The main tasks of this group are to set up and operate the data center to analyze the OHP Network data ( in cooperation with the other groups ). The data center is the link between the Ocean Hemisphere Network and the users of the network data, and contributes to uniform coverage of geophysical networks over the globe through international data exchange. The OHP network and networks operated by other countries are giving the geophysical community new, high-resolution images of the earth's interior. However, in order to take full advantage of the data from these new networks, we also need more accurate and efficient methods for analyzing the data. One example of our research in this area is our development of the Direct Solution Method ( DSM ) for computing synthetic seismograms. All software developed by our group will be made freely available to other researchers.