Several tools provide access to SEED format data at the Locations, magnitude, phases, coda durations, and first-motion mechanisms Kinemetrics Basalt, Nanometrics Taurus, Reftek 130Īn earthquake catalog is produced from analysis of the NCSN data.3-component geophone seismometer (Oyo HS1).3-component broadband seismometer (Guralp CMG-3ESP, Streckheisen STS-2, Nanometrics Trillium Compact).Continuous and triggered telemetry to the USGS Menlo Park.Kinemetrics K2/Basalt, GeoSIG NetQuakes, Nanometrics Taurus/Trident, Reftek 130.3-component accelerometer (Kinemetrics EpiSensor or GeoSIG AC-63).Continuous telemetry to the USGS Menlo Park.Central site digitization and timing if analog.Vertical-component velocity sensor (Mark Products L-4).NCSN stations generally fall into 4 categories: short-period, broadband, Network Code: NC (also includes the Southern Hayward Fault Network) Typical Station Equipment The network also utilizes direct radio telemetry to Menlo Park, cellular data services, and operates an extensive LAN that links urban stations located in the San Francisco Bay region. The NCSN telemetry system utilizes local collection nodes which are linked to Menlo Park via a microwave system between Geyser Peak above Geyserville and Black Mountain near San Luis Obispo, satellite telemetry, and leased digital circuits. The remainder of the stations are mostly comprised of short-period vertical-component sensors. Nearly 60% of the stations in the network are now digital, and 24 of the digital stations have broadband sensors, 333 have strong-motion sensors, and 10 are borehole installations. It records a total of 1850 channels of data using a mix of digital and analog systems. The NCSN operates 580 stations in northern and central California and records an additional 159 stations maintained by the Southern California Seismic Network, Pacific Gas & Electric, the University of Nevada Reno, the California Department of Water Resources, Calpine/LBNL, and the California Geological Survey. However, earthquakes with M<1.0 are routinely detected throughout the network. Depending on the concentration of stations in a region, the magnitude (M) level at which earthquake detection is complete varies from approximately 1.0 in parts of the central Coast Ranges to 2.6 in the Klamath Mountain range. The network configuration was motivated by the need to monitor active faults and volcanoes with a station density sufficient to determine the focal depth of shallow (0-15 km) crustal earthquakes. The NCSN is designed to detect all local earthquakes having signal strength above the background level of microseisms. Geological Survey has operated the Northern California Seismic Network (NCSN) to provide earthquake data for a wide range of research topics and hazard-reduction activities. The magnitude, depth and time of the event can also be calculated from these recordings.Please see note on Timing problem at Mammoth analog stations. When multiple seismic stations record the same earthquake event it is then possible to calculate the location of the event using the principle of triangulation.
SEISMAC STATIONS SERIES
This vibration is then recorded on a seismograph as a series of wave motion lines called seismograms. A series of suspended and balanced pendulum-like masses remain stationary but move when the earth vibrates. These instruments which were first used to ‘listen’’ for ground vibrations from nuclear testing during World War II operate on the principle of inertia. Augustine, Trinidad, for real time processing and analysis.Įarthquakes which produce seismic waves are monitored using seismometers. Continuous data from nearly all stations is transmitted directly to our office in St. The UWI-SRC operates a network of over 60 seismic stations strategically positioned on islands throughout the Eastern Caribbean with access to approximately 100 from other regional agencies.
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