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Applicability of Receiver Functions in a Subduction Zone:Case Study of the Avacha Bay Areaстатья
- Авторы: Goev A.G., Reznichenko R.A., Aleshin I.M.
- Журнал: Doklady Earth Sciences
- Том: 511
- Номер: 2
- Год издания: 2023
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 698
- Последняя страница: 702
- DOI: 10.1134/S1028334X23600743
- Аннотация: The peculiarities of waveforms of the P and S receiver functions, constructed from the records of three closely located broadband seismic stations, are studied. The stations are located in the Avacha Bay area, near the subducting part of the Pacific Plate. This is an inclined slab, which is characterized by higher seismic velocities and can cause complex patterns of seismic waves, thus distorting the waveforms of receiver functions. In order to reveal the degree of such influence, we calculated two pairs of receiver functions. To calculate the first pair, we used the seismic events where seismic waves traveled through the subducting oceanic slab; in the case of the second pair, the waves did not travel through the slab. It is shown that converted and multiple waves formed at the boundaries of the high-velocity layer considerable distort the shapes of P receiver functions beginning approximately 30 seconds after the main arrival. The subducting slab does not show any considerable effect on the records of the S receiver function. This fact empirically supports the applicability of local one-dimensional models for interpreting the receiver functions. The seismic noise, generated by the oceanic slab, limits the maximum depth of these models at around 200 km in the study area.
- Добавил в систему: Алёшин Игорь Михайлович