Northern California Seismic Network (NCSN) data: Northern California Earthquake Data Center (NCEDC)

It records a total of 924 channels of data using a mix of digital and analog systems. Nearly one fourth of the stations in the network are now digital, and 11 of the digital stations have broadband sensors, 92 have strong-motion sensors, and 11 are borehole installations. The remainder of the stations are mostly comprised of short-period vertical-component sensors.

The NCSN telemetry system utlizes local collection nodes which are linked to Menlo Park via analog microwave, digital satellite telemetry, and leased digital circuits. The network also utilizes direct radio telemetry to Menlo Park and operates an extensive LAN that links urban stations located in the San Francisco Bay region. NCSN network geometry is illustrated in a map of northern and central California located at the following URL: "quake.geo.berkeley.edu/ncsn/map.html".

Data Access: An earthquake catalog is produced from analysis of the NCSN data. Locations, magnitude, phases, coda durations, and first-motion mechanisms are available using the earthquake catalog search, "quake.geo.berkeley.edu/ncedc/catalog-search.html". At this point in time, NCSN waveform data are not available in SEED format.

However, effort is underway to provide this capability. For the present, NCSN waveform data are available through the EVT_FAST waveform request form, "quake.geo.berkeley.edu/ncedc/evt_fast_form.html", or through research accounts.