Scientists have long sought accurate monitoring of seismic activity to identify natural phenomena such as earthquakes, volcanic eruptions and the leakage of fluids stored deep underground. Time-lapse four-dimensional seismic monitoring surveys that employ an active seismic source can accurately map the subsurface, and comparing results from different surveys can show how fluids such as CO2 move in deep geological reservoirs. However, the expense of such surveys limits how often data can be gathered, meaning that subsequent analysis often has poor temporal resolution. An alternative that provides a continuous dataset is the passive monitoring of ambient seismic noise, but the accuracy of this approach depends on the ambient sources, which can change over time.
In an article recently published in Geophysics, a team of researchers from Kyushu University and industrial and governmental representatives from Japan and Canada report a new method for accurately monitoring the shallow subsurface at a high spatiotemporal resolution. The method was developed using data from 2014 to 2016 that was collected by the Accurately Controlled Routinely Operated Signal System (ACROSS) located at the Aquistore CO2 storage site in Saskatchewan, Canada.
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Tatsunori Ikeda, Takeshi Tsuji, Masashi Nakatsukasa, Hideaki Ban, Ayato Kato, Kyle Worth, Don White, and Brian Roberts. Imaging And Monitoring Of The Shallow Subsurface Using Spatially Windowed Surface-Wave Analysis With A Single Permanent Seismic Source. Geophysics. https://doi.org/10.1190/geo2018-0084.1
Tatsunori Ikeda, Takeshi Tsuji, Masashi Nakatsukasa, Hideaki Ban, Ayato Kato, Kyle Worth, Don White, and Brian Roberts. Imaging And Monitoring Of The Shallow Subsurface Using Spatially Windowed Surface-Wave Analysis With A Single Permanent Seismic Source. Geophysics. https://doi.org/10.1190/geo2018-0084.1
