High-Resolution Seismic Imaging of the Chesapeake Bay Impact Inner Crater Rim Stratigraphy

Details High-Resolution Seismic Imaging of the Chesapeake Bay Impact Inner Crater Rim Stratigraphy High-Resolution Seismic Imaging of the Chesapeake Bay Impact Inner Crater Rim Stratigraphy

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusmns14a..05v&link_type=abstract

American Geophysical Union, Spring Meeting 2004, abstract #NS14A-05

Other

0935 Seismic Methods (3025), 5420 Impact Phenomena (Includes Cratering), 7205 Continental Crust (1242)

Scientific paper

Results from a high-resolution seismic reflection experiment across the inner crater rim of the Chesapeake Bay Impact Crater (CBIC) will be presented. This crater is the seventh largest impact crater on Earth, formed during the Late Eocene when a meteorite struck the eastern continental shelf of North America. Although the impact structure is exceptionally well preserved, it is buried by about 500 m of post-impact deposits and cannot therefore be studied directly. The objective of this project was to image the transition from the inner to outer crater of the CBIC and to study the effect of the impact on the pre-impact stratigraphy and post-impact deposition on the continental shelf. About 3.4 km of seismic reflection data were collected in 3 profiles near Exmore, Virginia. One profile was acquired using a 120-geophone array at 5 m spacing. The other 2 profiles were collected using 24 channels at 10 m spacing. The source was a Betsy seisgun and sensors were 40-Hz geophones. Data were processed using Globe Claritas software. The resulting seismic sections show continuous and strong reflections down to 400-500 ms. These reflections show the post-impact stratigraphy, with a strong reflection from the top of the Chickahominy Formation at about 400 ms. Reflections from the syn-impact section are discontinous with significant scattering. Processing, as yet, has been unable to bring out any basement reflections.

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