Infrasound produced by debris flow: propagation and frequency content evolution

Kogelnig, Arnold; Hübl, Johannes; Suriñach, Emma; Vilajosana, Ignasi; McArdell, Brian W.

doi:10.1007/s11069-011-9741-8

Cited by 73 publications

(88 citation statements)

References 17 publications

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“…The event had a duration of 867 s (defi ned as time with fl ow depth > 30 cm), a peak discharge of 380 m 3 /s, and a total volume of 14.000 m 3 within this time. This event has been previously discussed in [14,15] and is only shortly summarized for the purpose of this article. The data were collected using an infrasound microphone, a geophone, and two ultrasonic gauges (with an inter-distance of 47.2 m).…”

Section: Lattenbach Torrent (Austria)mentioning

confidence: 95%

“…The infrasound sensor and the geophone were placed close to the channel near the upper ultrasonic gauge for better data comparison. Furthermore, Kogelnig et al [14] showed that this location is optimal for both infrasonic and seismic monitoring as there is minimal background noise. A Campbell Scientifi c CR1000 data-logger was used with a sampling rate of 100 Hz.…”

Section: Lattenbach Torrent (Austria)mentioning

confidence: 99%

“…A detailed description of the used signal analysis methods, such as time series analysis, running spectra, and total spectra is given by Kogelnig et al [14,15] and Kogelnig [16]. Figure 1 shows the infrasound and seismic data of one debris fl ow monitored at the Lattenbach test site on 01.09.2008.…”

Section: Lattenbach Torrent (Austria)mentioning

confidence: 99%

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A review on acoustic moni toring of debris flow

et al. 2013

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Debris fl ows and debris fl oods are processes that occur in high alpine regions with consequences on infrastructure and settlements. Recently, several studies have been conducted by the authors using a new approach to gather knowledge about debris fl ows using a combination of two acoustic sensors: seismic sensors and infrasound microphones. Both sensors have been individually used in a number of previous studies. But the potential combination of infrasonic and seismic sensors for monitoring natural hazards, which could take advantage of the benefi ts of both sensor technologies and the possibility of using this setup for early warning, has not been evaluated to date. As a consequence, in this study the most important characteristics of acoustic signals from debris fl ows monitored at different locations in the Austrian and Swiss Alps are summarized and possible interfering signals are presented. An approach of using this acoustic signal for early warning will be introduced and evaluated. In addition, the data will be compared with other measurements, such as fl ow depth, interpretation, verifi cation, and validation of the seismic and infrasonic data.

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Section: Lattenbach Torrent (Austria)mentioning

confidence: 95%

Section: Lattenbach Torrent (Austria)mentioning

confidence: 99%

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A review on acoustic moni toring of debris flow

et al. 2013

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“…Torrential processes, especially debris flows, generate seismic waves in the ground, originated by the collision between boulders or between boulders and the bedrock. These vibrations can be measured by several seismic and sonic devices such as geophones, seismographs or infrasounds (Itakura et al, 2005;Kogelnig et al, 2011a). Geophones are the most common seismic sensors used in debris-flow monitoring because of their robustness and low power consumption.…”

Section: Introductionmentioning

confidence: 99%

“…These features make them also very suitable not only for monitoring, but also for warning purposes. All over the world, several sites have been instrumented with geophones: Illgraben in Switzerland (Hürlimann et al, 2003), Lattenbach in Austria (Kogelnig et al, 2011a), Moscardo , Acquabona (Berti et al, 2000) or Gadria in Italy, Manival or Réal in France (Navratil et al, 2011), Mount St. Helens in USA (LaHusen, 2005b), Houyenshan (Chou et al, 2010), Fong-Ciou Creek or Ai-Yu-Zi Creek Fang et al, 2011) in Taiwan, and Jiangjia in China (Cui et al, 2005) are some examples.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the ground vibration generated by debris flows and other torrential processes at the Rebaixader monitoring site (Central Pyrenees, Spain)

Abancó

Hürlimann

Moya

2014

Nat. Hazards Earth Syst. Sci.

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Abstract. Monitoring of debris flows using ground vibration sensors has increased in the last two decades. However, the correct interpretation of the signals still presents ambiguity. In the Rebaixader monitoring site (Central Pyrenees, Spain) two different ground vibration stations are installed. At the first station the ground velocity signal is transformed into an impulses-per-second signal (low frequency, 1 Hz). The analysis of the data recorded at this station show that the shape of the impulses signal is one of the key parameters to describe the evolution of the event. At the second station the ground velocity signal is directly recorded at high frequency (250 Hz). The results achieved at this station show that the differences in time series and spectral analysis are helpful to describe the temporal evolution of the events. In addition, some general outcomes were obtained: the attenuation of the signal with the distance has been identified as linear to exponential; and the assembly of the geophones to the terrain has an important effect on the amplification of the signal. All these results highlight that the definition of ground vibration thresholds for debris-flow detection or warning purposes is a difficult task; and that influence of site-specific conditions is notable.

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Lahar infrasound associated with Volcán Villarrica's 3 March 2015 eruption

Johnson

Palma

2015

Geophysical Research Letters

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The paroxysmal 2015 eruption of Volcán Villarrica (Chile) produced a 2.5 h long lahar, which descended more than 20 km within the Rio Correntoso/Turbio drainage and destroyed two small bridges. A three‐element infrasound array 10 km from the summit, and 4 km from the lahar's closest approach, was used to study the flow's progression. Array processing using cross‐correlation lag times and semblance places constraints on the lahar's dynamics, including detection of an initial flow pulse that traveled from 2 to 12 km at an average speed of 38 m/s. Subsequently, the lahar signal evolved to a relatively stationary infrasonic tremor located 10 to 12 km from the vent and adjacent to a topographic notch, through which sound may have preferentially diffracted toward the recording site. This study demonstrates the powerful capabilities of infrasound arrays for lahar study and suggests their potential application for future hazard monitoring.

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Infrasound produced by debris flow: propagation and frequency content evolution

Cited by 73 publications

References 17 publications

A review on acoustic moni toring of debris flow

A review on acoustic moni toring of debris flow

Analysis of the ground vibration generated by debris flows and other torrential processes at the Rebaixader monitoring site (Central Pyrenees, Spain)

Lahar infrasound associated with Volcán Villarrica's 3 March 2015 eruption

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