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

Metadata Updated: October 28, 2023

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.

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Metadata Created Date June 1, 2023
Metadata Updated Date October 28, 2023

Metadata Source

Harvested from DOI EDI

Additional Metadata

Resource Type Dataset
Metadata Created Date June 1, 2023
Metadata Updated Date October 28, 2023
Publisher U.S. Geological Survey
Identifier USGS:5cb7c980e4b0c3b0065d8153
Data Last Modified 20200825
Category geospatial
Public Access Level public
Bureau Code 010:12
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Harvest Object Id 5cf7b524-ed93-4ba6-840c-6c7bf24646a2
Harvest Source Id 52bfcc16-6e15-478f-809a-b1bc76f1aeda
Harvest Source Title DOI EDI
Metadata Type geospatial
Old Spatial -68.82514,44.32901,-68.79519,44.35651
Publisher Hierarchy White House > U.S. Department of the Interior > U.S. Geological Survey
Source Datajson Identifier True
Source Hash 2bd61df6b176e8613582d5c3a5f040f365c8e575a803ba09e413507d58a8bca2
Source Schema Version 1.1
Spatial {"type": "Polygon", "coordinates": -68.82514, 44.32901, -68.82514, 44.35651, -68.79519, 44.35651, -68.79519, 44.32901, -68.82514, 44.32901}

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