The relationship between in situ strain relaxation and outcrop fractures in the Potsdam Sandstone, Alexandria Bay, New York

Terry Engelder, Marc L. Sbar

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

In situ strain was measured by overcoring foil-resistance strain gauge rosettes bonded to five outcrops of Potsdam Sandstone near Alexandria Bay, New York. Strain relaxation magnitude and orientation correlated with the area of the intact outcrop outlined by intersecting vertical fractures. The maximum expansion occurred at the outcrop with the largest area between intersecting fractures. Outcrops with more than one set of longer, open fractures or more complicated fracture patterns have lower recoverable strains. Strain relaxation was lowest next to a postglacial pop-up. The orientation of the pop-up indicated relief of an ENE directed compression, the direction also observed as the maximum expansion at the outcrop yielding the largest strain relaxation.

Original languageEnglish (US)
Pages (from-to)41-55
Number of pages15
JournalPure and Applied Geophysics PAGEOPH
Volume115
Issue number1-2
DOIs
StatePublished - Jan 1 1977

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Strain relaxation
outcrops
sandstones
Sandstone
outcrop
sandstone
overcoring
Strain gages
expansion
Metal foil
strain gages
Postglacial
gauge
foils
relief
compression
in situ

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

Cite this

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abstract = "In situ strain was measured by overcoring foil-resistance strain gauge rosettes bonded to five outcrops of Potsdam Sandstone near Alexandria Bay, New York. Strain relaxation magnitude and orientation correlated with the area of the intact outcrop outlined by intersecting vertical fractures. The maximum expansion occurred at the outcrop with the largest area between intersecting fractures. Outcrops with more than one set of longer, open fractures or more complicated fracture patterns have lower recoverable strains. Strain relaxation was lowest next to a postglacial pop-up. The orientation of the pop-up indicated relief of an ENE directed compression, the direction also observed as the maximum expansion at the outcrop yielding the largest strain relaxation.",
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The relationship between in situ strain relaxation and outcrop fractures in the Potsdam Sandstone, Alexandria Bay, New York. / Engelder, Terry; Sbar, Marc L.

In: Pure and Applied Geophysics PAGEOPH, Vol. 115, No. 1-2, 01.01.1977, p. 41-55.

Research output: Contribution to journalArticle

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