Science and technological developments: article

EXPERIENCE IN EARTHQUAKE DETECTION WITH A DISTRIBUTED ACOUSTIC SENSOR (DAS), DEPLOYED ON THE BOTTOM OF THE BLACK SEA, FROM AUGUST 25 TO NOVEMBER 30, 2021
B.G. Gorshkov 1 D.A. Ilinskiy 2 D.E. Simikin 3 M.A. Taranov 3
1 Prokhorov General Physics Institute of the Russian Academy of Sciences 2 Shirshov Institute of Oceanology of Russian Academy of Sciences 3 PetroFibre LLC
Journal: Science and technological developments
Tome: 102
Number: 4
Year: 2023
Pages: 38–49
UDK: 550.34+550.8.052
DOI: 10.21455/std2023.4-2
Full text
Keywords: earthquake detection, fiber-optic sensor, optical streamer, DAS, Hormozgan double earthquake
Аnnotation: Practical results of earthquake detection with a distributed acoustic sensor (DAS) developed by PetroFibre LLC are reported. The working principle of the DAS is based on the interferometric detection of light resulted from Rayleigh scattering in optical fibers. The detected earthquake occurred in Iran. A fiber optic cable used as the sensitive element of the DAS was placed at the bottom of a shallow water region of the Black Sea. Gravity waves are shown to be a significant interference factor, preventing analysis of a wavefield for seismic event detection. Filtering the wavefield with a lower cut-off frequency exceeding 0.05 Hz was used to suppress the influence of the gravity waves. Directional pattern features of the fiber optic cable as a sensitive element are considered; results indicating lack of susceptibility of the cable to acoustic disturbances acting on it transversally are given.
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