2D seismic imaging in the Susquehanna Shale Hills Critical Zone Observatory: New constraints on subsurface structure and weathering
Abstract
In June 2018, we conducted a large-scale seismic survey involving 2100 seismometers deployed at a 2-meter spacing in the Susquehanna Shale Hills Critical Zone Observatory (SSHCZO) in central Pennsylvania. Over 1000 sledgehammer shots were made in between the instruments, with an additional 60 shots spread throughout the deployment made with a shotgun source, yielding a dataset of over 4 million waveforms. In this study, data from 200m and 400m-long 2D profiles in the seismic survey are being modeled to obtain high resolution P-wave velocity images of the critical zone. The profiles cross two ridges with a valley in between, spanning the watershed north to south. The 200m profile intersects two approximately 30 m deep boreholes. P-wave arrival times are being modeled using several inversion methods to determine model resolution and explore the limitations of 2D travel-time tomography for imaging the critical zone in regions of significant topographic relief. Final results will be validated against geophysical logs from the boreholes and then used to infer weathering patterns away from the boreholes.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFMNS23A..02M
- Keywords:
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- 0439 Ecosystems;
- structure and dynamics;
- BIOGEOSCIENCES;
- 1625 Geomorphology and weathering;
- GLOBAL CHANGE;
- 1829 Groundwater hydrology;
- HYDROLOGY;
- 1835 Hydrogeophysics;
- HYDROLOGY