GeoPebble: A Wireless Seismic and Geophysical Sensor Web
A seismic sensing system composed of independent nodes (Geopebbles) that communicate wirelessly has been developed. With each node containing a transducer, digitizer, microprocessor, timing and control unit, power system, and wireless transmitter and receiver, a two-dimensional array can be deployed (manually or automatically with robots) to provide an additional degree of information compared to conventional linear arrays. Field tests with a small number of Geopebbles have validated the concept and provided seismic data comparable to or superior to data collected using convention hardware. CReSIS funding at Penn State University is being used to produce six fully functional prototype units that will form the basis of the full GeoPebble network.
To speed and facilitate the acquisition of multi-channel seismic reflection data in the polar regions, a prototype seismic streamer system has been developed by CReSIS at the University of Kansas. This system consists of an array of seismic sensors (geophones) mounted on aluminum base plates towed behind a ground vehicle. The streamer can be used for single component vertical motion recording (P wave), or three-component, vertical and horizontal motion recording (P, SH and SV). Once the streamer is positioned at the desired location, a seismic excitation (typically a buried explosive charge) can be triggered and the array can record seismic data. Within minutes the streamer can be moved to its next position and is ready to record. Field tests in Greenland and Antarctica show results comparable to or superior to the conventional manual geophone deployment techniques, which require orders of magnitude more time to deploy.
This material is based upon work supported by the National Science Foundation under Grant No. ANT-0424589. Any opinions, findings, and conclusions or recommendations
expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.