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Titolo:
Strain accumulation and rotation in the Eastern California Shear Zone
Autore:
Savage, JC; Gan, WJ; Svarc, JL;
Indirizzi:
US Geol Survey, Menlo Pk, CA 94025 USA US Geol Survey Menlo Pk CA USA 94025 Geol Survey, Menlo Pk, CA 94025 USA
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
fascicolo: B10, volume: 106, anno: 2001,
pagine: 21995 - 22007
SICI:
0148-0227(20011010)106:B10<21995:SAARIT>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
MOJAVE-DESERT; SOUTHERN-CALIFORNIA; CRUSTAL RHEOLOGY; GARLOCK FAULT; PLATE MOTION; OWENS-VALLEY; SLIP RATE; MODEL; DRIVEN; FLOW;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Savage, JC US Geol Survey, M-S977,345 Middlefield Rd, Menlo Pk, CA 94025 USA US Geol Survey M-S977,345 Middlefield Rd Menlo Pk CA USA 94025
Citazione:
J.C. Savage et al., "Strain accumulation and rotation in the Eastern California Shear Zone", J GEO R-SOL, 106(B10), 2001, pp. 21995-22007

Abstract

Although the Eastern California Shear Zone (ECSZ) (strike similar to N25 degreesW) does not quite coincide with a small circle drawn about the Pacific-North America pole of rotation, trilateration and GPS measurements demonstrate that the motion within the zone corresponds to right-lateral simple shear across a vertical plane (strike N33 degreesW +/-5 degrees) roughly parallel to the tangent to that local small circle (strike similar to N40 degreesW). If the simple shear is released by slip on faults subparallel to theshear zone, the accumulated rotation is also released, leaving no secular rotation. South of the Garlock fault the principal faults (e.g., Calico-Blackwater fault) strike similar to N40 degreesW, close enough to the strike of the vertical plane across which maximum right-lateral shear accumulates to almost wholly accommodate that accumulation of both strain and rotation by right-lateral slip. North of the Garlock fault dip slip as well as strikeslip on the principal faults (strike similar to N20 degreesW) is required to accommodate the simple shear accumulation. In both cases the accumulatedrotation is released with the shear strain. The Garlock fault, which transects the ECSZ, is not offset by north-northwest striking faults nor, despite geological evidence for long-term left-lateral slip, does it appear at the present time to be accumulating left-lateral simple shear strain across the fault due to slip at depth. Rather the motion is explained by right-lateral simple shear across the orthogonal ECSZ. Left-lateral slip on the Garlock fault will release the shear strain accumulating there but would augmentthe accumulating, rotation, resulting in a secular clockwise rotation ratesimilar to 80 nrad yr(-1) (4.6 degrees Myr(-1)).

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/01/20 alle ore 11:48:13