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Titolo:
Seismic wave observations with the Global Positioning System
Autore:
Nikolaidis, RM; Bock, Y; de Jonge, PJ; Shearer, P; Agnew, DC; Van Domselaar, M;
Indirizzi:
Scripps Inst Oceanog, Cecil H & Ida M Green Inst Geophys & Planetary Ph, La Jolla, CA 92093 USA Scripps Inst Oceanog La Jolla CA USA 92093 ary Ph, La Jolla, CA 92093 USA
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
fascicolo: B10, volume: 106, anno: 2001,
pagine: 21897 - 21916
SICI:
0148-0227(20011010)106:B10<21897:SWOWTG>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
LANDERS EARTHQUAKE SEQUENCE; STRONG GROUND MOTION; 1971 SAN-FERNANDO; LOS-ANGELES BASIN; CALIFORNIA; DISPLACEMENTS; DEFORMATION; ARRAY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
41
Recensione:
Indirizzi per estratti:
Indirizzo: Nikolaidis, RM Scripps Inst Oceanog, Cecil H & Ida M Green Inst Geophys & Planetary Ph, La Jolla, CA 92093 USA Scripps Inst Oceanog La Jolla CA USA 92093 a, CA 92093 USA
Citazione:
R.M. Nikolaidis et al., "Seismic wave observations with the Global Positioning System", J GEO R-SOL, 106(B10), 2001, pp. 21897-21916

Abstract

We describe the direct measurement of ground displacement caused by the Hector Mine earthquake in southern California (M-w 7.1, October 16, 1999). Weuse a new method of instantaneous positioning, which estimates site coordinates from only a single epoch of Global Positioning System (GPS) data, to measure dynamic as well as static displacements at 24 stations of the Southern California Integrated GPS Network (SCIGN), with epicentral distances from 50 to 200 km. For sites outside the Los Angeles basin the observed displacements are well predicted by an elastic half-space model with a point shear dislocation; within the sedimentary basin we observe large displacementswith amplitudes up to several centimeters that last as long as 3-4 min. Since we resolve the GPS phase ambiguities and determine site coordinates independently at each epoch, the GPS solution rate is the same as the receiversampling rate. For the SCIGN data this is 0.033 Hz (once per 30 s), thoughsample rates up to 2 Hz are possible with the SCIGN receivers. Since the GPS phase data are largely uncorrelated at I s, a higher sampling rate wouldoffer improved temporal resolution of ground displacement, so that in combination with inertial seismic data, instantaneous GPS positioning would in many cases significantly increase the observable frequency band for strong ground motions.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/01/20 alle ore 18:28:22