Radial Anisotropy of the Upper Mantle of Southeastern Asia

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Дәйексөз келтіру

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Аннотация

Radial anisotropy of S-waves is observed as a difference between SV- and SH-wave velocities polarized in vertical and horizontal planes and obtained by inverting dispersion curves of Rayleigh and Love waves, respectively. Unlike isotropic models, the currently existing distributions of S-wave velocities that take radial anisotropy into account significantly contradict each other. One of the reasons for such discrepancies is that, as a rule, different data sets (paths) for Rayleigh and Love waves are used to calculate a radial anisotropy coefficient. This leads to the fact that the reconstructed velocity sections of SV- and SH-waves are smoothed over areas of different shapes and sizes. To eliminate this effect, an approach in which initial data contain only Rayleigh and Love wave dispersion curves along the same paths at the same periods is offered. Then, standard procedures of surface wave tomography and inversion of local surface wave velocities into S-wave velocity sections are implemented. Using such an approach, a distribution of radial anisotropy coefficient (α (VSH – VSV) / Vav, where Vav = (VSH + VSV) / 2) in the upper mantle of southeastern Asia to the depth of 300 km within 70°–145° E and 20°–40° N is obtained. It has been shown that at the depths of 50–70 km, maxima of α-coefficient are confined to areas with reduced SV-wave velocities. In addition, at 50 km, the maxima of α values tend to areas with maximum rates of horizontal displacements according to GPS data (relative to stable Eurasia). It has been revealed that areas with reliably established negative anisotropy (α less than –1%), i.e. in which VSV > VSH, are confined to the boundaries of lithospheric plates.

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Авторлар туралы

A. Filippova

Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation of the Russian Academy of Sciences

Хат алмасуға жауапты Автор.
Email: aleirk@mail.ru
Ресей, Troitsk

О. Solovey

Institute of the Earth’s Crust of the Siberian Branch of the Russian Academy of Sciences

Email: aleirk@mail.ru
Ресей, Irkutsk

Әдебиет тізімі

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2. Fig. 1. The region under study. Lithospheric plate boundaries are shown as red curves according to [Bird, 2003]. Lithospheric plates (letters in circles): A - Amurian, E - Eurasian, W - Zondian, I - Indian, O - Okhotom Sea, OK - Okinawa, T - Pacific, F - Philippine, I - Yangtze. Other abbreviations: SCS - South China Sea. Topography and bathymetry (h, m) are given according to the global model ETOPO 2022 [ETOPO..., 2024].

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3. Fig. 2. Earthquake epicentres (circles), seismic stations (triangles) used for calculations of the radial anisotropy coefficient.

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4. Fig. 3. Number of used seismic traces (N) depending on the period (T, s).

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5. Fig. 4. Southeast Asian average dispersion curves of surface wave group velocities with calculation errors (a) and their corresponding S-wave velocity sections (black curves) (b).

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6. Fig. 5. Examples of maps of distributions of the effective averaging radius (R, km). The period (T, s) is indicated above each map.

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7. Fig. 6. Examples of maps of surface wave group velocity variations relative to mean values (δU/Ucr, %). The period (T, s) and mean values of group velocities (Ucp, %) are indicated above each map. The boundaries of the region of acceptable resolution for each map are drawn at R = 600 km at the corresponding period (Fig. 5).

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8. Fig. 7. Examples of maps of S-wave group velocity variations relative to the mean values (δVS/VScp, %). The depth (H, km) and mean velocity (VSp, km/s) are shown above each map. The limits of acceptable resolution for each map were drawn at R = 600 km for a period of 100 s (Fig. 5).

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9. Fig. 8. Radial anisotropy coefficient (α, %). The depth (H, km) is indicated above each map. The limits of acceptable resolution for each map are drawn at R = 600 km for a period of 100 s (Fig. 5).

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