DETERMINATION OF EARTHQUAKE FOCUS COORDINATES USING THE CASSINI OVAL METHOD WITH SECOND- AND FOURTH-ORDER HYPERBOLA FIGURES
https://doi.org/10.21822/2073-6185-2019-46-4-134-142
Abstract
Objectives. To study the dependencies obtained when determining the coordinates of an earthquake hypocentre using the figures of fourth and second orders.
Method. A comparative analysis of determining the coordinates of the earthquake focus using the Cassini oval method, both taking errors in the readings of seismic sensors into account the and ignoring them, is presented.
Result. A new method is proposed for determining the coordinates of the earthquake hypocentre, which uses the fourth-order figure, the Cassini oval, in the calculations. A graph is obtained for the distribution of errors in determining the coordinates of the earthquake focus (using the Cassini oval) depending on the relative position of two seismic sensors with different values of their errors in determining the difference in travel times of seismic waves.
Conclusion. Since the calculation results are independent of the error sign in determining the difference in the arrival times of seismic waves, the method is suitable for the initial determination of the coordinates of the earthquake hypocentre as well as for comparison with the results of other methods for identifying the error sign.
Keywords
About the Authors
B. I. Shakhtarin
Bauman Moscow State Technical University
Russian Federation
Russian Federation
Dr.Sci. (Technical), Prof., Department «Autonomous Information and Control Systems»,
5 Baumanskaya St., Moscow 105005
T. G. Aslanov
Daghestan State Technical University
Russian Federation
Russian Federation
Cand. Sci. (Technical), Doctoral Cand., Head of Department of Management and Informatics in Technical Systems and Computer Engineering,
70. I. Shamil Ave., Makhachkala 367026
U. R. Tetakaev
Daghestan State Technical University
Russian Federation
Russian Federation
Cand. Sci. (Technical), Senior Lecture, Department of Management and Informatics in Technical Systems and Computer Engineering,
70. I. Shamil Ave., Makhachkala 367026
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Review
For citations:
Shakhtarin B.I., Aslanov T.G., Tetakaev U.R. DETERMINATION OF EARTHQUAKE FOCUS COORDINATES USING THE CASSINI OVAL METHOD WITH SECOND- AND FOURTH-ORDER HYPERBOLA FIGURES. Herald of Dagestan State Technical University. Technical Sciences. 2019;46(4):134-142. (In Russ.) https://doi.org/10.21822/2073-6185-2019-46-4-134-142
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