Non-double-couple earthquake mechanism as an artifact of the point-source approach applied to a finite-extent focus

0348504 - GFÚ 2011 RIV US eng J - Journal Article
Adamová, Petra - Šílený, Jan
Non-double-couple earthquake mechanism as an artifact of the point-source approach applied to a finite-extent focus.
Bulletin of the Seismological Society of America. Roč. 100, č. 2 (2010), s. 447-457. ISSN 0037-1106. E-ISSN 1943-3573
R&D Projects: GA ČR GA205/09/0724
Grant - others:GA MŠk(CZ) specifický-výzkum
Institutional research plan: CEZ:AV0Z30120515
Keywords : non-double-couple earthquake mechanism * moment tensor * finite-extent focus
Subject RIV: DC - Siesmology, Volcanology, Earth Structure
Impact factor: 2.027, year: 2010

A sizable amount of moderate and strong earthquakes exhibit a considerable percentage of non-double-couple (non-DC) components in the mechanism, as reported by agencies determining moment tensors on a routine basis from long-period seismograms. As most of them are tectonic events where a simple shear slip is anticipated along a roughly planar fault (at least in the optics of the long periods used), suspicion arises about their source origin. Leaving aside anisotropy in the source region, we assign them to be side effects of the application of the first degree moment tensor approximation to data still containing (after low-pass filtering) information about the source finiteness.
Permanent Link: http://hdl.handle.net/11104/0189029