Transient gravity perturbations induced by earthquake rupture

Transient gravity perturbations induced by earthquake rupture

J. Harms,1,2,∗ J.-P. Ampuero,3 M. Barsuglia,4 E. Chassande-Mottin,4 J.-P. Montagner,5 S. N. Somala3 and B. F. Whiting4,6 1Università degli Studi di Urbino “Carlo Bo”, I-61029 Urbino, Italy. E-mail: [email protected] 2INFN Sezione di Firenze, I-50019 Sesto Fiorentino, Italy 3Seismological Laboratory, California Institute of Technology, Pasadena, CA 91125, USA 4APC, AstroParticule et Cosmologi...

Prompt gravity signal induced by the 2011 Tohoku-Oki earthquake

Transient gravity changes are expected to occur at all distances during an earthquake rupture, even before the arrival of seismic waves. Here we report on the search of such a prompt gravity signal in data recorded by a superconducting gravimeter and broadband seismometers during the 2011 Mw 9.0 Tohoku-Oki earthquake. During the earthquake rupture, a signal exceeding the background noise is obs...

Inflaton perturbations in brane-world cosmology with induced gravity

We study cosmological perturbations in the brane models with an induced Einstein-Hilbert term on a brane. We consider an inflaton confined to a de Sitter brane in a five-dimensional Minkowski spacetime. Inflaton fluctuations excite Kaluza-Klein modes of bulk metric perturbations with mass m = −2(2l− 1)(l+ 1)H and m = −2l(2l+ 3)H where l is an integer. There are two branches (± branches) of solu...

The Mechanics of Earthquake Rupture

Earthquake lights and rupture processes

A physical model of earthquake lights is proposed. It is suggested that the magnetic diffusion from the electric and magnetic fields source region is a dominant process, explaining rather high localization of the light flashes. A 3D numerical code allowing to take into account the arbitrary distribution of currents caused by ground motion, conductivity in the ground and at its surface, includin...