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The quality of the tiltmeter data is comparable to that of the best horizontal component seismic data, recording some of the gravest free oscillations of the Earth, as well as successive passages of seismic surface waves circling the globe. We compare the observations with theoretical seismograms and with theoretical tilt. The predicted and observed surface wave tilt waveforms are very similar provided that we take into account horizontal acceleration effects on the tiltmeter. Phase and amplitude anomalies between the waveforms are well explained by the theoretical transfer function of the instrument. Likewise, observed horizontal seismograms converted into tilt match the tiltmeter data very well. Long\u2010base fluid tube tiltmeters could potentially contribute to obtain high\u2010quality measurements of the long\u2010period seismic spectrum.<\/jats:p>","DOI":"10.1029\/2006jb004311","type":"journal-article","created":{"date-parts":[[2006,11,16]],"date-time":"2006-11-16T21:38:44Z","timestamp":1163713124000},"source":"Crossref","is-referenced-by-count":17,"title":["Comparison of fluid tiltmeter data with long\u2010period seismograms: Surface waves and Earth's free oscillations"],"prefix":"10.1029","volume":"111","author":[{"given":"A. M. G.","family":"Ferreira","sequence":"first","affiliation":[{"name":"Department of Earth Sciences University of Oxford  Oxford UK"}]},{"given":"N. F.","family":"d'Oreye","sequence":"additional","affiliation":[{"name":"National Museum of Natural History and European Center for Geodynamics and Seismology  Luxembourg"}]},{"given":"J. H.","family":"Woodhouse","sequence":"additional","affiliation":[{"name":"Department of Earth Sciences University of Oxford  Oxford UK"}]},{"given":"W.","family":"Z\u00fcrn","sequence":"additional","affiliation":[{"name":"Black Forest Observatory, Schiltach, and University of Karlsruhe  Wolfach Germany"}]}],"member":"13","published-online":{"date-parts":[[2006,11,17]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1029\/RG024i003p00579"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1029\/97JB01586"},{"issue":"48","key":"e_1_2_8_4_1","article-title":"The current limits of resolution for surface wave tomography in North America","volume":"81","author":"Bassin C.","year":"2000","journal-title":"Eos Trans. 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