首都圈地区重力变化及其映震能力

英文篇名：Gravity changes and its ability to reflect earthquakes in capital area
中文刊名：地震地磁观测与研究
英文刊名：SEISMOLOGICAL AND GEOMANGNETIC OBSERVATION AND RESEARCH
作者：张晶 ; 孟国杰
英文作者：Zhang Jing and Meng Guojie1)(Comprehensive Surveying Center ; State Seismological Bureau ; Beijing 100039 ; China)2) (Center for Analysis and prediction ; State Seismological Bureau ; Beijing 100036 ; China)
中文关键词：流动重力测量 ; 重力变化 ; 映震能力
英文关键词：mobile gravity ; gravity change ; ability to reflect earthquakes
出版日期：1996-04-25
机构：国家地震局综合观测中心，国家地震局分析预报中心
年：1996
期：02
出版单位：地震地磁观测与研究

摘要

对首都圈流动重力观测成果进行非潮汐信息的提取，得到了首都圈地区１９８４—１９９３年期间的重力动态变化图像，认为重力变化与区域构造活动有一定的相关性。以大于２倍均方差作为异常判断标准，统计了北京小网的段差重力异常与地震的对应关系。结果表明：对于测网内发生的４级左右的地震，有异常出现的段差数占总数的１６．９％，对于距测网１００ｋｍ以内发生的５级以上的地震有异常出现的段差数占总数的３７．５％。西北部测环的段差异常出现率比南部和东北部高。
By extracting of non-tide information of the mobile gravity data in capital area, we obtained dynamic gravity patterns from 1984 to 1993.We think that the gravity changes have certain relation to tectonic activity in this area. Taking gravity changes more than 2 times of R.M.S as standard to judge anomaly, we studied the corresponding relation between gravity anomalies and earthquakes by statistics method.Result shows that, for the Ms>4.0 earthquakes occurred within the network, the ratio of the number of gravity difference anomalies to that of total gravity difference is 16.7%, for the earthquakes of more than 5 magnitude, whose epicentres are within 100km to the network,the ratio of the number of gravity difference anomalies to that of total gravity difference is 37.5%.The ratio of anomaly of surveying circles in north-western part is higher than that of surveying circles in southern part and north-eastern part.

引文

陈益惠、孔祥红、宋胜合，1991．构造变形引起重力非潮汐变化的研究，地震预报方法实用化研究文集──形变、重力、应变专辑，北京：地震出版社．华昌才、沈晶、郭凤义、张征宇，1987．京津唐地区的重力变化，地震学报，9，3，319－325．国家地震局，深部物探成果纪写组，1986．中国地壳上地幔地球物理探测成果，北京：地震出版社．林伟凡，1991．京津冀地区隐伏构造与地震活动，地展预报研究，第三辑，北京：地震出版社．陶本藻，1984．自由网平差与变形分析，北京：测绘出版社．吴兵、马丽，1982．断层活动与重力段差变化关系的探讨，地震，2，28—30．