基于自参考方法求取地磁测深响应函数

C-responses functions estimation of geomagnetic data based on self-reference method

地磁测深是了解地球深部结构的一种有效手段。为了进行地磁数据的反演,通常将地磁台站记录的时间序列磁场信号转换为C-响应函数。三维地磁测深反演结果的分辨率与地磁台站的分布和C-响应的质量密切相关。稀疏的国际地磁台站直接导致全球三维反演结果分辨率较低。中国地区拥有世界上相对较密的地磁台阵。充分利用地磁观测数据,提高响应函数质量,对于提高地磁数据反演分辨率有着重要意义。采用基于Robust技术的Bounded Influence方法,并以自参考方式进行地磁数据处理,从而得到单一台站的C-响应。对中国地区部分地磁台站记录数据进行C-响应计算,获取稳定的响应曲线。因此,基于Bounded Influence方法的C-响应求取技术能够获取更加稳定、可靠的响应数据。本方法可为科研工作者进行相关研究提供帮助。

Geomagnetic depth sounding is an effective tool to study the deep structure of the earth.In order to invert the geomagnetic data,we usually convert the time series of magnetic field signals of the geomagnetic observatories to the C-responses function.We collect data from more than 50 geomagnetic observatories in China.In order to make full use of these station data and obtain more ideal C-responses functions,we modify the Bounded Influence method proposed by Chave to obtain the C-responses of the geomagnetic depth by changing the remote reference mode to self-reference mode to obtain the C-response for a single station.It is proved that the C-responses method introduced in this paper can get a more stable C-responses curve.At the same time,examples of C-response processing of geomagnetic stations in China are given,which provides a basis for future research.