Earthquake of April 5, 2017, MW = 6.0 in the northeast of Iran: focal parameters, aftershock series and macroseismic manifestations
1 Geophysical Survey of the Russian Academy of Sciences
2 Institute of Seismology and Atmospheric Physics of the Academy of Sciences of Turkmenistan
Journal: Problems of Engineering Seismology
Tome: 49
Number: 4
Year: 2022
Pages: 5-20
UDK: 550.348.098.32 (571.53/.55)
DOI: 10.21455/VIS2022.4-1
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Petrova
L.V N.V. Earthquake of April 5, 2017, MW = 6.0 in the northeast of Iran: focal parameters, aftershock series and macroseismic manifestations // . 2022. Т. 49. № 4. С. 5-20. DOI: 10.21455/VIS2022.4-1
@article{Petrova
L.VEarthquake2022,
author = "Petrova
L.V, N. V.",
title = "Earthquake of April 5, 2017, MW = 6.0 in the northeast of Iran: focal parameters, aftershock series and macroseismic manifestations",
journal = "Problems of Engineering Seismology",
year = 2022,
volume = "49",
number = "4",
pages = "5-20",
doi = "10.21455/VIS2022.4-1",
language = "English"
}
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Keywords: Sefid Sang, focal mechanism, aftershock, shaking intensity, isoseist map, active fault, PGA, PGV
Аnnotation: The article considers the earthquake of April 5, 2017 with MW GCMT = 6.0 near the Turkmen-Iranian border, northeast of the Iranian village of Sefid Sang. During the entire seismic history of the region it turned out to be the strongest seismic event within a radius of 45 km from the epicenter. The earthquake caused widespread destruction in four villages, 2 people died and 100 were injured. The shaking was felt in the settlements of Iran, Turkmenistan and other countries. According to the constructed isoseismal map, northwestern orientation of isolines of equal intensity, coinciding with the strike of the nearest faults, and a strong attenuation of shaking intensity across tectonic structures were established. The macroseismic field equation is established, which is close to the Blake–Shebalin equation with average world coefficients. According both equations, the shaking intensity in the epicenter is estimated as I0 = 8. The northwestern (southeastern) orientation of the aftershock cloud and their migration to the southeast were discovered, which made it possible to choose the nodal plane of the focal mechanism of a similar strike as the active one. The rupture plane parameters, length L = 30 km and width W = 12 km, are estimated for the area of the highest density of aftershocks. A law of the aftershock number decrease with a time is established, which indicates a rapid decay of the aftershock process.