Wednesday, October 22, 2008

Google blog is blocked again?

I cannot view my blog page now. But I can write blogs.

Why find command behave differently in Linux and Solaris?

In solaris, the find command gives that results sorted by letters.
However, in Linux, find command prints the results randomly.

IDl 7 is too slow.

Yes IDL 7 provides many new interesting features. However, it took up much of the CPU of my notebook. I had to revert to IDL 6.4 for best performance.

Tuesday, October 14, 2008

Agu web page bug?


<0.5 mm. The observed annual variations, however, disagree; this difference may be caused by some combination of local precipitation-induced site motion, unmodeled loading from other nearby sources, errors in the GSL model, and atmospheric errors." />

GEOPHYSICAL RESEARCH LETTERS, VOL. 30, NO. 3, 1111, doi:10.1029/2002GL016579, 2003

Crustal loading near Great Salt Lake, Utah

P. Elósegui and J. L. Davis

Harvard-Smithsonian Center for Astrophysics,
Cambridge, Massachusetts, USA

J. X. Mitrovica

Department of Physics, University of Toronto,
Toronto, Canada

R. A. Bennett

Harvard-Smithsonian Center for Astrophysics,
Cambridge, Massachusetts, USA

B. P. Wernicke

Division of Geological and Planetary Sciences, California Institute of Technology,
Pasadena, California, USA

Abstract

[1] Two sites of the BARGEN GPS network are located ~30 km south of Great Salt Lake (GSL). Lake-level records since mid-1996 indicate seasonal water elevation variations of ~0.3 m amplitude superimposed on a roughly “decadal” feature of amplitude ~0.6 m. Using an elastic Green's function and a simplified load geometry for GSL, we calculate that these variations translate into radial crustal loading signals of ±0.5 mm (seasonal) and ±1 mm (decadal). The horizontal loading signals are a factor of ~2 smaller. Despite the small size of the expected loading signals, we conclude that we can observe them using GPS time series for the coordinates of these two sites. The observed amplitudes of the variations agree with the predicted decadal variations to <0.5 mm. The observed annual variations, however, disagree; this difference may be caused by some combination of local precipitation-induced site motion, unmodeled loading from other nearby sources, errors in the GSL model, and atmospheric errors.

Received 7 November 2002; revised 4 December 2002; accepted 23 December 2002; published 5 February 2003.

Index Terms: 1208 Geodesy and Gravity: Crustal movements—intraplate (8110); 1243 Geodesy and Gravity: Space geodetic surveys; 1299 Geodesy and Gravity: General or miscellaneous; 8164 Tectonophysics: Evolution of the Earth: Stresses—crust and lithosphere.

Monday, October 13, 2008

Friday, October 10, 2008

Wanted papers

Becker, J., and M. Bevis (2004), Love’s problem, Geophys. J. Int., 156,171– 178.

Bevis, M., E. Kendrick, A. Cser, and R. Smalley (2004), Geodetic measurement of the local elastic response to the changing mass of water in Lago Laja, Chile, Phys. Earth Planet. Inter., 141, 71–78.

Dziewonski, A., and D. Anderson (1981), Preliminary reference Earth model, Phys. Earth Planet. Inter., 25, 297– 356.

Heki, K. (2001), Seasonal modulation of interseismic strain buildup in Northeastern Japan driven by snow loads, Science, 293, 89– 92.

Tuesday, October 07, 2008

love number


Love Number

h is the ratio of the height of a body tide to the static marine tide (introduced by A. E. H. Love). k is ratio of additional potential produced by the redistribution of mass to the deforming potential (introduced by A. E. H. Love). l is the ratio of horizontal displacement of the crust to that of the equilibrium fluid tide (introduced by T. Shida). For a rigid body,