Imaging dispersion curves of surface waves on multi‐channel record

Park, Choon Byong; Miller, Richard D.; Xia, Jianghai

doi:10.1190/1.1820161

Cited by 550 publications

(330 citation statements)

References 7 publications

Supporting

Mentioning

317

Contrasting

Unclassified

Order By: Relevance

“…Inverting surface waves for the S-wave velocity model fall into two categories: 1) the classical method of inverting dispersion curves (Evison et al, 1959;Park et al, 1998;Xia et al, 2004) for a 1D layered medium, and 2) waveform inversion (Groos et al, 2014;Solano et al, 2014;Dou and Ajo-Franklin, 2014) for 2D and 3D media. The classical method accurately inverts for a 1D S-wave velocity model, but becomes less accurate with increasing lateral heterogeneity in the subsurface velocity model.…”

Section: Introductionmentioning

confidence: 99%

Skeletonized wave equation of surface wave dispersion inversion

Schuster

2016

SEG Technical Program Expanded Abstracts 2016

View full text Add to dashboard Cite

SUMMARYWe present the theory for wave equation inversion of dispersion curves, where the misfit function is the sum of the squared differences between the wavenumbers along the predicted and observed dispersion curves. Similar to wave-equation traveltime inversion, the complicated surface-wave arrivals in traces are skeletonized as simpler data, namely the picked dispersion curves in the (k x , ω) domain. Solutions to the elastic wave equation and an iterative optimization method are then used to invert these curves for 2D or 3D velocity models. This procedure, denoted as wave equation dispersion inversion (WD), does not require the assumption of a layered model and is less prone to the cycle skipping problems of full waveform inversion (FWI). The synthetic and field data examples demonstrate that WD can accurately reconstruct the S-wave velocity distribution in laterally heterogeneous media.

show abstract

Section: Introductionmentioning

confidence: 99%

Skeletonized wave equation of surface wave dispersion inversion

Schuster

2016

SEG Technical Program Expanded Abstracts 2016

View full text Add to dashboard Cite

show abstract

“…Çok kanallı yüzey dalgasının veri toplama düzeneği (Data acquisition mechanism of the multichannel surface wave) [8].…”

Section: Yüzey Dalgalarının çOk Kanallı Analizi (Multi Channel Analysunclassified

İstanbul-Atakent bölgesi (batı kısmının) yeraltı yapısının araştırılması ve modellenmesi

Dağ

Keskinsezer

2017

SAÜ Fen Bilimleri Enstitüsü Dergisi

View full text Add to dashboard Cite

ÖZBu çalışmada, İstanbul-Atakent bölgesinde daha sonra yapılması planlanan mühendislik yapıları öncesi, zemin özellikleri ve yer hareketleri nedeniyle doğabilecek olan problemlere karşı alınması gereken tedbirler amacıyla yer altı yapılarının modellenme çalışması gerçekleştirilmiştir. Sondaj kuyularından elde edilen malzeme bilgileri ve litolojik kesit doğrultuları Ceylan Formasyonu, Danişmen Formasyonu ve Çekmece Formasyonu üzerindedir. Çalışmalarda jeofizik yöntemlerden çoklu elektrot yöntemi ile çok kanallı yüzey dalgası analizi (MASW) yöntemi uygulanmıştır ve elde edilen sonuçlar sondaj kesitleri ile karşılaştırılmıştır. Jeofizik yöntemlerden elde edilen özdirenç değişimleri, sismik ortamlar ve mevcut topografyada varlığı görülen derelerin izleri 2B ve 3B grafiklerde işaretlenmiştir. Tüm sonuçların uyum içerisinde olduğunun tespitinden sonra inceleme sahasının yeraltı modellemesi yapılmıştır. İstanbul-Atakent region (the western portion) the underground investıgation and modelling ABSTRACTIn study, the prior engineering structures planned to be done later in İstanbul-Atakent region, a modeling study of underground structures has been carried out for the purpose of to be taken against the problems that may arise due to soil properties and ground movements. Material information obtained from drilling wells and line sections are on the Ceylan Formation, Danişmen Formation and Çekmece Formation. Multiple electrode method from geophysical methods and Multi-channel surface wave analysis methods were used in the studies and obtained results were compared with the drilling sections. The resistivity changes obtained from geophysical methods, traces of seismic environments and existing skies of existing topography, it is marked in 2D and 3D graphics. Underground modeling of the examination area was made, after the determination that all the results are in accordance.

show abstract

“…3c. The literature provides examples of implementing such evaluations [26, [28][29][30][31][32]. Although the format of implementation varies in the literature, the aim of estimating the spectral content in time and space is common.…”

Section: Two-dimensional Discrete Fourier Transformmentioning

confidence: 99%

Lamb Wave Phase Velocity Imaging of Concrete Plates with 2D Arrays

Tofeldt

Rydén

2017

J Nondestruct Eval

View full text Add to dashboard Cite

In the nondestructive evaluation of concrete structures, ultrasonic techniques are considered to be more capable than lowfrequency techniques such as the impact-echo method. This is especially true with the recent development of ultrasonic transducers, synthetic apertures, and results in an image form, and because low-frequency techniques are usually limited in their evaluation to the frequency of one single resonant mode. With the aim of reducing this gap in capabilities, we present a 2D array and wide-frequency bandwidth technique for Lamb wave phase velocity imaging. The presentation involves a measurement on a newly cast concrete plate using a hammer and an accelerometer as an example. The key concept of the technique is the use of 2D arrays that record a full wave field response over a limited surface subdomain within the complete measurement domain. Through a discrete Fourier transform, a spectral estimate is obtained for the 2D array in the frequencyphase velocity domain. The variation of the phase velocity is then mapped using a stepwise movement of the 2D array within the complete measurement domain. With two different types of 2D arrays, the variation of the phase velocity for the A0 Lamb mode is mapped and displayed in a polar and image plot, and low variation is observed for both cases. This result verifies the expected condition of a homogenous material and plate thickness and, more importantly, highlights the potential of wide-frequency bandwidth techniques based on full wave field data.

show abstract

Imaging dispersion curves of surface waves on multi‐channel record

Cited by 550 publications

References 7 publications

Skeletonized wave equation of surface wave dispersion inversion

Skeletonized wave equation of surface wave dispersion inversion

İstanbul-Atakent bölgesi (batı kısmının) yeraltı yapısının araştırılması ve modellenmesi

Lamb Wave Phase Velocity Imaging of Concrete Plates with 2D Arrays

Contact Info

Product

Resources

About