This is the NGF portal for MT and other EM data sets of interest to NGF members. Non NGF members are asked to register with the NGF prior to searching for data sets through this portal service.
Currently the NGF provides links to the Incorporated Research Institutions for Seismology (IRIS) Data Management Center (DMC) SPUD catalog of MT transfer functions. This is the primary data archive and distribution point for MT data sets collected from EarthScope and other National Science Foundation supported research programs. Please see the "NGF Request/Info -> Download Data -> IRIS DMC" menu item on the left.
In the future, the NGF may provide links to other data repositories as well, so please check back from time-to-time.