Study of tectonic earthquake precursors by geodetic methods
Abstract
Deformations of the Earth's surface which can be revealed by geodetic methods are among the most reliable earthquake precursors. A brief list is presented of geodetic leveling methods which have revealed the precursors of several earthquakes. To confirm the accuracy of determination of precursors of earthquakes based on the results of repeated leveling in epicenter zones and observations at Alma-Ata, the magnitudes of 7 earthquakes which occurred in northern Tien Shan during measurement of tectonic precursors were calculated and compared to valves based on seismologic measurements. The agreement found is satisfactory. A scientifically well-founded program of tectonic movements by geodetic methods in the northern Tien Shan has thus established the presence of tectonic precursors of earthquakes, determined the distances over which they are manifested and shown the possiblity of using the results of geodetic measurements in combination with geophysical and seismologic data to estimate the possible time of appearance of earthquake precursors.
- Publication:
-
USSR Report Earth Sciences JPRS UES
- Pub Date:
- February 1985
- Bibcode:
- 1985RpESc.......46S
- Keywords:
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- Deformation;
- Earthquakes;
- Geodesy;
- Tectonics;
- Earth Movements;
- Geophysics;
- Prediction Analysis Techniques;
- Seismographs