Acoustic emission in a laboratory: mechanism of microearthquakes using alternative source models

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F18%3A00493426" target="_blank" >RIV/67985530:_____/18:00493426 - isvavai.cz</a>

Alternative codes found

RIV/67985831:_____/18:00493426

Result on the web

<a href="http://dx.doi.org/10.1029/2017JB015393" target="_blank" >http://dx.doi.org/10.1029/2017JB015393</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1029/2017JB015393" target="_blank" >10.1029/2017JB015393</a>

Result language

angličtina

Original language name

Acoustic emission in a laboratory: mechanism of microearthquakes using alternative source models

Original language description

Here a shear-tensile crack (STC) model is presented as suitable for acoustic emission (AE) events. Experimental data were obtained from a uniaxial compression test performed on a Westerly Granite specimen using a 14-channel AE monitoring system. The advantages of the STC versus a traditional MT (moment tensor) approach are as follows: (i) it is a physical source, contrary to the MT, since the STC describes the straight and simple fracture modes anticipated inside a loaded sample, namely, the shear slip and both the opening and closing tensile cracks, and (ii) it is simpler because it is described by fewer parameters (five instead of the six required for an unconstrained MT), which is essential for solving the inverse problem. The presented STC procedure was tested on 38 AE events selected over a range of 50-98% for the uniaxial compressive strength. As compared to the MT model, the STC model displayed a similar fit for input data while providing far smaller confidence regions. The results indicate a more certain determination for the mechanism of orientation and improved reliability for the decomposition components. In addition, use of STC model allowed better distinction between tension and shear type for AE events, which may be crucial for recognizing an approaching failure. For our experiment, application of the STC model proved to be useful for recognizing the threshold of unstable microcracking and indicative for determining the failure plain orientation.

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

10507 - Volcanology

Project

<a href="/en/project/GA16-03950S" target="_blank" >GA16-03950S: Solid body fracturing mode by shear-tensile source model: acoustic emission laboratory study</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

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

Name of the periodical

Journal of Geophysical Research: Solid Earth

ISSN

2169-9313

e-ISSN

—

Volume of the periodical

123

Issue of the periodical within the volume

6

Country of publishing house

US - UNITED STATES

Number of pages

18

Pages from-to

4965-4982

UT code for WoS article

000439933200027

EID of the result in the Scopus database

2-s2.0-85050076217