Apparent Non-Double-Couple Components as Artifacts of Moment Tensor Inversion

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985891%3A_____%2F24%3A00586738" target="_blank" >RIV/67985891:_____/24:00586738 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.26443/seismica.v3i1.1157" target="_blank" >https://doi.org/10.26443/seismica.v3i1.1157</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.26443/seismica.v3i1.1157" target="_blank" >10.26443/seismica.v3i1.1157</a>

Result language

angličtina

Original language name

Apparent Non-Double-Couple Components as Artifacts of Moment Tensor Inversion

Original language description

Compilations of earthquake moment tensors from global and regional catalogs find pervasive non-double-couple (NDC) componentsnwith a mean deviation from a double-couple (DC) source of around 20%. Their distributions vary only slightly with magnitude, faulting mechanism, or geologic environments. This consistency suggests thatfor most earthquakes, especially smaller ones whose rupture processes are expected to be simpler, the NDC components are largely artifacts of the moment tensor inversion procedure. This possibility is also supported by the fact that NDC components for individual earthquakes with Mw<6.5 are only weakly correlated betweenncatalogs. We explore this possibility by generating synthetic seismograms for the double-couple components of earthquakes around thenworld using one Earth model and inverting them with a different Earth model. To match the waveforms with a different Earth model, the inversion changes the mechanisms to include a substantial NDC component while largely preserving the fault geometry (DC component). The resulting NDC components have a size and distribution similar to those reported for the earthquakes in the Global Centroid Moment Tensor (GCMT) catalog. The fact that numerical experiments replicate general features of the pervasive NDC components reported in moment tensor catalogs implies that these components are largely artifacts of the inversions not adequately accounting for the effects of laterally varying Earth structure.

Czech name

—

Czech description

—

Type

J_ost - Miscellaneous article in a specialist periodical

CEP classification

—

OECD FORD branch

10508 - Physical geography

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

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

Name of the periodical

Seismica

ISSN

2816-9387

e-ISSN

—

Volume of the periodical

3

Issue of the periodical within the volume

1

Country of publishing house

CA - CANADA

Number of pages

11

Pages from-to

—

UT code for WoS article

—

EID of the result in the Scopus database

—