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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_ost - Ostatní články v recenzovaných periodicích

CEP obor

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OECD FORD obor

10508 - Physical geography

Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

Seismica

ISSN

2816-9387

e-ISSN

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Svazek periodika

3

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

CA - Kanada

Počet stran výsledku

11

Strana od-do

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Kód UT WoS článku

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EID výsledku v databázi Scopus

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