Acoustic emission events interpreted in terms of source directivity

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F20%3A00525378" target="_blank" >RIV/67985530:_____/20:00525378 - isvavai.cz</a>

Alternative codes found

RIV/67985831:_____/20:00525378

Result on the web

<a href="https://link.springer.com/article/10.1007/s00024-020-02517-w" target="_blank" >https://link.springer.com/article/10.1007/s00024-020-02517-w</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s00024-020-02517-w" target="_blank" >10.1007/s00024-020-02517-w</a>

Result language

angličtina

Original language name

Acoustic emission events interpreted in terms of source directivity

Original language description

During inversion for the source mechanisms of laboratory acoustic emission events, relatively high misfit values (expressed as the RMS of the inverted equations) were observed. Our experiment was performed on Westerly Granite. A processed set of data consisting of 2405 acoustic emission events was used and a semi-homogeneous velocity model was considered. A correction for sensor radiation patterns and individual sensor constants was taken into account, and an acausal attenuation model was assumed. Source mechanisms were inverted for the moment tensor. The application of a more sophisticated medium model improved inversion quality only for some events. Introducing the source directivity, a standard approach for earthquakes with magnitudes larger than approximately 4, increased the number of successfully inverted events. Directivity was introduced using a Haskell source model. Optionally unilateral and bilateral versions of the source were considered. Lower values of RMS for the Haskell source model were considered to justify the directivity approach. This formalism enables us to select the preferable fault from the two nodal planes within the fault plane solution. The rupture directions were observed to tend to the dip direction of the preferred fault. They were found to be preferably subparallel to slip directions for acoustic emissions with a significant DC component. The source time functions retrieved from the seismograms are in agreement with finite source theory.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20701 - Environmental and geological engineering, geotechnics

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2020

Confidentiality

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

Name of the periodical

Pure and Applied Geophysics

ISSN

0033-4553

e-ISSN

—

Volume of the periodical

177

Issue of the periodical within the volume

9

Country of publishing house

CH - SWITZERLAND

Number of pages

18

Pages from-to

4271-4288

UT code for WoS article

000538949500001

EID of the result in the Scopus database

2-s2.0-85086148175