Waveform inversion and focal mechanisms of two weak earthquakes in Cordillera Principal (Argentina) between 35 degrees and 35.5 degrees S

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F16%3A10330102" target="_blank" >RIV/00216208:11320/16:10330102 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.jsames.2015.12.001" target="_blank" >http://dx.doi.org/10.1016/j.jsames.2015.12.001</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jsames.2015.12.001" target="_blank" >10.1016/j.jsames.2015.12.001</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Waveform inversion and focal mechanisms of two weak earthquakes in Cordillera Principal (Argentina) between 35 degrees and 35.5 degrees S

Popis výsledku v původním jazyce

Only few (six) focal mechanism, in CMT Catalog, have been so far known for intraplate shallow events in the Andean chain close to Chile Argentina state border at latitudes similar to 35 degrees S. We add two more mechanisms, depths and moment magnitudes by carefully analyzing full waveforms of weak events recorded by broad-band stations of the Chile Argentina Geophysical Experiment (southern profile). The moment magnitudes of both events (Mw = 3.6 and 3.7) are lower than the duration magnitudes (Md = 4.0 and 4.29) reported by NEIC. The source depth, constrained by waveforms for one of the studied events (5.5-8.5 km) seems to be considerably shallower than the hypocenter depth located by means of arrival times (similar to 20 km). The waveform analysis was complemented by first-motion polarities which resulted in an uncertainty assessment of the focal mechanism. Event 1 (2001-11-03) has a strike-slip mechanism with a small normal component and almost vertical nodal planes in the north-south and east-west directions. The north-south nodal plane could be related to the Calabozos faults system. Event 2 (2002-02-16) has a strike-slip mechanism with a small thrust component. The latter event (its sub horizontal nodal plane) could be associated with the El Diablo-El Fierro fault system. Dextral strike-slip solutions are consistent with recent studies in the area.

Název v anglickém jazyce

Waveform inversion and focal mechanisms of two weak earthquakes in Cordillera Principal (Argentina) between 35 degrees and 35.5 degrees S

Popis výsledku anglicky

Only few (six) focal mechanism, in CMT Catalog, have been so far known for intraplate shallow events in the Andean chain close to Chile Argentina state border at latitudes similar to 35 degrees S. We add two more mechanisms, depths and moment magnitudes by carefully analyzing full waveforms of weak events recorded by broad-band stations of the Chile Argentina Geophysical Experiment (southern profile). The moment magnitudes of both events (Mw = 3.6 and 3.7) are lower than the duration magnitudes (Md = 4.0 and 4.29) reported by NEIC. The source depth, constrained by waveforms for one of the studied events (5.5-8.5 km) seems to be considerably shallower than the hypocenter depth located by means of arrival times (similar to 20 km). The waveform analysis was complemented by first-motion polarities which resulted in an uncertainty assessment of the focal mechanism. Event 1 (2001-11-03) has a strike-slip mechanism with a small normal component and almost vertical nodal planes in the north-south and east-west directions. The north-south nodal plane could be related to the Calabozos faults system. Event 2 (2002-02-16) has a strike-slip mechanism with a small thrust component. The latter event (its sub horizontal nodal plane) could be associated with the El Diablo-El Fierro fault system. Dextral strike-slip solutions are consistent with recent studies in the area.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

DC - Seismologie, vulkanologie a struktura Země

OECD FORD obor

—

Projekt

<a href="/cs/project/GA14-04372S" target="_blank" >GA14-04372S: Složitost zdrojů tektonických zemětřesení na různých časoprostorových škálách</a><br>

Návaznosti

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

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Journal of South American Earth Sciences

ISSN

0895-9811

e-ISSN

—

Svazek periodika

71

Číslo periodika v rámci svazku

-

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

11

Strana od-do

359-369

Kód UT WoS článku

000385322400027

EID výsledku v databázi Scopus

2-s2.0-84955581395