| 首都圈地区重力变化及其映震能力 |
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| 引用本文： | 张晶,孟国杰.首都圈地区重力变化及其映震能力[J].地震地磁观测与研究,1996,17(2):61-67. |
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| 作者姓名： | 张晶 孟国杰 |
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| 作者单位： | 国家地震局综合观测中心，国家地震局分析预报中心 |
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| 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。
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| 关 键 词： | 流动重力测量，重力变化，映震能力 |
Gravity changes and its ability to reflect earthquakes in capital area |
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| Zhang Jing and Meng Guojie.Gravity changes and its ability to reflect earthquakes in capital area[J].Seismological and Geomagnetic Observation and Research,1996,17(2):61-67. |
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| Authors: | Zhang Jing and Meng Guojie |
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| Institution: | Zhang Jing and Meng Guojie1) |
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| Abstract: | 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. |
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| Keywords: | mobile gravity gravity change ability to reflect earthquakes |
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