Anomalous Shallow Seismic Velocities in Mackenzie Bay, Northwest Territories

Upper Mississippi embayment shallow seismic velocities measured in situ

Engineering Geology ◽

10.1016/s0013-7952(97)00009-4 ◽

1997 ◽

Vol 46 (3-4) ◽

pp. 313-330 ◽

Cited By ~ 16

Author(s):

Hsi-Ping Liu ◽

Yiguang Hu ◽

James Dorman ◽

Tzyy-Shiou Chang ◽

Jer-Ming Chiu

Keyword(s):

Seismic Velocities ◽

Mississippi Embayment ◽

Shallow Seismic ◽

Upper Mississippi Embayment

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A vertical array method for shallow seismic refraction surveying of the sea floor

Geophysics ◽

10.1190/1.1442775 ◽

1990 ◽

Vol 55 (1) ◽

pp. 92-96 ◽

Cited By ~ 8

Author(s):

J. A. Hunter ◽

S. E. Pullan

Keyword(s):

Seismic Refraction ◽

Research Interest ◽

Seismic Velocities ◽

Vertical Array ◽

Sea Floor ◽

Site Investigations ◽

Shallow Seismic ◽

Continental Shelves ◽

Defense Research ◽

Research Studies

In recent years, specific requirements of offshore geotechnical site investigations, as well as detailed defense research studies, have stimulated research interest in methods for measuring seismic velocities of sea‐floor sediments on the continental shelves. Investigations have used wide‐angie subbottom reflection measurements (McKay and McKay, 1982), bottom‐laid refraction cables (Hunter et al., 1979), and towed refraction arrays, both on the surface (Hunter and Hobson, 1974) and at depth (Fortin et al., 1987; Fagot, 1983).

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Shallow seismic surveys, Mackenzie Valley, Northwest Territories and Ste-Scholastique, Quebec

10.4095/105306 ◽

1972 ◽

Author(s):

R M Gagne ◽

J A Hunter

Keyword(s):

Northwest Territories ◽

Seismic Surveys ◽

Shallow Seismic

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Imaging and monitoring of the shallow subsurface using spatially windowed surface-wave analysis with a single permanent seismic source

Geophysics ◽

10.1190/geo2018-0084.1 ◽

2018 ◽

Vol 83 (6) ◽

pp. EN23-EN38 ◽

Cited By ~ 4

Author(s):

Tatsunori Ikeda ◽

Takeshi Tsuji ◽

Masashi Nakatsukasa ◽

Hideaki Ban ◽

Ayato Kato ◽

...

Keyword(s):

Surface Wave ◽

Temporal Stability ◽

Spatial Variations ◽

Storage Site ◽

Seismic Velocities ◽

Wave Analysis ◽

Spatiotemporal Resolution ◽

Shallow Subsurface ◽

Phase Velocities ◽

Shallow Seismic

Development of shallow subsurface monitoring systems is important for monitoring the ground stability of shallow formation, and also for conventional deep seismic monitoring because with current techniques, temporal changes in shallow seismic velocities can influence monitoring results for the deep subsurface. We have developed an effective shallow seismic imaging and monitoring system with high spatiotemporal resolution and accuracy using a continuous and controlled source system, the accurately controlled routinely operated signal system (ACROSS). The method applies surface-wave analysis to characterize and monitor the shallow subsurface from the spatiotemporal variation of phase velocities. Because the number of available ACROSS units is usually limited, estimating a shallow subsurface with high spatial resolution is a challenging issue in ACROSS-based monitoring. To overcome this problem, we introduced a 2D spatial window into multichannel analysis of surface waves. We analyzed continuous ACROSS data acquired during seven different data periods from 2014 to 2016 at the Aquistore [Formula: see text] storage site in Canada. As a result, we clearly estimated spatial variations of phase velocities using only a single ACROSS unit. The numerical experiments of our method suggested that the spatial variations could be associated with shallow geologic boundaries in the study area. We identified clear seasonal variations of phase velocities in winter, possibly related to ground freezing in shallow sediments, and we showed the high temporal stability of our monitoring approach in warmer seasons. These results indicated that our approach would have the potential to identify spatiotemporal change in shallow subsurface associated with natural phenomena or fluid leakage.

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