Acoustic and Microseismic Characterization in Steep Bedrock Permafrost on Matterhorn (CH)

Understanding of processes and factors influencing slope stability is essential for assessing the stability of potentially hazardous slopes. Passive monitoring of acoustic emissions and microseismology provides subsurface information on fracturing (timing and identification of the mechanism) and therefore complement surface displacement data. This study investigates for the first time acoustic and microseismic signals generated in steep, fractured bedrock permafrost, covering the broad frequency range of 1 − 105 Hz. The analysis of artificial forcing experiments using a rebound hammer in a controlled setting led to two major findings: First, statistically insignificant cross correlation between signals indicates that waveforms change strongly with propagation distance. Second, a significant amplification is found in the frequency band 33–67 Hz. This finding is strongly supported by evidence from artificial rockfall events and more importantly by naturally occurring fracture events identified in fracture displacement data. Thus, filtering this frequency band enables enhanced detection of microseismic events relevant for slope stability assessment. The analysis of 2‐year time series in this frequency band further suggests that the detected energy rate baseline of all automatically triggered events using the STA/LTA algorithm is not sensitive to temperature forcing, an observation of primary importance for long‐term data collection, analysis, and interpretation. The event detection in the established frequency band is not only improved but also not affected by the short‐ and long‐term temperature changes in such a rapidly changing environment.

[1]  Philipp Mamot,et al.  A temperature- and stress-controlled failure criterion for ice-filled permafrost rock joints , 2018, The Cryosphere.

[2]  N. Hovius,et al.  Seismic monitoring of small alpine rockfalls – validity, precision and limitations , 2017 .

[3]  T. Hoffmann,et al.  Thermo‐cryogenic controls of fracture kinematics in permafrost rockwalls , 2017 .

[4]  Neil Dixon,et al.  Early detection of first-time slope failures using acoustic emission measurements: large-scale physical modelling , 2017 .

[5]  P. Watson,et al.  Monitoring rock freezing and thawing by novel geoelectrical and acoustic techniques , 2016 .

[6]  Evgeny A. Podolskiy,et al.  Cryoseismology , 2016 .

[7]  A. Vieli,et al.  Quantifying irreversible movement in steep, fractured bedrock permafrost on Matterhorn (CH) , 2016 .

[8]  D. Or,et al.  Codetection of acoustic emissions during failure of heterogeneous media: New perspectives for natural hazard early warning , 2015, 1509.06949.

[9]  Neil Dixon,et al.  Stability monitoring of a rail slope using acoustic emission , 2015 .

[10]  Lion Krischer,et al.  ObsPy: a bridge for seismology into the scientific Python ecosystem , 2015 .

[11]  J Faillettaz,et al.  Failure criterion for materials with spatially correlated mechanical properties. , 2015, Physical review. E, Statistical, nonlinear, and soft matter physics.

[12]  Jürg Schweizer,et al.  Measuring and localizing acoustic emission events in snow prior to fracture , 2015 .

[13]  D. Or,et al.  Monitoring and prediction in early warning systems for rapid mass movements , 2014 .

[14]  J. Wasowski,et al.  What we can learn about slope response to earthquakes from ambient noise analysis: An overview , 2014 .

[15]  C. Scavia,et al.  Feasibility of Ice Segregation Location by Acoustic Emission Detection: A Laboratory Test in Gneiss , 2014 .

[16]  M. Lüthi,et al.  Sustained seismic tremors and icequakes detected in the ablation zone of the Greenland ice sheet , 2014 .

[17]  Benjamin Edwards,et al.  Empirical evidence of local seismic effects at sites with pronounced topography: a systematic approach , 2014 .

[18]  H. Christiansen,et al.  A field-based model of permafrost-controlled rockslide deformation in northern Norway , 2014 .

[19]  M. Krautblatter,et al.  Why permafrost rocks become unstable: a rock–ice‐mechanical model in time and space , 2013 .

[20]  Austin A. Holland,et al.  Earthquakes Triggered by Hydraulic Fracturing in South‐Central Oklahoma , 2013 .

[21]  S. Gruber,et al.  Environmental controls of frost cracking revealed through in situ acoustic emission measurements in steep bedrock , 2013 .

[22]  Lion Krischer,et al.  ObsPy: A Python Toolbox for Seismology and Seismological Observatories , 2013 .

[23]  Jan Beutel,et al.  A custom acoustic emission monitoring system for harsh environments: application to freezing-induced damage in alpine rock walls , 2012, Geoscientific Instrumentation, Methods and Data Systems.

[24]  M. Krautblatter,et al.  P-wave velocity changes in freezing hard low-porosity rocks: a laboratory-based time-average model , 2012 .

