MASW? A critical perspective on problems and opportunities in surface-wave analysis from active and passive data (with few legal considerations)

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985891%3A_____%2F23%3A00571768" target="_blank" >RIV/67985891:_____/23:00571768 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.pce.2023.103369" target="_blank" >https://doi.org/10.1016/j.pce.2023.103369</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.pce.2023.103369" target="_blank" >10.1016/j.pce.2023.103369</a>

Jazyk výsledku

angličtina

Název v původním jazyce

MASW? A critical perspective on problems and opportunities in surface-wave analysis from active and passive data (with few legal considerations)

Popis výsledku v původním jazyce

In the last two decades, surface wave analysis has become a widespread practice for several geotechnical ap-plications and the MASW (Multichannel Analysis of Surface Waves) acronym has become extremely popular. The standard MASW approach is based on the personal (i.e. subjective) interpretation of the phase-velocity spectrum of the vertical component of Rayleigh waves. This way, we do not invert the actual datum but a subjective interpretation that can be wrong and lead to erroneous shear-wave velocity (VS) profiles. Even in case data interpretation is correct, non-uniqueness of the solution obtained from inversion of just one observable remains a problem. A series of active and passive synthetic and field datasets are used to illustrate main issues in surface wave analysis and highlight the need for multi-component analysis possibly according to an approach that goes beyond the subjective interpretation of modal dispersion curves. The multi-component approach considered to overcome the ambiguities of single-component analysis is performed according to the FVS (Full Velocity Spec-trum) approach, therefore overcoming subjective velocity-spectra interpretations. It is also shown that surfacewave analysis can be effectively carried out considering not phase velocities but group velocities, with the obvious benefit that while for the phase-velocity analysis multi-offset data are necessary, the definition of the group velocities can be accomplished from single-offset data (i.e. from the data of one single sensor). An example of erroneous VS determination made for an important public building is illustrated in order to highlight the importance of multi-component analysis and the need for stricter guidelines.

Název v anglickém jazyce

MASW? A critical perspective on problems and opportunities in surface-wave analysis from active and passive data (with few legal considerations)

Popis výsledku anglicky

In the last two decades, surface wave analysis has become a widespread practice for several geotechnical ap-plications and the MASW (Multichannel Analysis of Surface Waves) acronym has become extremely popular. The standard MASW approach is based on the personal (i.e. subjective) interpretation of the phase-velocity spectrum of the vertical component of Rayleigh waves. This way, we do not invert the actual datum but a subjective interpretation that can be wrong and lead to erroneous shear-wave velocity (VS) profiles. Even in case data interpretation is correct, non-uniqueness of the solution obtained from inversion of just one observable remains a problem. A series of active and passive synthetic and field datasets are used to illustrate main issues in surface wave analysis and highlight the need for multi-component analysis possibly according to an approach that goes beyond the subjective interpretation of modal dispersion curves. The multi-component approach considered to overcome the ambiguities of single-component analysis is performed according to the FVS (Full Velocity Spec-trum) approach, therefore overcoming subjective velocity-spectra interpretations. It is also shown that surfacewave analysis can be effectively carried out considering not phase velocities but group velocities, with the obvious benefit that while for the phase-velocity analysis multi-offset data are necessary, the definition of the group velocities can be accomplished from single-offset data (i.e. from the data of one single sensor). An example of erroneous VS determination made for an important public building is illustrated in order to highlight the importance of multi-component analysis and the need for stricter guidelines.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10507 - Volcanology

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physics and Chemistry of the Earth

ISSN

1474-7065

e-ISSN

1873-5193

Svazek periodika

130

Číslo periodika v rámci svazku

JUN 2023

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

18

Strana od-do

103369

Kód UT WoS článku

000943151100001

EID výsledku v databázi Scopus

2-s2.0-85147844655