Continuous Seismic Profiling (CSP) at Callahan Mine Site: May 2017 to July 2018

Citation

Johnson, C.D., White, E.A., Phillips, S.N., Pappas, K.L, and Degnan, J.R., 2020, Borehole, Surface and Water-Borne Geophysical Surveys at the Callahan Mine Superfund Site in Brooksville, Maine: October 2016 to July 2018: U.S. Geological Survey data release, https://doi.org/10.5066/P9QS925T.

Summary

In May 2017 and July 2018, continuous seismic profiling (CSP) surveys were collected in Goose Pond at the Callahan Mine site. The chirp frequency CSP tool was used in the deep water. A tuned transducer (dual-echo sounder) was used in the shallow water, and the data are served separately but within this data release (See CSP-DSO). CSP methods use an acoustic sound source that travels through the water column, reflects off the bottom and sub-bottom layers and is received at the transducer. Using a water column velocity, the two-way travel time can be converted to distance. CSP methods provide the depth to water bottom, and when sufficient signal penetration can be achieved, CSP can be used to delineate the depth and topography of the subbottom layers and/or the bedrock surface. In a limited number of places, the bedrock surface was observed in the CSP record, creating a discontinuous and sporadic image of the bedrock surface. Some profiles exhibited multiple stratigraphic layers. The interpretation of subsurface in the seismic record generally matched depths to till or bedrock observed in core data (when/where the signal penetrated the subbottom). However, in many places, CSP surveys were adversely affected by a highly reflective water bottom, which caused strong multiples in the seismic record and limited to no depth of penetration. These multiples are attributed to the signal reflecting off of an acoustically hard layer caused by entrapped gas (methane) in the sediments, compacted sediments, or bedrock. The returning signal reflects off of the water/air interface, returns to the acoustic hard layer and reverberates between these two interfaces.

Contacts

Attached Files

Click on title to download individual files attached to this item.

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4000.006-CH1.PNG “CSP Profile at the Callahan Mine Site”		1.69 MB	image/png
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4000.007.sgy “SEGY_CSP_4000.007”		40.24 MB	application/unknown
4000.005.sgy “SEGY_CSP_4000.005”		68.48 MB	application/unknown
4000.006.sgy “SEGY_CSP_4000.006”		76.87 MB	application/unknown
4000.004.sgy “SEGY_CSP_4000.004”		250.88 MB	application/unknown
4000.008.sgy “SEGY_CSP_4000.008”		49.98 MB	application/unknown
4000.009.sgy “SEGY_CSP_4000.009”		47.41 MB	application/unknown
4000.010.sgy “SEGY_CSP_4000.010”		112.55 MB	application/unknown
6000.000.sgy “SEGY_CSP_6000.000”		75.68 MB	application/unknown
6000.001.sgy “SEGY_CSP_6000.001”		118.95 MB	application/unknown
6000.002.sgy “SEGY_CSP_6000.002”		36.35 MB	application/unknown
4000.011.sgy “SEGY_CSP_4000.011”		16.14 MB	application/unknown
4000.013.sgy “SEGY_CSP_4000.013”		29.28 MB	application/unknown
4000.014.sgy “SEGY_CSP_4000.014”		252.04 MB	application/unknown
5000.002.sgy “SEGY_CSP_5000.002”		264.87 MB	application/unknown
5000.003.sgy “SEGY_CSP_5000.003”		38.44 MB	application/unknown
5000.004.sgy “SEGY_CSP_5000.004”		60.03 MB	application/unknown
5000.006.sgy “SEGY_CSP_5000.006”		83.82 MB	application/unknown
5000.005.sgy “SEGY_CSP_5000.005”		140.42 MB	application/unknown
5000.007.sgy “SEGY_CSP_5000.007”		94.3 MB	application/unknown
5000.008.sgy “SEGY_CSP_5000.008”		188.5 MB	application/unknown
5000.009.sgy “SEGY_CSP_5000.009”		93.07 MB	application/unknown
5000.010.sgy “SEGY_CSP_5000.010”		62.63 MB	application/unknown
5000.011.sgy “SEGY_CSP_5000.011”		118.27 MB	application/unknown
4000.001.sgy “SEGY_CSP_4000.001”		135.91 MB	application/unknown
4000.003.sgy “SEGY_CSP_4000.003”		69.21 MB	application/unknown
CSP_Archive_elements_Callahan_Mine.pdf “Archive notes for CSP”		103.65 KB	application/pdf
CSP_Chirp_archive-notes_Callahan-Mine.pdf		120.44 KB	application/pdf
ReadMe_CSP-Chirp_Callahan-Mine.txt “Readme file with list of files”		5.92 KB	text/plain
CSP_Callahan-Mine.xml Original FGDC Metadata	View	11.94 KB	application/fgdc+xml

Purpose

The geophysical data were collected to characterize mine waste and glaciomarine deposits in and around the site of the former Callahan Mine in Brooksville, Maine. Continuous seismic profiling methods can provide the depth to the water bottom and delineate the depth and topography of the bedrock surface and subbottom layers.

Continuous Seismic Profiling (CSP) at Callahan Mine Site: May 2017 to July 2018

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