Elastic Full Waveform Tomography (FWT) aims to reduce the misfit between recorded and modelled data, deduce a very detailed model of elastic material parameters in underground. The choice be inverted affects convergence quality reconstructed subsurface model. Using Cross-Triangle-Squares (CTS) three parametrizations, Lamé m1 = [λ, μ, ρ], seismic velocities m2 [Vp, Vs, ρ] impedances m3 [Ip, Is, for far-offset reflection acquisition geometries with explosive point sources free-surface...

Abstract Mediterranean tectonics since the Lower Cretaceous has been characterized by a multiphase subduction and collision history with temporally spatially variable, small‐scale plate configurations. A new shear wave velocity model of upper mantle (MeRE2020), constrained very large set over 200,000 broadband (8–350 s), interstation, Rayleigh wave, phase curves, illuminates complex structure fragmentation subducting slabs. Phase maps computed using these measurements were inverted for...

ABSTRACT We develop a two‐dimensional full waveform inversion approach for the simultaneous determination of S‐wave velocity and density models from SH ‐ Love‐wave data. illustrate advantages SH/Love with simple synthetic example demonstrate method's applicability to near‐surface dataset, recorded in village Čachtice Northwestern Slovakia. Goal survey was map remains historical building foundations highly heterogeneous subsurface. The seismic comprises two parallel SH‐profiles maximum...

During the Quaternary, Rhine Glacier formed several overdeepened valleys, including Tannwald Basin (ICDP site 5068_1, Germany) about 45 km North of Lake Constance. These structures form sedimentary climate archives and thus help to understand dynamics in Alps.To obtain very high-resolution images sediment, seismic crosshole data was acquired using a high-frequency borehole source that predominantly generates SH-waves. The excited meter at 78 143 m depth, wavefield recorded depth 105 134 an...

Full waveform tomography (FWT) is a powerful velocity building method to exploit the full richness of seismic waveforms in complex media. Most applications today neglect frequency-dependent amplitude decrease and phase dispersion caused by intrinsic attenuation. In this study, we present numerical investigation influence attenuation on recovered model. Based generalized standard linear solid as rheological model, incorporate into 2-D time-domain acoustic FWT scheme. Attenuation considered...

ABSTRACT In addition to geophysical applications from the near surface a global scale, seismic full‐waveform inversion can be applied ultrasonic data on centimetre and decimetre scales for nondestructive testing of pavements, facades, plaster, sculptures, load‐bearing structures such as pillars or core samples boreholes, which consist geo‐materials non‐geomaterials. Classical non‐destructive approaches are based body‐wave travel times deduce P‐wave velocity models. contrast, waves...

Seismic full waveform inversion (FWI) has been applied to simple elastic problems with certain symmetries, such as isotropic, transverse isotropic or vertical transversely media. In this study, the FWI concept is extended most general anisotropic case 21 independent material parameters and no symmetry plane (triclinic). Beside a short description of 3-D finite-difference scheme solve forward problem optimization algorithm, we present sensitivity study for medium. This test consists...

The detection of cavities with geophysical methods is a challenging task for which general approach has not yet been found. We have found that viscoelastic SH full-waveform inversion (FWI), focusing primarily on reflection events, able to accurately locate the position cavities, areas decompacted sediments, and, more generally, seismic low-velocity anomalies down 30 m depth. key successful FWI application enhancement reflected wavefield relative surface wavefield. For this purpose, we apply...

ABSTRACT We apply seismic full waveform inversion to SH‐ and Love‐wave data for investigating the near‐surface lithology at an archaeological site. evaluate resolution of applied algorithm through ground truthing in form excavation sediment core studies. Thereby, we investigate benefits comparison with other established methods prospecting terms capabilities interpretation security. The study is performed a presumed harbour area ancient Thracian city Ainos. exemplary target source linear...

Full waveform inversion (FWI) is a data-fitting method that exploits the full information from seismic data to provide high-resolution models of subsurface. To reconstruct realistic field measurements forward modeling should correctly account for wave propagation phenomena present in recorded data. This mainly concerns correct amplitudes are sensitive not only velocity variations, but also density, attenuation, noise. The objective this study investigate role density reconstruction P-wave...

Renewable energy resources can indisputably minimize the threat of global warming and climate change. However, they are intermittent need buffer storage to bridge time-gap between production (off peak) demand peaks. Based on geologic geochemical reasons, North German Basin has a very large capacity for compressed air/gas CAES in porous saltwater aquifers salt cavities. Replacing pore reservoir brine with causes changes physical properties (elastic moduli, density electrical properties)...

Geothermal exploration relies in large parts on subsurface models derived from seismic reflection profiling. Based a case study of the Larderello area we discuss influence velocity uncertainties geothermal prospecting and highlight role unrecognized anisotropy. For field investigated anisotropy typical rock samples under simulated in-situ HP/HT conditions. It turns out that target horizons may be found up to 300 m shallower 200 horizontally displaced compared isotropic due anisotropic bias....

Summary We apply elastic time-domain 2D full waveform inversion (FWI) to a near surface SH-wave data set recorded in the town Cachtice northwestern Slowakia. Aim of seismic survey was detection possible basement structures. The data, consisting 48 shots and receivers distributed along 24 m long profile, covers wide frequency range from 5 Hz 260 with high signal-to-noise ratio well suited for FWI. In addition direct SH/Love-wave distinct refracted wave is visible. trend first arrivals...

In beach volleyball the setter has opportunity to give her or his hitter a "call". The call intends that suggests partner where place attack in opponent's court. effectiveness of is still unknown. We investigated women's and men's Swiss National Beach Volleyball Championships 2011 analyzed 2185 attacks. found large differences between female male players. While men called only 38.4% attacks, women used calls 85.5% If players followed given call, 63% attacks were successful. success rate...

With the increasing performance of parallel supercomputers full waveform tomography (FWT) approaches can reduce misfit between recorded and modelled data, to deduce a very detailed physical model underground. In recent years acoustic became popular tool image underground structures. However, inversion has disadvantage, that only P waves be inverted. It not invert for S-waves or surface waves. Here we will present first results our elastic time domain FWT code two synthetic examples discuss...

Summary The full waveform inversion (FWI) of strongly dispersive Love wave data is a challenging task. Amplitude, phase and dispersion information not only depends on the density shear modulus distribution in subsurface, but also significantly intrinsic damping. This especially problem near surface applications with complex underground structures low Qs values. Therefore, FWI wavefield demands an accurate initial visco-elastic model careful pre-processing. Another key ingredient successful...

Using surface seismic data for a full waveform tomography, only structures until certain penetration depth determined by maximum acquisition offset and overburden velocities can be resolved well. For typical acquisitions in the North Sea, this is often above reservoir level. Improving resolution of elastic parameters at level would help to more accurately interpret reservoir. On basis 2D synthetic it demonstrated that joint inversion OBC VSP enhance significantly depths below 2 km compared...

Summary In recent years the elastic full waveform inversion (FWI) was successfully applied to synthetic and field data compute high resolution velocity models. While seismic velocities are derived from recorded phase information, density models can be estimated amplitudes. However, due complexity of inverse problem a long wavelength initial model is required for good reconstruction density. The inclusion gravity into FWI concept solve this problem. study two-step hierarchic joint waveforms...