Laser strainmeters: New developments and earthquake prediction applications

Earthquake and hurricane coupling is ascertained by ground-based laser interferometer and satellite observing techniques

“…. ., which amplitude variations are synchronized to the strongest remote earthquakes with probability over 0.9 was found and approved decades ago (Dubrov et al, 1992) The precursor has become apparent as fading the amplitudes of spectral components at frequencies F 18 and F 26 in 1-3 Hz band during about 8 h. The most intensive components 1.94 Hz and 2.79 Hz in this band are about of 64 relative units in amplitude (see column of brightness scale to the right of each timefrequency diagrams on Fig. 5b and c) before precursor development.…”

“…These features are also inherent to precise pendulum tiltmeter instruments which are applied in our observations. number of experimental data in laser and pendulum instrument geophysical studies of the anomalous deformations and seismo-acoustic phenomena foregoing to earthquakes since our first tangible results (Dubrov et al, 1992;Petrova and Volkov, 1996).…”

Experience in synchronous observation of seismic-strain oscillations of the Earth by the spaced laser interferometers

“…Microseisms in a frequency band higher than 1 Hz are usually excited by artificial sources and form the spatially distributed coherent seismic field. Investigations of properties and behavior of wideband micro-seismic oscillations were considered as possible method of earthquake precursors studies [14,15].…”