DOI: 10.1002/2016GL070088
论文题名: Anthropogenic sources stimulate resonance of a natural rock bridge
作者: Moore J.R. ; Thorne M.S. ; Koper K.D. ; Wood J.R. ; Goddard K. ; Burlacu R. ; Doyle S. ; Stanfield E. ; White B.
刊名: Geophysical Research Letters
ISSN: 0094-8601
EISSN: 1944-8332
出版年: 2016
卷: 43, 期: 18 起始页码: 9669
结束页码: 9676
语种: 英语
英文关键词: ambient vibration
; lake microseism
; modal analysis
; natural bridge
; Rainbow Bridge, Utah
; structural health monitoring
Scopus关键词: Earthquakes
; Geophysics
; Lakes
; Modal analysis
; Natural frequencies
; Reservoirs (water)
; Resonance
; Seismology
; Structural health monitoring
; Ambient vibrations
; Anthropogenic sources
; Artificial reservoirs
; Broad-band seismometers
; Fundamental modes
; Rainbow Bridge, Utah
; Structural fatigue
; Vibrational modes
; Vibration analysis
英文摘要: The natural modes of vibration of bedrock landforms, as well as the sources and effects of stimulated resonance remain poorly understood. Here we show that seismic energy created by an induced earthquake and an artificial reservoir has spectral content coincident with the natural modes of vibration of a prominent rock bridge. We measured the resonant frequencies of Rainbow Bridge, Utah using data from two broadband seismometers placed on the span, and identified eight distinct vibrational modes between 1 and 6 Hz. A distant, induced earthquake produced local ground motion rich in 1 Hz energy, stimulating a 20 dB increase in measured power at the bridge's fundamental mode. Moreover, we establish that wave action on Lake Powell, an artificial reservoir, generates microseismic energy with peak power ~1 Hz, also exciting resonance of Rainbow Bridge. These anthropogenic sources represent relatively new energy input for the bridge with unknown consequences for structural fatigue. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84988810592&doi=10.1002%2f2016GL070088&partnerID=40&md5=fa560fa036d0cb1a8d31fe40fa969c18
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9564
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Geology and Geophysics, University of Utah, Salt Lake City, UT, United States
Recommended Citation:
Moore J.R.,Thorne M.S.,Koper K.D.,et al. Anthropogenic sources stimulate resonance of a natural rock bridge[J]. Geophysical Research Letters,2016-01-01,43(18).