Disputable non-double-couple mechanisms of several strong earthquakes: second-degree moment approach

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F13%3A00396790" target="_blank" >RIV/67985530:_____/13:00396790 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1785/0120130014" target="_blank" >http://dx.doi.org/10.1785/0120130014</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1785/0120130014" target="_blank" >10.1785/0120130014</a>

Result language
angličtina
Original language name
Disputable non-double-couple mechanisms of several strong earthquakes: second-degree moment approach
Original language description
The earthquake source mechanism (description of the geometry of the source and its strength in terms of forces equivalent to rupturing of the rock mass) is routinely modeled as a moment tensor (MT) describing the earthquake focus as a point. However, sometimes this approximation is not satisfied, and seismic radiation keeps the directivity due to the finite extent of the source. Inversion into the MT then may yield a biased mechanism. Synthetic study in the Adamová and Šílený (2010) demonstrated the appearance of spurious non-double-couple components in the mechanism even for a pure double-couple (DC) source. Their method was designed to reduce the spurious source components by using the second-degree moments to evaluate their contribution into the records and subtract it from the data. Here we applied the procedure to five moderate to large regional events with large nonshear components. They are mostly located on large tectonic faults where predominantly pure shear slip is expected.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
DC - Seismology, volcanology and Earth structure
OECD FORD branch
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Project
<a href="/en/project/GAP210%2F10%2F0296" target="_blank" >GAP210/10/0296: Earthquake source modelling by second degree moment tensors</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2013
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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