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陕西重力网优化改造及监测能力评估
Shaanxi gravity network optimization and monitoring capability assessment
- DOI:
- 作者:
- 曹建平1） 祝意青2） 韩美涛1） 李少睿1）
CaoJianping1)，zhuYiqing2)，HanMeitao1) and LiShaorui1)
- 作者单位:
- 1)中国西安 710068 陕西省地震局2）中国西安710054中国地震局第二监测中心
1 Earthquake Administration of Shaanxi Province，Xi'an 710068，China2 Second Crust Monitoring and Application Center，China Earthquake Administration，Xi'an 710054，China
- 关键词:
- 陕西重力网；区域重力场；重力基准；重力变化；监测能力
Shaanxi gravity monitoring network，local gravity field，gravity datum，gravity change，monitoring ability
- 摘要:
-
陕西重力网监测范围由关中盆地扩大到覆盖了鄂尔多斯块体南缘、关中盆地、秦岭山地及陕南、关中主要活动断裂带，同时与豫西、晋南、宁夏区域重力网实现了联网，测网监测能力由原来只具备对网内5级地震的监测提升到具备对发生在网内6级地震的监测。基于3个绝对重力基准约束下的重力观测平差结果表明，测网单位权中误差为7.7 ×10-8ms-2，平均点值中误差7.9 ×10-8ms-2，当以2.5倍中误差作为限差时，可以识别发生在监测区域内40×10-8ms-2左右的重力相对变化，为研究鄂尔多斯块体南缘重力场变化提供了依据。
Originally, the Shaanxi gravity monitoring network only covered Guanzhong basin. We extended it to southern margin of Ordos’s block, Guanzhong basin, Qinling mountainous area and the main active faults of southern Shaanxi, Guanzhong. Meanwhile, we carried out the monitoring work by combing the local gravity monitoring network of western Henan, southern Shanxi, and Ningxia. Therefore, the monitoring ability was improved from monitoring magnitude 5 earthquakes occurred within the network area to monitoring magnitude 6 earthquakes occurred within the network area. We processed the observation data based on a constraint of 3 absolute gravity data. The results indicate that the mean square error of unit weight is 7.7 ×10-8ms-2, and the average mean square error of observed points is 7.9 ×10-8ms-2. It can detect
the relative gravity change of 40 ×10-8ms-2 within the network area, when the tolerance is set as 2.5 times of mean square error. This monitoring ability provides a basis of studying gravity change in southern Ordos’s block.
