METER OF INFRALOW SEISMIC WAVES Russian patent published in 2000 - IPC

FIELD: seismology, national systems monitoring and processing data of geophysical measurements for prediction of earthquakes. SUBSTANCE: originating wave process have wide spatial swing with relatively short time of existence ( 2-3 min ) of indicator-forerunner of earthquake. To avoid omission of short-term event in time it is suggested that especially low harmonics of seismic field should be recorded in spatially-separated points of extended triangulation chain. Scalar field of tensions of seismic waves in separated points of space is measured by sensors based on Mach-Zehnder interferometer that form cruciform group by address sending of light pulses of helium laser. Numbering of analog signal from outputs of sensors and its processing are carried out directly in center. Correction of numbered discrete measurement readings for losses in splitters of light beam and for damping in fiber-optical lines is performed by calibration characteristics of paths. Correction of measurement matrixes by law known in advance presents standard mathematical operation included in package of specialized software. EFFECT: provision for remote measurement, increased sensitivity, expanded range of recorded seismic waves. 3 dwg