Microseismic events on the Åknes rockslide in Norway located by a back-projection approach

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F20%3A00512123" target="_blank" >RIV/67985530:_____/20:00512123 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11310/19:10406312

Výsledek na webu

<a href="https://link.springer.com/article/10.1007/s10950-019-09884-5" target="_blank" >https://link.springer.com/article/10.1007/s10950-019-09884-5</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10950-019-09884-5" target="_blank" >10.1007/s10950-019-09884-5</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Microseismic events on the Åknes rockslide in Norway located by a back-projection approach

Popis výsledku v původním jazyce

The Åknes rockslide in Western Norway is characterised by a steady movement of a rockmass with an extent of about 1 km2 and a yearly deformation rate in the range of 2 to 4 cm. A seismic network consisting of 8 three-component geophones records tens to hundreds of local and distant seismic events daily. Depending on their character, local seismic events show a variety of waveforms, both with abrupt and emergent onsets. Along with the relatively low frequencies of the waveforms, standard location procedure using arrival time measurements is difficult to apply. Based on the event envelopes, we classify local events and obtain their approximate location by stacking STA/LTA ratios of back-projected waveforms. To suppress the influence of complex surface morphology and related complicated wave propagation, we constrain hypocentres to the surface of the slope and determine only horizontal coordinates. The method was successfully tested by locating two typesofgroundtruth data:calibration shotsand a block collapse. The test proved the ability of the method to determine the position of sliding events with an uncertainty of less than 36 m, which allows to distinguish amongst several foci of rockslide activity. Application of the method to 8 years of monitoring data shows continuous seismic activity, which is concentrated in the centre and at the western edge of the monitored area. Most likely, microseismic events recorded by the seismic network originate within the body of the rock slope and are related to its disintegration or potentially to sliding on the detachment fault.n

Název v anglickém jazyce

Microseismic events on the Åknes rockslide in Norway located by a back-projection approach

Popis výsledku anglicky

The Åknes rockslide in Western Norway is characterised by a steady movement of a rockmass with an extent of about 1 km2 and a yearly deformation rate in the range of 2 to 4 cm. A seismic network consisting of 8 three-component geophones records tens to hundreds of local and distant seismic events daily. Depending on their character, local seismic events show a variety of waveforms, both with abrupt and emergent onsets. Along with the relatively low frequencies of the waveforms, standard location procedure using arrival time measurements is difficult to apply. Based on the event envelopes, we classify local events and obtain their approximate location by stacking STA/LTA ratios of back-projected waveforms. To suppress the influence of complex surface morphology and related complicated wave propagation, we constrain hypocentres to the surface of the slope and determine only horizontal coordinates. The method was successfully tested by locating two typesofgroundtruth data:calibration shotsand a block collapse. The test proved the ability of the method to determine the position of sliding events with an uncertainty of less than 36 m, which allows to distinguish amongst several foci of rockslide activity. Application of the method to 8 years of monitoring data shows continuous seismic activity, which is concentrated in the centre and at the western edge of the monitored area. Most likely, microseismic events recorded by the seismic network originate within the body of the rock slope and are related to its disintegration or potentially to sliding on the detachment fault.n

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

2020

Kód důvěrnosti údajů

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

Název periodika

Journal of Seismology

ISSN

1383-4649

e-ISSN

—

Svazek periodika

24

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

20

Strana od-do

55-74

Kód UT WoS článku

000492586800003

EID výsledku v databázi Scopus

2-s2.0-85075811743