Seismic instruments: article

Registration of local earthquakes under Udinsky volcanoes (Kamchatka) by regional and temporary seismic stations. Refinement of the velocity model by reversing the hodograph of the deep source
1 Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences
2 Kamchatka branch of the Geophysical Survey of the Russian Academy of Sciences
Journal: Seismic instruments
Tome: 55
Number: 3
Year: 2019
Pages: 48-60
UDK: 550.34
DOI: 10.21455/si2019.3-3
Аnnotation file
Bibliographic list
Keywords: earthquake, volcano, seismic wave velocity, travel-time curve, Udinа seismic activation, Kamchatka
Аnnotation: Currently, Udinsky volcanoes (Kamchatka, Klyuchevskaya group of volcanoes) are considered extinct. However, at the end of 2017, for the first time in years of instrumental observations, seismic activation was recorded below them at the level of the middle-upper crust. To improve the accuracy of determining the coordinates of the hypocenters in the Udinsky volcanoes region, work was done to refine the local velocity model for this region. The refinement of the velocity structure of the medium was carried out using proprietary approaches to determining the coordinates of earthquake hypocenters and reversing the hodographs from deep sources. The values of seismic wave propagation velocities were obtained from earthquakes from the Udine seismic activation in 2017-2019. The results of the Kamchatka regional network and four additional temporary stations established specifically for the study of the Udinsky seismic generating region are used. A one-dimensional velocity model is obtained for depths up to 40 km: a set of layers in which the velocity f longitudinal waves varies linearly with a constant ratio V