REFINED COSEISMIC DISPLACEMENT MODELING FOR THE 1994 SHIKOTAN AND SANRIKU-OKI EARTHQUAKES

Citation
Pr. Cummins et al., REFINED COSEISMIC DISPLACEMENT MODELING FOR THE 1994 SHIKOTAN AND SANRIKU-OKI EARTHQUAKES, Geophysical research letters, 25(17), 1998, pp. 3219-3222
Citations number
20
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Geosciences, Interdisciplinary
ISSN journal
0094-8276
Volume
25
Issue
17
Year of publication
1998
Pages
3219 - 3222
Database
ISI
SICI code
0094-8276(1998)25:17<3219:RCDMFT>2.0.ZU;2-Z
Abstract
We consider refined modeling of GPS measurements of coseismic displace ment for two large earthquakes occurring in the Japan and Kurile Trenc hes. Calculations are performed for a layered sphere and the homogeneo us half-space more commonly used to model such data, using fault geome try and slip distributions from previously published studies. We show that the difference between the layered sphere and homogeneous half-sp ace calculations can be significant, as expected from previous theoret ical studies. However, it does not appear large enough to seriously af fect results from previously published studies of these earthquakes. N evertheless, the fact that the effects of sphericity and especially la yering are measurable in coseismic observations of great earthquakes a t moderate distances indicates that these effects should be taken into account in order to fully exploit the precision of modern GPS measure ments.