Dual Station Feeds

One of the major accomplishments in the first few years has been the establishment of ``dual station feeds" at 30 stations (15 in northern California and 15 in southern California) (Figure 4.2). To achieve this, the BSL and Caltech both ordered the DLCIs (data link connection identifier) that allow the 2nd center to establish a PVC to each station using the frame-relay network.

The Northern California Management Center is using data from the Southern California stations to estimate magnitudes on a routine basis. A subset of these stations are being used for the moment tensor inversions, a computation that is more sensitive to the background noise level.

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