ISOLA2024: Assessing and Understanding Uncertainties of Full Moment Tensors

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10508372" target="_blank" >RIV/00216208:11320/25:10508372 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=9.WH-TWcXi" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=9.WH-TWcXi</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1785/0220240420" target="_blank" >10.1785/0220240420</a>

Jazyk výsledku

angličtina

Název v původním jazyce

ISOLA2024: Assessing and Understanding Uncertainties of Full Moment Tensors

Popis výsledku v původním jazyce

ISOLA is a software package designed to calculate centroid moment tensors (MTs) by waveform inversion for single- and multiple-point-source models. Calculations are running with Fortran codes under Matlab Graphic User Interface. The codes have been continuously developed and widely used for over 20 yr. ISOLA2024 is the latest version upgraded in the assessment of MT uncertainties, important mainly for non-double-couple (non-DC) MT components. Data error is assumed to be represented by residual waveforms. The uncertainties are evaluated with existing methods using four types of covariance matrices (CMs). The code produces simple statistics of non-DC components, including their variations over grid-searched source positions. Hudson&apos;s plots of MT scatter enable the classification of the source type. The CM methods are explained with four earthquake data sets. We show that CMs may assist in choosing a low-noise frequency range for inversion and suppress correlated data errors; thus, they improve the MT estimate, yet do not increase waveform fit. Error bounds of the non-DC percentages strongly vary across the example events (up to similar to 20%) and slightly change with the used CM type. In certain applications, as a joint effect of the source position, station configuration, frequency range, and velocity model, MT uncertainty can be so large that tions, the non-DC components can be resolved very well, within similar to 5%. In contrast to automated MT inversions, ISOLA2024 is suitable for applications involving repeated inversions of an earthquake, with varied parameters, and offers insight into the processing steps. It is also a test bed for new CM methods before their automation and can serve as an educational tool.

Název v anglickém jazyce

ISOLA2024: Assessing and Understanding Uncertainties of Full Moment Tensors

Popis výsledku anglicky

ISOLA is a software package designed to calculate centroid moment tensors (MTs) by waveform inversion for single- and multiple-point-source models. Calculations are running with Fortran codes under Matlab Graphic User Interface. The codes have been continuously developed and widely used for over 20 yr. ISOLA2024 is the latest version upgraded in the assessment of MT uncertainties, important mainly for non-double-couple (non-DC) MT components. Data error is assumed to be represented by residual waveforms. The uncertainties are evaluated with existing methods using four types of covariance matrices (CMs). The code produces simple statistics of non-DC components, including their variations over grid-searched source positions. Hudson&apos;s plots of MT scatter enable the classification of the source type. The CM methods are explained with four earthquake data sets. We show that CMs may assist in choosing a low-noise frequency range for inversion and suppress correlated data errors; thus, they improve the MT estimate, yet do not increase waveform fit. Error bounds of the non-DC percentages strongly vary across the example events (up to similar to 20%) and slightly change with the used CM type. In certain applications, as a joint effect of the source position, station configuration, frequency range, and velocity model, MT uncertainty can be so large that tions, the non-DC components can be resolved very well, within similar to 5%. In contrast to automated MT inversions, ISOLA2024 is suitable for applications involving repeated inversions of an earthquake, with varied parameters, and offers insight into the processing steps. It is also a test bed for new CM methods before their automation and can serve as an educational tool.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10500 - Earth and related environmental sciences

Projekt

<a href="/cs/project/GA23-06345S" target="_blank" >GA23-06345S: Seismo-geodynamické modelování Helénské subdukce</a><br>

Návaznosti

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

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Seismological Research Letters

ISSN

0895-0695

e-ISSN

1938-2057

Svazek periodika

96

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

13

Strana od-do

2647-2659

Kód UT WoS článku

001533699100043

EID výsledku v databázi Scopus

2-s2.0-105009954620