|Statement||J.G. Hayles, M.H. Serzu and G.S. Lodha.|
|Series||Technical record (Atomic Energy of Canada Ltd) -- 678|
|Contributions||Serzu, M.H., Lodha, G.S., Atomic Energy of Canada Limited.|
|The Physical Object|
|Pagination||56 p. :|
|Number of Pages||56|
The results of cross-hole seismic tomography at sites where there is good geological control are presented. Comparisons have been made between the tomograms and the geological cross sections in order to assess the technique under in situ conditions. It is shown that while the geological sections do not contain velocity information they have provided structural constraints which provided Cited by: 7. Cross-hole travel-time tomography surveys consist of registe- ring the ﬁrst arrival pulses of waves that travel through subsur- face between seismic sources and receivers (e.g. geophones, hy-. istic in seismic tomography. Measurement A seismic cross-hole tomographic survey was performed between borehole pairs Üh-2/Üh-4 and Üh-2/Üh To save the boreholes from damage by explosives other sources were required. The energy of the high-frequency sparker proved to be insufficient, so a Bolt-type airgun was used as impulse source. We performed field experiments at a well-studied aquifer test site to evaluate the geophysical method of seismic cross-hole tomography for high-resolution aquifer characterization.
A tomographic survey of 15 panels was performed under the La Gileppe dam (Belgium) to assess the degree of fracturing in the rock foundation which consists of steeply dipping beds of sandstone and shale. A particular aim of the study was to locate fracture zones likely to cause leakage under the dam. seismic cross-hole survey solgeo was founded in as a spin-off company from ismes spa (enel group, leader in the italian and international energy market) inhering its geophysical experience. solgeo can relies on a team of technicians (made by electronics engineers, geophysicists, computer scientists and other experts) with more than 25 years’ experience in the planning and execution of. This book provides a systematic review of tomographic applications in seismology and the future directions. Seismic Tomography: Theory and Practice crustal deep delay depth derived determined direct distance distribution Earth earthquakes effect equation errors estimate et al example experiment fault Figure frequency function Geophys. Maxwell and Young () coupled cross-hole seismic tomography with microseismic monitoring to locate zones of anomalous stress and zones of failure in Canada’s Lockerby Mine. Hydrophones with lat frequency response from 1Hz to 15 kHz were used as sensors and blasting caps were used as the seismic sources.
The seismic cross-hole experiment was carried out using a channel hydrophone string with a m receiver spacing and a sparker source with a central frequency of 2 kHz, fired. Crosshole seismic testing is a valuable technique for determining seismic velocity profiles for critical structure siting investigations. Improper field precedures, however, can result in the. cross-hole seismic surveys and single-hole acoustic velocity surveys to help to locate and define fractures in a granite. The surveys were done from the underground workings at AECL’s Underground Research Laboratory CURL) in June, The URL is located about km northeast of. Many tomographic interpretations of crosshole seismic traveltimes have approximated the raypaths with straight lines connecting the source and receiver. This approximation is valid where the velocity does not vary greatly, but in many regions of interest velocity variations of percent or more are observed, causing significant ray curvature.