Long-period or broadband data from global stations or small aperture arrays have traditionally been used to study the Earth's deep interior. However, recent seismic studies have shown that regional seismic networks can be an important tool in high- resolution studies of the upper mantle, coremantle boundary, and the inner and outer core, as well as the earthquake source.
Although these networks were established to monitor regional earthquakes, many have systematically archived seismograms from distant earthquakes that provide a wealth of information on the Earth's deep interior.
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