MOMENT TENSOR INVERSION OF WAVE FORMS
Тип публікації :
Стаття
Дата випуску :
2015
Автор(и) :
Малицький, Д.
Муйла, О.
Грицай, О.
Кутнів, О.
Обідіна, О.
Мова основного тексту :
Англійська
eKNUTSHIR URL :
Том :
1
Випуск :
68
ISSN :
1728-2713
Початкова сторінка :
80
Кінцева сторінка :
85
Цитування :
[APA 7] Малицький, Д., Муйла, О., Грицай, О., Кутнів, О., & Обідіна, О. (2015). ВИЗНАЧЕННЯ ТЕНЗОРА СЕЙСМІЧНОГО МОМЕНТУ З ХВИЛЬОВИХ ФОРМ. Вісник Київського національного університету імені Тараса Шевченка. Геологія, 1(68), 80–85. https://doi.org/10.17721/1728-2713.68.14.80-86
[ДСТУ] ВИЗНАЧЕННЯ ТЕНЗОРА СЕЙСМІЧНОГО МОМЕНТУ З ХВИЛЬОВИХ ФОРМ / Д. Малицький et al. Вісник Київського національного університету імені Тараса Шевченка. Геологія. 2015. Vol. 1, no. 68. P. 80—85. DOI: 10.17721/1728-2713.68.14.80-86 (date of access: 25.07.2026).
The authors present a moment tensor inversion of waveforms, which is more robust and yields more stable and more accurate results than standard approaches. The inversion is solved in two steps. First, a point source of seismic waves is considered, with defined location and origin time. Matrix method is used to solve the problem of wave propagation in the medium modeled as a horizontally layered heterogeneous elastic structure (isotropic and/or anisotropic). In order to allow the source mechanism to change with time each moment tensor component has its own time history. The source is described by the full moment tensor lm M A numerical technique developed based on forward modeling is used for the inversion of the observed waveforms for the components of moment tensor and the earthquake source-time function (STF(t)). The method provides a good estimate for the complete mechanism when records are treated, which corresponds to a velocity model contained inside the interpolation range. The method of waveform inversion using only direct P- and S-waves at stations that we have developed allows us to retrieve the moment tensor of a point source as a function of time. We computed the moment tensor solutions also using the graphic method. The traditional graphical method is based on the P-waves prior arrival using information about fuzzy first motion and the S/P amplitude ratio. The polarities between P-waves first motion were defined from complete records on seismograms taking into account the possible inversion of the sign on the z-component. A logarithm of the S/P amplitude ratio is calculated using seismic data received at each station from the three components. Input data for the azimuth and take-off angle are calculated by software packages for each event. Finally, the proposed moment tensor inversion is tested on real data for the earthquakes of 24.04.2011 (13h02m12s, 35.92°N, 14.95°E (near Malta), Mw4.0) and 29.12.2013 (17h09m0.04s, 41.37°N, 14.45°E (Southern Italy), Mw4.9).
Файл(и) :![Ескіз]()
Вантажиться...
Формат :
Adobe PDF
Розмір :
719.2 KB
Контрольна сума :
(MD5):94992b08f606075ec51ef4e3bb4b70f4
Якщо не вказано інше, ця робота розповсюджується на умовах ліцензії Creative Commons Attribution 4.0 International