The H/V spectral ratio has emerged as a single station method within the seismic ambient noise analysis field by its capability to quickly estimate frequency of resonance at site and through inversion average profile information. Although it is easy compute from experimental data, counter theoretical part not obvious when building forward model which can help in reconstructing derived spectrum. This led simplified assumption that wavefield mainly composed Rayleigh waves often used without...

ABSTRACT Since 2009, 91 new strong-motion stations were built for the renewal of Swiss Strong Motion Network. Another nine will be installed until 2022. For each station, an extensive site characterization study is performed to model 1D seismic-velocity profile and, some sites, liquefaction potential. Geophysical (passive and active surface-wave methods) geotechnical cone penetration test (CPT) with additional pore-pressure measurement (CPTu) seismic CPT (SCPT) methods are used. Analyzing...

Abstract We examine the use of ambient noise cross‐correlation tomography for shallow site characterization using a modified two‐step approach. Initially, we extract Rayleigh wave traveltimes from correlation traces vertical component seismic recordings local network installed in Mygdonia basin, northern Greece. The obtained show significant spatial variability, as well distance and frequency dependence due to 3‐D structure area, dispersion, anelastic attenuation effects. traveltime data...

SUMMARY This study presents the shear wave velocity (VS) structures of sedimentary sequences and a section upper crustal layer in Fukushima forearc region Japan Trench subduction zone, which were obtained by analysing horizontal-to-vertical (H/V) spectral ratios ambient vibration records. The H/V curves derived using 31 d continuous seismic data from 3 broad-band 16 short-period ocean bottom seismometer (OBS) stations. Using data, 0.01 to 10 Hz derived, but below 0.1 frequencies unusually...

Tsunamis occur not only in marine settings but also lacustrine environments. Most of the tsunamis are caused by seismically- or aseismically-triggered mass movements. Therefore, an assessment stability subaqueous slopes is crucial for tsunami hazard a lake. We selected Lake Lucerne (Switzerland) as natural laboratory to perform in-depth geotechnical characterization its slopes. This lake experienced documented 1601 and 1687. Some still bear sediment volumes with potential tsunamigenic...

Advances in the field of seismic interferometry have provided a basic theoretical interpretation to full spectrum microtremor horizontal-to-vertical spectral ratio [H/V(f)]. The has been applied ambient noise data recorded both at surface and depth. new algorithm, based on diffuse wavefield assumption, used inversion schemes estimate wave velocity profiles that are useful input information for engineering exploration seismology earthquake hazard estimation characterize surficial sediments....

We compute seismic velocity profiles by a combined inversion of surface-wave phase-velocity dispersion curves together with the full spectrum microtremor horizontal-to-vertical (H/V) spectral ratio at two sediment-covered sites in Germany. The sediment deposits are approximately 100 m thick first test site and 400 second site. have used an extended physical model based on diffuse wavefield assumption for interpretation observed H/V ratio. extension includes depth (in boreholes). This...

SUMMARY Seismically triggered subaqueous mass movements in lakes may generate tsunamis that can cause significant damage on the shore. In this study, we assess seismic response and stability of slopes Swiss based recorded seismological data, historical geological information geotechnical surveys. We performed investigations at multiple locations Lake Lucerne using Ocean Bottom Seismometers (OBS). For these locations, derived ground-motion amplification functions from local regional...

SUMMARY Single-station and array ambient vibration techniques are widely used in onshore environments, particular to retrieve the subsurface structure shear-wave velocity profiles. We apply these offshore Lake Lucerne (Switzerland) using single-station Ocean Bottom Seismometer (OBS) data. This lake has experienced tsunamigenic subaquatic slope failures past still sediment-charged slopes that might fail presence of a seismic or aseismic trigger. The application traditional methods brings...

ABSTRACT The assessment of the local site amplification during an earthquake requires, among other input information, a reliable estimate shear-wave velocity profile, including contact with engineering and seismic bedrocks. We determine (VS) profiles at two Swiss strong-motion borehole-station sites Visp (Valais) Buochs (Nidwalden) by inversion microtremor horizontal-to-vertical spectral ratio [H/V(z,f)] curves measured surface different depths. These borehole stations were built to monitor...

The phase-velocity dispersion curve (DC) is an important characteristic of the propagation surface waves in sedimentary environments. Although procedure for DC estimation onshore environments using ambient vibration recordings well established, offshore Ocean Bottom Seismometers (OBS) array vibrations presents three additional challenges: (1) localization sensors, (2) orientation OBS horizontal components, and (3) clock error. Here, we address these challenges inherent preprocessing workflow...

Summary Seismic velocity profiles resulting from a combined inversion of surface waves phase dispersion curves together with the full spectrum microtremor H/V spectral ratio at sediment-covered site in Germany is presented. We use new physical model proposed by Sánchez-Sesma et al. (2011) for interpretation ratio. This approach, based on diffuse wavefield theory accounts energy contribution body and thus allows both S- P-wave profiles. The preliminary results indicate that approach using...

<p>Numerous studies indicate that tsunamis do not only occur in oceans but also lakes. Lake Tsunamis are mainly caused by sublacustrine and subaerial mass movements can be triggered seismic or aseismic processes (Schnellmann et al. 2002, Strasser 2007, Kremer at 2012, Hilbe Anselmetti 2015). Such have devastating effects on the surrounding population infrastructure.</p><p>To assess tsunami hazard movements, stability of lake slopes needs to examined....