HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) References Citation Map Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Lomnitz, C. Search for Related Content GeoRef GeoRef Citation

Frequency response of a strainmeter

Instituto de Geofisica, UNAM National University of Mexico, 04510 Mexico, D.F.

Abstract

The amplification of a strainmeter is frequency dependent. As the wavelength approaches the length L of the strainmeter, the amplitude vanishes, because the two extremes of the strainmeter are in phase. The sign of the response is inverted at zero crossings such that = L/n, n = 1, 2,.... Between L < < 2L, the amplitude of an incoming signal may be reduced by 60% or more. Filtering of the output may worsen the problem. Thus, strainmeters may be poorly suited for certain research purposes, including surface-wave studies and first-motion studies. The output of long-base strainmeters sited on low-velocity materials (such as the 732-m-long strainmeters at Piñon Flat Observatory) may require correction for amplitude distortion.

This article has been cited by other articles:

				C. Lomnitz and C.-j. Zhang Parkfield revisited: I. Data retrieval Lithosphere, August 1, 2009; 1(4): 227 - 234. [Abstract] [Full Text] [PDF]

				C. A. Langston Spatial Gradient Analysis for Linear Seismic Arrays Bulletin of the Seismological Society of America, February 1, 2007; 97(1B): 265 - 280. [Abstract] [Full Text] [PDF]

				The Energy Partitioning and the Diffusive Character of the Seismic Coda Bulletin of the Seismological Society of America, June 1, 2000; 90(3): 655 - 665.