scholarly journals Deformation at depth associated with the 12 May 2008 MW 7.9 Wenchuan earthquake from seismic ambient noise monitoring

2013 ◽  
Vol 40 (1) ◽  
pp. 78-82 ◽  
Author(s):  
B. Froment ◽  
M. Campillo ◽  
J.H. Chen ◽  
Q.Y. Liu
Keyword(s):  
Wenchuan Earthquake ◽  
Ambient Noise ◽  
Seismic Ambient Noise

Meteorological conditions influence on quantification of site effects at low frequency using the seismic ambient noise

2015 ◽  
Author(s):  
Rabah Bensalem* ◽  
Djamal Machane ◽  
Jean-Luc Chatelain ◽  
Mohamed Djeddi ◽  
Hakim Moulouel ◽  
...  
Keyword(s):  
Site Effects ◽  
Ambient Noise ◽  
Low Frequency ◽  
Meteorological Conditions ◽  
Seismic Ambient Noise

scholarly journals Acoustic and seismic ambient noise measurements in urban and rural areas

2017 ◽  
Vol 119 ◽  
pp. 135-143 ◽  
Author(s):  
Donald G. Albert ◽  
Stephen N. Decato
Keyword(s):  
Rural Areas ◽  
Ambient Noise ◽  
Seismic Ambient Noise ◽  
Noise Measurements ◽  
Urban And Rural Areas

scholarly journals Landslide monitoring using seismic ambient noise correlation: challenges and applications

2021 ◽  
pp. 103518
Author(s):  
Mathieu Le Breton ◽  
Noélie Bontemps ◽  
Antoine Guillemot ◽  
Laurent Baillet ◽  
Éric Larose
Keyword(s):  
Ambient Noise ◽  
Landslide Monitoring ◽  
Noise Correlation ◽  
Seismic Ambient Noise

Recurrent rock avalanches progressively dismantle mountain ridges in the Longmen Shan, China, most recently in the 2008 Wenchuan earthquake

2021 ◽  
Author(s):  
Janusz Wasowski ◽  
Maurice McSaveney ◽  
Luca Pisanu ◽  
Vincenzo Del Gaudio ◽  
Yan Li ◽  
...  
Keyword(s):  
Wenchuan Earthquake ◽  
Ambient Noise ◽  
Slope Failure ◽  
Mass Movement ◽  
Rock Avalanche ◽  
Ground Vibration ◽  
Source Area ◽  
Slope Failures ◽  
Rock Avalanches ◽  
Beichuan County

<p>Large earthquake-triggered landslides, in particular rock avalanches, can have catastrophic consequences. However, the recognition of slopes prone to such failures remains difficult, because slope-specific seismic response depends on many factors including local topography, landforms, structure and internal geology. We address these issues by exploring the case of a rock avalanche of >3 million m<sup>3</sup> triggered by the 2008 Mw7.9 Wenchuan earthquake in the Longmen Shan range, China. The failure, denominated Yangjia gully rock avalanche, occurred in Beichuan County (Sichuan Province), one of the areas that suffered the highest shaking intensity and death toll caused by co-seismic landsliding. Even though the Wenchuan earthquake produced tens of large (volume >1 million m<sup>3</sup>) rock avalanches, few studies so far have examined the pre-2008 history of the failed slope or reported on the stratigraphic record of mass-movement deposits exposed along local river courses. The presented case of the Yangjia gully rock avalanche shows the importance of such attempts as they provide information on the recurrence of large slope failures and their associated hazards. Our effort stems from recognition, on 2005 satellite imagery, of topography and morphology indicative of a large, apparently pre-historic slope failure and the associated breached landslide dam, both features closely resembling the forms generated in the catastrophic 2008 earthquake. The follow-up reconstruction recognizes an earlier landslide deposit exhumed from beneath the 2008 Yangjia gully rock avalanche by fluvial erosion since May 2008. We infer a seismic trigger also for the pre-2008 rock avalanche based on the following circumstantial evidence: i) the same source area (valley-facing, terminal portion of a flat-topped, elongated mountain ridge) located within one and a half kilometer of the seismically active Beichuan fault; ii) significant directional amplification of ground vibration, sub-parallel to the failed slope direction, detected via ambient noise measurements on the ridge adjacent to the source area of the 2008 rock avalanche and iii) common depositional and textural features of the two landslide deposits. Then, we show how, through consideration of the broader geomorphic and seismo-tectonic contexts, one can gain insight into the spatial and temporal recurrence of catastrophic slope failures  in Beichuan County and elsewhere in the Longmen Shan. This insight, combined with local-scale geologic and geomorphologic knowledge, may guide selection of suspect slopes for reconnaissance, wide-area ambient noise investigation aimed at discriminating their relative susceptibility to co-seismic catastrophic failures. We indicate the feasibility of such investigations through the example of this study, which uses 3-component velocimeters designed to register low amplitude ground vibration.</p>

Analysis of anomalies in seismic ambient noise above fluid reservoirs

2021 ◽  
Author(s):  
Christine El Khoury
Keyword(s):  
Ambient Noise ◽  
Real Data ◽  
Gas Storage ◽  
Geological Structure ◽  
Geothermal Field ◽  
Hydrocarbon Reservoirs ◽  
Seismic Ambient Noise ◽  
Different Types ◽  
Exact Origin ◽  
Fluid Reservoir

<p>Anomalies in seismic ambient noise, defined as strong spectral amplification of the vertical components at frequencies of several Hertz, are currently observed on sites located above hydrocarbon reservoirs. If properly understood, these anomalies could have a potential for applications such as geothermal reservoir exploration or underground gas storage monitoring. Under purely elastic modeling, the nature of these anomalies was mainly explained by the geological structure more than the fluid reservoir itself.  The main objective of the present work is to explain the exact origin of the anomalies by numerical simulations of the 3D wave propagation using specfem3D code. The simulated spectral anomalies are essentially static and determined by the typical geological reservoir environments. The effect of an anticline structure, which is a common characteristic of hydrocarbon reservoirs, is investigated using different types of sources. Results show that the spectral anomalies caused by the presence of the anticline structure have similarities with the anomalies observed in real data. More work is needed to extract laws linking geometrical characteristics of the anticline to spectral properties. Future works will also include analysis on real gas storage sites, followed by a transposition to the geothermal field applications, for which more complicated parameters appear to participate to the phenomenon.</p>

Weathering front under a granite ridge revealed through full-3D seismic ambient-noise tomography

2019 ◽  
Vol 509 ◽  
pp. 66-77 ◽  
Author(s):  
Wei Wang ◽  
Po Chen ◽  
Ian Keifer ◽  
Ken Dueker ◽  
En-Jui Lee ◽  
...  
Keyword(s):  
Ambient Noise ◽  
3D Seismic ◽  
Ambient Noise Tomography ◽  
Seismic Ambient Noise

Estimation of the entropy of seismic ambient noise: Application to passive imaging

2017 ◽  
Vol 141 (5) ◽  
pp. 3526-3527
Author(s):  
Leonard Seydoux ◽  
Nikolai Shapiro ◽  
Julien de Rosny
Keyword(s):  
Ambient Noise ◽  
Passive Imaging ◽  
Seismic Ambient Noise
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