Stress and faulting pattern in the Bam Region, SE Iran, detected by fault instability criterion and fry method

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F24%3A00583509" target="_blank" >RIV/67985530:_____/24:00583509 - isvavai.cz</a>

Výsledek na webu

<a href="https://link.springer.com/article/10.1007/s00024-023-03398-5" target="_blank" >https://link.springer.com/article/10.1007/s00024-023-03398-5</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s00024-023-03398-5" target="_blank" >10.1007/s00024-023-03398-5</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Stress and faulting pattern in the Bam Region, SE Iran, detected by fault instability criterion and fry method

Popis výsledku v původním jazyce

In this study, we determine the stress release from the 2003 Bam earthquake (Mw 6.6) by applying the stress inversion technique to focal mechanisms of 199 aftershocks. There is no evidence of significant surface faulting that can be used to study the faulting pattern of the Bam fault zone. Therefore, we applied two independent methods for identifying the faulting pattern in this zone: the instability criterion based on the analysis of orientations of nodal planes of focal mechanisms with respect to the regional stress, and the Fry method based on the analysis of spatial clustering of aftershock foci. The results show that the fault associated with the 2003 Bam earthquake is well oriented for shearing under the present-day regional stress. We identified four sets of faults with a close angular relation to the maximum horizontal compression (SHmax) that have been (re)activated. These faults include strike-slip (right lateral and left lateral), thrust, and normal faults that are oriented approximately oblique, perpendicular, and parallel relative to the SHmax, respectively. The direction of the SHmax is N31 degrees E. Based on the results, we propose to apply the instability criterion and the Fry method to seismic data as two valuable and independent techniques in order to constrain the kinematic and active faulting in the area.

Název v anglickém jazyce

Stress and faulting pattern in the Bam Region, SE Iran, detected by fault instability criterion and fry method

Popis výsledku anglicky

In this study, we determine the stress release from the 2003 Bam earthquake (Mw 6.6) by applying the stress inversion technique to focal mechanisms of 199 aftershocks. There is no evidence of significant surface faulting that can be used to study the faulting pattern of the Bam fault zone. Therefore, we applied two independent methods for identifying the faulting pattern in this zone: the instability criterion based on the analysis of orientations of nodal planes of focal mechanisms with respect to the regional stress, and the Fry method based on the analysis of spatial clustering of aftershock foci. The results show that the fault associated with the 2003 Bam earthquake is well oriented for shearing under the present-day regional stress. We identified four sets of faults with a close angular relation to the maximum horizontal compression (SHmax) that have been (re)activated. These faults include strike-slip (right lateral and left lateral), thrust, and normal faults that are oriented approximately oblique, perpendicular, and parallel relative to the SHmax, respectively. The direction of the SHmax is N31 degrees E. Based on the results, we propose to apply the instability criterion and the Fry method to seismic data as two valuable and independent techniques in order to constrain the kinematic and active faulting in the area.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10507 - Volcanology

Projekt

<a href="/cs/project/GA22-10747S" target="_blank" >GA22-10747S: Výpočet napětí a jeho časoprostorového rozložení z ohniskových mechanismů a seismických momentových tenzorů</a><br>

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

Pure and Applied Geophysics

ISSN

0033-4553

e-ISSN

1420-9136

Svazek periodika

181

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

13

Strana od-do

219-231

Kód UT WoS článku

001132382700002

EID výsledku v databázi Scopus

2-s2.0-85180834219