USGS Geomagnetism Program
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下载链接：
https://www.fdsn.org/networks/detail/NT/
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资源简介：
The U.S. Geological Survey Geomagnetism Program monitors the Earth's magnetic field at 14 ground-based observatories in the United States. The Program provides continuous records of magnetic field variations from Fluxgate and Proton magnetometers.
提供机构：
International Federation of Digital Seismograph Networks
创建时间：
2017-10-27
