Vertical crustal motions from the DORIS Space-Geodesy System

New Vertical Geodesy

Vertical geodesy is undergoing a revolution because of two factors. First, new precise three-dimensional position measurement techniques used over very long distances and based on extraterrestrial reference systems provide a new class and precision of geometric data previously unavailable for geophysical investigations. Second, physical models in tectonic theory for large earthquakes predict cr...

Seismology and Space-based Geodesy

Equations for the estimation of strong ground motions from shallow crustal earthquakes using data from Europe and the Middle East: Vertical peak ground acceleration and spectral acceleration

This article presents equations for the estimation of vertical strong ground motions caused by shallow crustal earthquakes with magnitudes Mw ≥ 5 and distance to the surface projection of the fault less than 100 km. These equations were derived by weighted regression analysis, used to remove observed magnitude-dependent variance, on a set of 595 strong-motion records recorded in Europe and the ...

Horizontal versus vertical plate motions

We review both present and past motions at major plate boundaries, which have the horizontal component in average 10 to 100 times faster (10–100 mm/yr) than the vertical component (0.01–1 mm/yr) in all geodynamic settings. The steady faster horizontal velocity of the lithosphere with respect to the upward or downward velocities at plate 5 boundaries supports dominating tangential forces acting ...

Results from the Crystal Ball at Doris

_ Results are presented from studies of the inclusive photon spectra in hadronic decays of the ‘I’ and ‘I’ and the exclusive channel ‘I’ -+ 7r’I -+ @+f?-, by the Crystal Ball detector at DORIS II. We measure two signals in the ‘I” -+ 7 + anything inclusive channel at E(r) = 108.3 f 0.9 f 3.0 MeV and at E(r) = 127.5 f 1.2 f 4.0 MeV. Branching ratios obtained for these signals are: BR [T’ + q(108...