Geology

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Subject: search.filters.subject.receiver functions

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    Groundwater Variations from Autocorrelation and Receiver Functions
    (2019) Kim, Doyeon; Ved, Lekic
    This dataset supports the following research: Using a 20-year continuous broadband record and two independent single-station techniques – ambient noise autocorrelation and receiver functions – we document a relationship between subsurface seismic response and groundwater levels (GWL) in the Gulf Coast Aquifer System of southern Texas. We find that a surge of GWL following three consecutive hurricanes and documented at an adjacent monitoring well is accompanied with changes in receiver function power spectra and ambient noise autocorrelations. Using a simple physical model, we show that GWL changes should affect P- (VP) more strongly than S-wave (VS) velocities, consistent with our observations and previous ones based on inter-station correlations. Agreement between receiver function and ambient noise analyses shows that both can be used to reliably estimate temporal changes in subsurface properties on long timescales. Due to their sensitivity to VP, single-station techniques respond more strongly to GWL changes, making them useful for characterizing and monitoring aquifer systems.
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    Constraining Lithospheric Structure across the Continental Borderland using Receiver Functions
    (2014) Reeves, Zachary Anthony; Lekic, Vedran; Geology; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    Due to its complex history of deformation, which includes subduction, rifting, and transtensional motions, the California Continental Borderland provides an interesting geological setting for studying how the structure of oceanic and continental plates responds to deformation. We calculate Ps and Sp receiver functions at permanent stations of the Southern California Seismic Network as well as ocean bottom seismometer data gathered as part of the ALBACORE seismic experiment in 2010-2011. Our results indicate that the Outer Borderland has been translated with little to no internal deformation, while the Inner Borderland underwent significant crustal thinning to compensate for the 90 degree clockwise rotation of the western Transverse Range block. We detect an oceanic seismic lithosphere-asthenosphere boundary at 58 km depth west of the Patton Escarpment. Sp common conversion point stacks confirm wholesale lithospheric thinning of the Inner Borderland and suggest the presence of a slab fragment beneath the Outer Borderland.