Analysis of Rayleigh-Wave Particle Motion from Active Seismics

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985891%3A_____%2F17%3A00507353" target="_blank" >RIV/67985891:_____/17:00507353 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.crossref.org/iPage?doi=10.1785%2F0120160063" target="_blank" >https://www.crossref.org/iPage?doi=10.1785%2F0120160063</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1785/0120160063" target="_blank" >10.1785/0120160063</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Analysis of Rayleigh-Wave Particle Motion from Active Seismics

Popis výsledku v původním jazyce

Back-azimuth analysis is a classical method used in seismological studies for the determination of the direction (azimuth) of an otherwise-unknown seismic source. This is accomplished through the analysis of three-component (3C) data according to a procedure based on the evaluation of Rayleigh-wave polarity and is typically accomplished by assuming a retrograde motion. The same principles are here considered in the framework of the analyses performed while considering active data collected by a 3C geophone, thus enabling us to easily and unambiguously compute the Rayleigh-wave particle motion (RPM) frequency curve that describes the motion of Rayleigh waves as a function of the frequency. The analyses performed for three test sites characterized by different stratigraphic conditions show that, contrary to the common assumption, in the considered frequency range (about 2-40 Hz), prograde motion is actually quite common. Although for two of the three presented case studies we consider a single-offset acquisition, in order to evaluate the variations of the RPM frequency curve as a function of the offset, we also considered two multi-offset datasets (one synthetic and one from a field acquisition). Results seem to indicate that, although some dependency on the offset necessarily exists, the overall trend is a characteristic of the site. Potential applications of the described approach are discussed in particular with respect to seismic-hazard studies, as well as in the light of the exploitation of the RPM frequency curve for better constraining the subsurface model.

Název v anglickém jazyce

Analysis of Rayleigh-Wave Particle Motion from Active Seismics

Popis výsledku anglicky

Back-azimuth analysis is a classical method used in seismological studies for the determination of the direction (azimuth) of an otherwise-unknown seismic source. This is accomplished through the analysis of three-component (3C) data according to a procedure based on the evaluation of Rayleigh-wave polarity and is typically accomplished by assuming a retrograde motion. The same principles are here considered in the framework of the analyses performed while considering active data collected by a 3C geophone, thus enabling us to easily and unambiguously compute the Rayleigh-wave particle motion (RPM) frequency curve that describes the motion of Rayleigh waves as a function of the frequency. The analyses performed for three test sites characterized by different stratigraphic conditions show that, contrary to the common assumption, in the considered frequency range (about 2-40 Hz), prograde motion is actually quite common. Although for two of the three presented case studies we consider a single-offset acquisition, in order to evaluate the variations of the RPM frequency curve as a function of the offset, we also considered two multi-offset datasets (one synthetic and one from a field acquisition). Results seem to indicate that, although some dependency on the offset necessarily exists, the overall trend is a characteristic of the site. Potential applications of the described approach are discussed in particular with respect to seismic-hazard studies, as well as in the light of the exploitation of the RPM frequency curve for better constraining the subsurface model.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Bulletin of the Seismological Society of America

ISSN

0037-1106

e-ISSN

—

Svazek periodika

107

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

12

Strana od-do

51-62

Kód UT WoS článku

000394004900005

EID výsledku v databázi Scopus

2-s2.0-85012012719