Seismic monitoring of an Alpine mountain river

Díaz, Jordi; Ruiz, Mario; Crescentini, Luca; Amoruso, Antonella; Muset, Josep Gallart

doi:10.1002/2014jb010955

Cited by 41 publications

(43 citation statements)

References 25 publications

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“…In the past decades, the potential of using acoustic and seismic signals for geomorphological gain has been explored in several studies (e.g. Bäzinger and Burch, 1990;Taniguchi et al, 1992;Govi et al, 1993;Rickenmann and McArdell, 2007;Burtin et al, 2008Burtin et al, , 2010Burtin et al, , 2011Gray et al, 2010;Hsu et al, 2011;Schmandt et al, 2013;Díaz et al, 2014;Roth et al, 2014;Chao et al, 2015;Barrière et al, 2015a). The approach makes use of the fact that the displacement of mass at the Earth's surface generates elastic seismic waves that propagate through the subsurface and can be recorded by acoustic or seismic sensors.…”

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confidence: 99%

Seismic monitoring of torrential and fluvial processes

2016

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Abstract. In seismology, the signal is usually analysed for earthquake data, but earthquakes represent less than 1 % of continuous recording. The remaining data are considered as seismic noise and were for a long time ignored. Over the past decades, the analysis of seismic noise has constantly increased in popularity, and this has led to the development of new approaches and applications in geophysics. The study of continuous seismic records is now open to other disciplines, like geomorphology. The motion of mass at the Earth's surface generates seismic waves that are recorded by nearby seismometers and can be used to monitor mass transfer throughout the landscape. Surface processes vary in nature, mechanism, magnitude, space and time, and this variability can be observed in the seismic signals. This contribution gives an overview of the development and current opportunities for the seismic monitoring of geomorphic processes. We first describe the common principles of seismic signal monitoring and introduce time-frequency analysis for the purpose of identification and differentiation of surface processes. Second, we present techniques to detect, locate and quantify geomorphic events. Third, we review the diverse layout of seismic arrays and highlight their advantages and limitations for specific processes, like slope or channel activity. Finally, we illustrate all these characteristics with the analysis of seismic data acquired in a small debris-flow catchment where geomorphic events show interactions and feedbacks. Further developments must aim to fully understand the richness of the continuous seismic signals, to better quantify the geomorphic activity and to improve the performance of warning systems. Seismic monitoring may ultimately allow the continuous survey of erosion and transfer of sediments in the landscape on the scales of external forcing.

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confidence: 99%

Seismic monitoring of torrential and fluvial processes

2016

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“…The Canfranc underground laboratory (LSC) is excavated in the rock under the Central Pyrenees Chain (Spain) (Figure ). Although it is mainly devoted to Particle Physics and Astrophysics, it also hosts a geodynamical facility [ Díaz et al ., ] capable of recording continuously the whole geodynamic spectrum, from near‐field seismicity to tectonic deformation, including Earth tides. The heart of the geodynamical facility are two laser strainmeters (interferometers), similar to those operating in Central Italy for about 20 years [ Crescentini et al ., ; Amoruso and Crescentini , ].…”

Section: Instrumental Set‐up and Strain Datamentioning

confidence: 99%

“…These latter produced valuable results on slow earthquakes [ Crescentini et al ., ; Amoruso and Crescentini , ], long‐period toroidal Earth free oscillations [ Park et al ., ], earthquake nucleation [ Amoruso and Crescentini , ], the free nutation of the Earth core [ Amoruso et al ., ], and the correlation between groundwater flow and deformation in a fractured carbonate aquifer [ Amoruso et al ., ]. For the moment, strain data from the LSC interferometers have been used to investigate the local link between groundwater flow and deformation [ Díaz et al ., ].…”

Section: Instrumental Set‐up and Strain Datamentioning

confidence: 99%

“…The laser strainmeters have been operating since end 2011, but, unfortunately, strain data acquisition suffered several interruptions, because of power outages during local severe storms, failures of the vacuum pumps and PCs, and laser tube replacements. We remove periods of heavy rain from the data set because of the related simultaneous large strain signals [ Díaz et al ., ]. The analyzed time intervals are shown in Figure a.…”

Section: Instrumental Set‐up and Strain Datamentioning

confidence: 99%

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Nonlinear and minor ocean tides in the Bay of Biscay from the strain tides observed by two geodetic laser strainmeters at Canfranc (Spain)

Amoruso

Crescentini

2016

JGR Oceans

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This work presents and discusses the tidal analysis of about 2.5 years of strain data recorded by two 70 m‐long high‐resolution laser strainmeters, which are operating in the Canfranc underground laboratory (Central Pyrenees, Spain). Spectra show clear tidal peaks whose frequencies range from the diurnal band to at least 8 cycles per day; strain amplitudes (relative change in length for each strainmeter) range from few 10−12 to 10−8. The reliability of observations and corrections for local distortions are testified by the excellent agreement between measurements and computations for all the diurnal and semidiurnal tides included in the TPXO8 and FES2012 tidal atlases, with the exception of L2. Observed higher‐frequency strain tides are mostly attributed to loading by nonlinear shallow‐water constituents in the Bay of Biscay, more than 120 km from the measurement site. The signals are quantitatively compared with computations using TPXO8 (MN4, M4, and MS4) and FES2012 (M3, N4, MN4, M4, MS4, and M6). Computations fully agree with M4 observations for one strainmeter, overestimate M4 by about 30% for the other strainmeter and M6 by about a factor of two, and underestimate the other tides. This work shows that data from high‐sensitivity strainmeters installed in high‐quality sites may provide valuable additional information for studying the nonlinear tidal dynamics and energetics of coastal waters and minor ocean tides, at spatial resolutions of tens to thousands square kilometers, depending on the strainmeter location with respect to the coastline.

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“…Hence it can reflect the effect of seismic events in stratum and some activities in the underground. One of the main tasks of the seismic positioning and monitoring system is to locate where the shock is [4][5][6]. Especially, the geophone array plays a key role in the system as it determines whether the system could work effectively.…”

Section: Introductionmentioning

confidence: 99%

Research on Geophone Array Method and Forward and Inversion Algorithm in Micro-seismic Positioning and Monitoring System

Zhang¹,

Yang²,

Wang³

et al. 2015

TOCIEJ

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Abstract:In order to make the seismic positioning and monitoring system work more effectively, this paper designs four kinds of geophone array methods. By establishing complex geological model and using micro-grid ray tracing, the process that the signal starts from the source location to the seismic geophone arrays is simulated in forward algorithm. In condition of random disturbance, the source location is retrieved by means of inversion algorithm fulfilled by neural network algorithm and genetic algorithm. Finally, on the basis of the analysis of the result and comparison with the true location, the characteristics of every geophone array method are presented. The paper also discusses proper number of geophones in the every array method. Results show that the most accurate, reasonable and effective array method can be selected and the forward and inversion algorithm is also effective.

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Seismic monitoring of an Alpine mountain river

Cited by 41 publications

References 25 publications

Seismic monitoring of torrential and fluvial processes

Seismic monitoring of torrential and fluvial processes

Nonlinear and minor ocean tides in the Bay of Biscay from the strain tides observed by two geodetic laser strainmeters at Canfranc (Spain)

Research on Geophone Array Method and Forward and Inversion Algorithm in Micro-seismic Positioning and Monitoring System

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