Monitoring a Building Using Deconvolution Interferometry. II: Ambient-Vibration Analysis

Abstract

Research Article| November 26, 2013 Monitoring a Building Using Deconvolution Interferometry. II: Ambient‐Vibration Analysis Nori Nakata; Nori Nakata aDepartment of Geophysics, Stanford University, 397 Panama Mall, Stanford, California [e-mail] Search for other works by this author on: GSW Google Scholar Roel Snieder Roel Snieder bCenter for Wave Phenomena, Department of Geophysics, Colorado School of Mines, 1500 Illinois Street, Golden, Colorado [e-mail] Search for other works by this author on: GSW Google Scholar Author and Article Information Nori Nakata aDepartment of Geophysics, Stanford University, 397 Panama Mall, Stanford, California [e-mail] Roel Snieder bCenter for Wave Phenomena, Department of Geophysics, Colorado School of Mines, 1500 Illinois Street, Golden, Colorado [e-mail] Publisher: Seismological Society of America First Online: 14 Jul 2017 Online ISSN: 1943-3573 Print ISSN: 0037-1106 Bulletin of the Seismological Society of America (2014) 104 (1): 204–213. https://doi.org/10.1785/0120130050 Article history First Online: 14 Jul 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Nori Nakata, Roel Snieder; Monitoring a Building Using Deconvolution Interferometry. II: Ambient‐Vibration Analysis. Bulletin of the Seismological Society of America 2013;; 104 (1): 204–213. doi: https://doi.org/10.1785/0120130050 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyBulletin of the Seismological Society of America Search Advanced Search Abstract Application of deconvolution interferometry to earthquake data recorded inside a building is a powerful technique for monitoring parameters of the building, such as velocities of traveling waves, frequencies of normal modes, and intrinsic attenuation. In this study, we apply interferometry to ambient‐vibration data, instead of using earthquake data, to monitor a building. The time continuity of ambient vibrations is useful for temporal monitoring. We show that, because multiple sources simultaneously excite vibrations inside the building, the deconvolved waveforms obtained from ambient vibrations are nonzero for both positive and negative times, unlike the purely causal waveforms obtained from earthquake data. We develop a string model to qualitatively interpret the deconvolved waveforms. Using the synthetic waveforms, we find the traveling waves obtained from ambient vibrations propagate with the correct velocity of the building, and the amplitude decay of the deconvolved waveforms depends on both intrinsic attenuation and ground coupling. The velocities estimated from ambient vibrations are more stable than those computed from earthquake data. Because the acceleration of the observed earthquake records varies depending on the strength of the earthquakes and the distance from the hypocenter, the velocities estimated from earthquake data vary because of the nonlinear response of the building. From ambient vibrations, we extract the wave velocity due to the linear response of the building. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.