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Regional seismic monitoring with SNDP

User Choice of Telemetry Method

Several factors are considered when choosing the type of telemetry that will be employed including initial budget, recurring costs, topography, and existing infrastructure. REF TEK's advanced seismic networks allow the scientist to choose the best telemetry method for a given set of circumstances without a complicated mix of hardware and without sacrificing the timeliness and quality of data.

Seismic Network Data Processor (SNDP)

SNDP is a vital component of REF TEK's advanced seismic networks. SNDP is a multitasking, scalable, open-architecture software package designed for UNIX computers/networks. SNDP provides real-time data collection and processing supporting interactive analysis of geophysical data from a spatially distributed network of sensors. The package includes interactive 3D graphics and geographical mapping tools. SNDP contains all data processing routines required to produce preliminary regional
seismic bulletins from small aperture seismic arrays and traditional regional networks. These routines include seismic event detection, phase identification estimation, event location, and event classification.

Traditional Regional Network versus Small Aperture Seismic Array

Traditional regional networks consist of a number of remote stations spaced across a given area. This configuration presents challenges in terms of cost required to support telemetry and remote station maintenance (logistics). A small aperture seismic array could be located in close proximity to the central recording station. For larger areas (greater than about 1500 km) multiple arrays could be installed. Due to the unique capabilities of SNDP, a small aperture seismic array is a viable alternative even in the presence of high ambient noise, such as in urban areas or near the seashore. SNDP accomplishes this through the use of adaptive beamforming algorithms which greatly enhance the signal to noise ratio.

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