In mid-2000, the USGS Southern California Earthquake Hazards Program office instituted a set of electronic mailing lists for public notifications of earthquakes. These mailing lists have proven to be quite popular and are currently up to about 13,000 subscribers. The figures here show the growth of the subscriber lists in response to felt and otherwise newsworthy earthquakes.1

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Figure 1 shows growth of the lists during 2001. The greatest growth occurred after a pair of M 4 events in the San Fernando Valley, a M 5.1 near Big Bear, the M 6.8 Nisqually event in Washington, and a M 4.2...

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