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Ambient noise as the new source for urban engineering seismology and earthquake engineering: a case study from Beijing metropolitan area

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Earthquake Science 2014年第1期27卷 89-100页

作者： Lanbo Liu Qi-fu Chen Weijun Wang Eric Rohrbach Department of Civil & Environmental Engineering University of Connecticut Institute of Earthquake Science China Earthquake Administration Institute of Geology and Geophysics Chinese Academy of Sciences

In highly populated urban centers, traditional seismic survey sources can no longer be properly applied due to restrictions in modern civilian life styles. The ambient vibration noise, including both microseisms and microtremor, though are generally weak but available anywhere and anytime, can be an ideal supplementary source for conducting seismic surveys for engineering seismology and earthquake engineering. This is funda- mentally supported by advanced digital signal processing techniques for effectively extracting the useful information out from the noise. Thus, it can be essentially regarded as a passive seismic method. In this paper we first make a brief survey of the ambient vibration noise, followed by a quick summary of digital signal processing for passive seismic surveys. Then the applications of ambient noise in engi- neering seismology and earthquake engineering for urban settings are illustrated with examples from Beijing metro- politan area. For engineering seismology the example is the assessment of site effect in a large area via microtremor observations. For earthquake engineering the example is for structural characterization of a typical reinforced con- crete high-rise building using background vibration *** showing these examples we argue that the ambient noise can be treated as a new source that is economical, practical, and particularly valuable to engineering seis- mology and earthquake engineering projects for seismic hazard mitigation in urban areas.

关键词： Ambient noise resonance frequency -ground motion amplification Seismic vulnerability ~Horizontal to vertical spectra/ratio (HVSR) ~Seismic interferometry (SI) ~ Beijing metropolitan area

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