[25]  Stephan Gruber,et al.  Evidence of frost-cracking inferred from acoustic emissions in a high-alpine rock-wall , 2012 .

[26]  Marina Pirulli,et al.  Analysis of microseismic signals and temperature recordings for rock slope stability investigations in high mountain areas , 2012 .

[27]  John H. Bradford,et al.  Monitoring Glacier Surface Seismicity in Time and Space Using Rayleigh Waves , 2012 .

[28]  Sridhar Anandakrishnan,et al.  Seismic attenuation in glacial ice: A proxy for englacial temperature , 2012 .

[29]  Denis Cohen,et al.  Sources and characteristics of acoustic emissions from mechanically stressed geologic granular media — A review , 2012 .

[30]  Jan Beutel,et al.  Kinematics of steep bedrock permafrost , 2012 .

[31]  Michel Jaboyedoff,et al.  Ambient seismic noise monitoring of a clay landslide: Toward failure prediction , 2012 .

[32]  Simon Loew,et al.  Characterization of alpine rockslides using statistical analysis of seismic signals , 2011 .

[33]  Valentin Gischig,et al.  Thermomechanical forcing of deep rock slope deformation: 1. Conceptual study of a simplified slope , 2011 .

[34]  D. Fäh,et al.  Site Effects in Unstable Rock Slopes: Dynamic Behavior of the Randa Instability (Switzerland) , 2011 .

[35]  Andreas Hasler,et al.  Temperature variability and offset in steep alpine rock and ice faces , 2011 .

[36]  J. Schweizer,et al.  Seismic sensor array for monitoring an avalanche start zone: design, deployment and preliminary results , 2011, Journal of Glaciology.

[37]  L. Baillet,et al.  Dynamic response of the Chamousset rock column (Western Alps, France) , 2010 .

[38]  D. Sornette,et al.  Icequakes coupled with surface displacements for predicting glacier break-off , 2010, Journal of Glaciology.

[39]  M. Derron,et al.  Statistical analysis of seasonal displacements at the Nordnes rockslide, northern Norway , 2010 .

[40]  J. Got,et al.  Pre-failure behaviour of an unstable limestone cliff from displacement and seismic data , 2010 .

[41]  Peter Lehmann,et al.  Fiber bundle model for multiscale modeling of hydromechanical triggering of shallow landslides , 2009 .

[42]  Monica Papini,et al.  Towards rockfall forecasting through observing deformations and listening to microseismic emissions , 2009 .

[43]  L. Thiele,et al.  PermaDAQ: A scientific instrument for precision sensing and data recovery in environmental extremes , 2009, 2009 International Conference on Information Processing in Sensor Networks.

[44]  Marina Pirulli,et al.  Microseismic activity analysis for the study of the rupture mechanisms in unstable rock masses (Matterhorn, North-western Alps) , 2009 .

[45]  Bikas K. Chakrabarti,et al.  Failure processes in elastic fiber bundles , 2008, 0808.1375.

[46]  E. Eberhardt,et al.  Improving the interpretation of slope monitoring and early warning data through better understanding of complex deep-seated landslide failure mechanisms , 2008 .

[47]  J. Murton,et al.  Frost weathering: recent advances and future directions , 2008 .

[48]  D. Petley,et al.  Patterns of precursory rockfall prior to slope failure , 2007 .

[49]  Alan G. Green,et al.  Microseismic investigation of an unstable mountain slope in the Swiss Alps , 2007 .

[50]  S. Gruber,et al.  Permafrost in steep bedrock slopes and its temperature‐related destabilization following climate change , 2007 .

[51]  J. Murton,et al.  Bedrock Fracture by Ice Segregation in Cold Regions , 2006, Science.

[52]  Stefano Zapperi,et al.  Statistical models of fracture , 2006, cond-mat/0609650.

[53]  James L. Beck,et al.  Introduction , 2006, Comput. Aided Civ. Infrastructure Eng..

[54]  F. Ringdal,et al.  The detection of low magnitude seismic events using array-based waveform correlation , 2006 .

[55]  D. Amitrano,et al.  Seismic precursory patterns before a cliff collapse and critical point phenomena , 2005, 0709.2651.

[56]  A. Hansen,et al.  Crossover behavior in burst avalanches: signature of imminent failure. , 2005, Physical review letters.

[57]  Bengt J Allen,et al.  Statistics: Concepts and Applications for Science.ByDavid LeBlanc.Sudbury (Massachusetts): Jones and Bartlett Publishers. $89.95 (two‐volume set). xvii + 382 p; ill.; index. ISBN: 0–7637–4699–1. 2004.Workbook to AccompanyStatistics: Concepts and Applications for Science.ByDavid LeBlanc.Sudbury (Mass , 2004 .

