Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Variations in slab dip along the subducting Nazca Plate, as related to stress patterns and moment release of intermediate-depth seismicity and to surface volcanism
Autore:
Chen, PF; Bina, CR; Okal, EA;
Indirizzi:
Northwestern Univ, Dept Geol Sci, Evanston, IL 60208 USA Northwestern Univ Evanston IL USA 60208 Geol Sci, Evanston, IL 60208 USA
Titolo Testata:
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
, volume: 2, anno: 2001,
pagine: NIL_1 - NIL_20
SICI:
1525-2027(200112)2:<NIL_1:VISDAT>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
DEEP-FOCUS EARTHQUAKES; PHASE-TRANSITIONS; LITHOSPHERE;
Keywords:
subduction; seismicity; volcanism; stress; dip; Nazca; earthquake parameters; plate boundary -general; general or miscellaneous; South America;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Chen, PF Northwestern Univ, Dept Geol Sci, 1847 Sheridan Rd, Evanston, IL 60208 USA Northwestern Univ 1847 Sheridan Rd Evanston IL USA 60208 0208 USA
Citazione:
P.F. Chen et al., "Variations in slab dip along the subducting Nazca Plate, as related to stress patterns and moment release of intermediate-depth seismicity and to surface volcanism", GEOCH GEO G, 2, 2001, pp. NIL_1-NIL_20

Abstract

The subducting Nazca Plate shows a high degree of along-strike heterogeneity in terms of intermediate- depth seismicity (similar to 70- 300 km), orientations of slab stress, and volcanism. We compile the intermediate- depth earthquakes of South America from the Harvard Centroid Moment Tensor (CMT) catalogue to determine along- strike dip variations, and we explore the variable level of correlation between these observations. Primary results are three- fold: (1) Consistency among orientation of tension axes, highest level seismicity, and occurrence of volcanism is associated with steeply- dipping regions (20 degrees- 30 degrees). (2) Volcanism and intermediate- depthseismicity exhibit no direct correlation, suggesting that earthquake faulting is not a necessary condition for transport of dehydrated fluids out to the mantle wedge for initiation of melting. (3) Comparison of slab thermal structures between regions with and without volcanism suggests that for certain wedge widths, the maximum temperature in the mantle wedge is higher for the former than for the latter.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/04/20 alle ore 03:43:17