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A sea-level recorder for tectonic studiesIn the past tide gauges have provided valuable information concerning the vertical ground deformation associated with major earthquakes. Although tide-gauge data contains numerous sources of noise, a spacing of less than 40 km between gauges is indicated for a useful study of dilatant behavior, and a spacing of less than 80 km may be adequate for the study of crustal downwarping in island arcs. An inexpensive tide gauge which is designed to provide a continuous record of sea level with a measurement precision of 1 mm is described. Hydraulic filtering is incorporated into the instrument to attenuate daily tides relative to longer period variations of sea level. The instrument is designed to operate from flashlight batteries for a year unattended and to withstand temporary submersion as might be caused by tsunamis. Several of these sea-level recorders have been installed in seismic gaps in the Aleutians and in the Caribbean.
Document ID
19770059848
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Bilham, R.
(Lamont-Doherty Geological Observatory Palisades, N.Y., United States)
Date Acquired
August 9, 2013
Publication Date
March 1, 1977
Publication Information
Publication: Geophysical Journal
Volume: 48
Issue: 3, Ma
Subject Category
Instrumentation And Photography
Accession Number
77A42700
Funding Number(s)
CONTRACT_GRANT: NOAA-03-5-022-70
CONTRACT_GRANT: NSG-5072
Distribution Limits
Public
Copyright
Other

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