[58]  David N. Petley,et al.  The evolution of slope failures: mechanisms of rupture propagation , 2004 .

[59]  H. Herrmann,et al.  Creep rupture has two universality classes , 2003 .

[60]  T. Szwedzicki,et al.  Rock mass behaviour prior to failure , 2003 .

[61]  H Reginald Hardy,et al.  Acoustic Emission/Microseismic Activity: Volume 1: Principles, Techniques and Geotechnical Applications , 2003 .

[62]  H. Herrmann,et al.  Fracture model with variable range of interaction. , 2001, Physical review. E, Statistical, nonlinear, and soft matter physics.

[63]  Christopher John Young,et al.  A comparison of select trigger algorithms for automated global seismic phase and event detection , 1998, Bulletin of the Seismological Society of America.

[64]  Nicholas Sitar,et al.  Topographic effects on the seismic response of steep slopes , 1997, Bulletin of the Seismological Society of America.

[65]  D. Lockner The role of acoustic emission in the study of rock fracture , 1993 .

[66]  C. Stubbs,et al.  Weathering by segregation ice growth in microcracks at sustained subzero temperatures: Verification from an experimental study using acoustic emissions , 1991 .

[67]  D. Lockner,et al.  Quasi-static fault growth and shear fracture energy in granite , 1991, Nature.

[68]  K. Mogi,et al.  Frequency characteristics of acoustic emission in rocks under uniaxial compression and its relation to the fracturing process to failure , 1982 .

[69]  J. C. Savage,et al.  Icequakes on the Athabasca Glacier , 1970 .

[70]  Christopher H. Scholz,et al.  Microfracturing and the inelastic deformation of rock in compression , 1968 .

[71]  Jeffrey R. Moore,et al.  Ambient vibration characterization and monitoring of a rock slope close to collapse , 2018 .

[72]  A. Vieli,et al.  Rock-Temperature, Fracture Displacement And Acoustic/Micro-Seismic Data Measured At Matterhorn Hörnligrat, Switzerland , 2018 .

[73]  D. Fäh,et al.  FROM AMBIENT VIBRATION ASSESSMENT OF POTENTIAL ROCK SLOPE INSTABILITIES TO EARTHQUAKE TRIGGERED ROCKSLIDES , 2016 .

[74]  Neil Dixon,et al.  Microseismicity and Acoustic Emission for Landslide Monitoring (North-East Italy) , 2015 .

[75]  Stephan Gruber,et al.  Design of a Measurement Assembly to Study In Situ Rock Damage Driven by Freezing , 2012 .

[76]  F. Amann,et al.  Earthquake-triggered rock slope failures : Damage and site effects , 2012 .

[77]  Martin Funk,et al.  Basal icequakes during changing subglacial water pressures beneath Gornergletscher, Switzerland , 2008, Journal of Glaciology.

[78]  N. Deichmann,et al.  Evidence of log-periodic oscillations and increasing icequake activity during the breaking-off of large ice masses , 2008 .

[79]  Jan Beutel,et al.  Wireless Sensor Networks in Permafrost Research – Concept, Requirements, Implementation and Challenges , 2008 .

[80]  D. Marsan,et al.  Microseismic activity within a serac zone in an alpine glacier (Glacier d’Argentière, Mont Blanc, France) , 2008, Journal of Glaciology.

[81]  J. Pleuger,et al.  Structural evolution of the contact between two Penninic nappes (Zermatt-Saas zone and Combin zone, Western Alps) and implications for the exhumation mechanism and palaeogeography , 2007 .

[82]  J. Murton PERIGLACIAL LANDFORMS, ROCK FORMS | Rock Weathering , 2007 .

[83]  Doug Stead,et al.  Numerical analysis of initiation and progressive failure in natural rock slopes—the 1991 Randa rockslide , 2004 .

[84]  N. Dixon,et al.  Acoustic emission monitoring of slope instability: development of an active waveguide system , 2003 .

[85]  E. Eberhardta,et al.  Numerical analysis of initiation and progressive failure in natural rock slopes—the 1991 Randa rockslide , 2003 .

[86]  Theodor H. Erismann,et al.  Dynamics of rockslides and rockfalls , 2001 .

[87]  Frank Scherbaum,et al.  Evidence for deep icequakes in an Alpine glacier , 2000, Annals of Glaciology.

[88]  G. Gudmundsson,et al.  Thermally induced temporal strain variations in rock walls observed at subzero temperatures , 1999 .

[89]  A. G. Evans Acoustic emission sources in brittle solids , 1978 .

[90]  M. B. Dobrin Introduction to Geophysical Prospecting , 1976 .