Specification of mechanisms of earthquake sources in the Carpathian region

• Дата: 2014
• Автори: Malitskiy, D. V., Gritsay, O. D., Muyla, O. O., Kutniv, O. I., Kozlovskiy, E. M.
• Формат: Стаття
• Мова: Українська
• Опубліковано: S. Subbotin Institute of Geophysics of the NAS of Ukraine 2014
• Теми: earthquake source; graphic method; seismic wave; anisotropic medium
• Онлайн доступ: https://journals.uran.ua/geofizicheskiy/article/view/116032
• Назва журналу: Geofizicheskiy Zhurnal

One of the urgent problems - a solution of the focal mechanism of an earthquake is considered. On the example of several events occurred in the Carpathian region of Ukraine, the solving of this problem with a graphic method is proposed. This method is based on identifying the best location option of nodal planes relatively to both the fuzzy P-wave arrivals and the values of the logarithm of the ratio of the S-wave amplitude to the P-wave amplitude. A sequence of plotting diagrams for determining the focal mechanism is presented. The focal mechanisms and types of faults are determined by using this method for 6 events occurred in the Transcarpathian region. The similarity of the focal mechanisms for repeated earthquakes is shown. The dynamic parameters of the sources of 4 earthquakes occurred in 2012-2013 are retrieved by using data from the spectra of records converted into displacements according to the Brune model.