市民族大学南路5号100081 [3]中国地震局地震研究所,武汉市洪山侧路40号430071 [4]甘肃省地震局,兰州市东岗西路450号730000

出　　处：《大地测量与地球动力学》2015年第5期866-870,共5页Journal of Geodesy and Geodynamics

基　　金：中国地震局地震行业科研专项经费(201308004);中蒙国际合作项目(2011DFB20210)

摘　　要：在蒙古中部106°E附近布设一条南北走向的重力剖面,首次获得该地区精确的实测重力值,经过数据预处理和改正计算,得到剖面重力异常结果。分析表明,剖面自由空气异常和地形有很强的相关性;剖面布格重力异常变化总体较为平缓,只在戈壁-阿尔泰-曼达尔戈壁加里东区带(GAB)和哈拉加里东区带(HRB)附近发生相对较快的变化,推测这两个区域可能存在较明显的深部构造变化;在蒙古-鄂霍兹克造山带附近,并未发现与板块缝合带相对应的重力异常变化;剖面均衡重力异常以负值为主,多数地区地壳未达到重力均衡状态,剖面附近地震活动和均衡重力异常之间的关系与中国南北地震带北段相关研究结果类似。A N-S trending profile has been set along the 106°E longitude and high-precision gravity data of this area was obtained for the first time.After a series of pretreatments and corrections,gravity anomalies of the profile are obtained.Analyses indicate that free-air anomaly of this profile is closely related to terrain.Bouguer gravity anomaly changes gently along the profile and relatively fast changes only occur in areas near the Gobi-Altai belt（GAB）and Haraa belt（HRB）.The rapid gravity anomaly change may indicate a rapid change of deep structure,and such gravity anomaly change is not found around the Mongol-Okhotsk orogenic belt.The isostatic gravity anomaly of the profile is mainly negative,equilibrium has not been reached for most areas.The correlation between earthquake activity and isostatic anomaly of the profile is similar to research results of the northern North-South seismic belt.

关 键 词：蒙古中部 重力异常 地震活动 地质构造 

分 类 号：P223[天文地球—大地测量学与测量工程]