An EM Survey Around the Martha's Vineyard Observatory

Abstract

We have completed a series of survey lines around the Martha's Vineyard observatory (MVCO) site with a towed seafloor electromagnetic (EM) system. The system measures seafloor porosity to depths of about 20m below the seafloor. Our data show porosity responses from a number of relict channels which are offshore extensions of ponds seen on the Vineyard and which are thought to be glacial sapping valleys. The main node of the MVCO sits within the confines of one such channel, the offshore extension of Edgartown Great pond. Our data were, as far as logistically feasible, coincident with chirp seismic lines collected the previous summer, and also crossed a number of coring locations and places where a resistivity probe had been deployed. Comparison of our data with these other physical and geophysical data sets will be the subject of further work.

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Document Details

Document Type
Technical Report
Publication Date
Nov 20, 2003
Accession Number
ADA418420

Entities

People

  • Robert L. Evans

Organizations

  • Woods Hole Oceanographic Institution

Tags

DTIC Thesaurus Topics

  • Abstracts
  • Acquisition
  • Amplitude
  • Data Sets
  • Frequency
  • High Resolution
  • Magnetic Fields
  • Materials
  • Measurement
  • Observatories
  • Offshore
  • Physical Properties
  • Porosity
  • Regions
  • Seabed
  • Seismic Reflection
  • Surveys

Readers

  • Coastal Oceanography
  • Educational Psychology