Abstract The origin and mantle dynamics of the Quaternary intraplate sodic potassic volcanism in northeast China have long been intensely debated. We present a high-resolution, three-dimensional (3-D) crust upper-mantle S-wave velocity (Vs) model by combining ambient noise earthquake two-plane wave tomography based on unprecedented regional dense seismic arrays. Our images highlight strong correlation between basalt geochemistry structure: Sodic volcanoes are all characterized prominent low...

The India‐Eurasia collision and the decratonization of North China Craton have drawn much attention from scientific community. Here we provide first large‐scale S wave velocity model for (CH11‐S) based on constraints both teleseismic surface body waves. We take advantage recent deployment 140 permanent stations Chinese Digital Seismic Network temporary network deployments to resolve lithospheric deeper mantle structure. Slow velocities are widespread in crust upper mantle. Deeply rooted fast...

Abstract We present new constraints on the upper mantle transition zone structure beneath eastern and southeastern Tibet based P wave receiver functions for a large broadband data set from two very dense seismic arrays. A clear depression of both 410 km 660 discontinuities is detected west Red River fault relative to east. The correlated topographic variations across are indicative temperature changes in above zone, which suggests that deep‐rooted penetrates into separates Indochina South...

A new 3-D shear wave velocity model of the northeastern (NE) Tibetan Plateau and western Sino-Korea Craton is presented. The based on Rayleigh waves recorded at 650 portable stations deployed in region. Interstation phase group dispersions for more than 18 000 paths were estimated using two-station method then inverted to produce maps 10–80 s period 10–60 period. Local 1-D profiles each 0.5° × 0.5°grid node obtained by inverting this study together with previously published velocities...

Abstract The eastern region of the Tibetan Plateau and surrounding regions have gentle to moderate topographic gradients, contrasting steep margins in northern southern Tibet. mechanisms for plateau growth Tibet are uncertain so far. Here we present a new shear wave tomography model derived from S traveltimes teleseismic waveforms recorded by dense ChinArray seismic network. reveals deep structures beneath its adjacent regions, showing clear velocity contrast boundaries roughly along...

Abstract Unprecedented levels of seismicity have been seen in southern Sichuan, China, since the large‐scale exploitation shale gas. Fluid and pore pressure transported through hydrological channel are thought as pivotal elements induction earthquakes. Our high‐resolution tomography results reveal two inclined seismic anomalies featured by low V s high p / at different depth range. The deeper anomaly extends 15 km from NE to SE connects well g 048 3 vicinity Ms 4.7 Gongxian earthquake 5.4...

We imaged the crust and uppermost mantle structure beneath northeastern (NE) China with fundamental mode Rayleigh waves recorded by 125 broad-band stations deployed in region. wave phase group velocities along more than 700 interstation paths were estimated using wavelet transformation method then these data utilized to construct 2-D velocity maps period range of 15–60 s. Owing dense ray coverage short path, our results provide better lateral resolution NE region compared previous studies....

A joint imaging by teleseismic converted and multiple phases is put forward to image the crustal structure beneath INDEPTH‐III passive seismic profile in central Tibet. depth dependent Vp/Vs ratio adopted map common conversion point (CCP) via a scanning stacking approach. Our new shows that crust divided into two sections with different Moho distributions amplitudes, boundary nearby Bangong‐Nujiang suture (BNS). negative P‐to‐S amplitude band located upper‐to‐middle crust, indicating low...

Abstract We present new, high‐resolution constraints on crustal and uppermost mantle structure of the southeastern, eastern, northeastern Tibetan plateau adjacent regions by combining extensive data from three regional‐scale dense seismic arrays. Our results show significant differences in within Songpan‐Ganzi terrane. The southern part has a thick crust high Poisson's ratio, while thickness becomes less ratio is nearly normal northeast. Prominent low‐velocity anomalies appear beneath both...

The crustal thickness H and average velocity ratio k (Vp/Vs) beneath south central Mongolia are investigated using the H-k stacking method based on teleseismic radial receiver functions. Our primary results reveal that local varies from 38 to 46 km with an value of 43 km. Thicker crust is found western Hentey Mountains, while thinner located in southern area Zuunbayan fault zone. Bouguer gravity anomalies exhibit a strong correlation overall pattern throughout most our study regime....

Joint inversion of interstation phase and group velocity dispersion data Rayleigh waves provides the regional shear-wave structure lithosphere across central eastern block North China Craton (NCC). Both curves Vs show strong lateral variation NCC, which correlates well with tectonic evolution. At lower crustal level, characteristics reveal differences in composition two blocks. In upper mantle, lithospheric removal NCC is more severe than NCC. The between imply that multistage reactivation...

Shear wave splitting parameters (fast polarization directions and times) obtained at the permanent broad-band station Wushi (WUS), which is situated in central Tien Shan, China, demonstrate systematic azimuthal variations. The fast range from 26° to 85° delay times 0.4 1.6 s, suggesting a complex anisotropic structure that cannot be adequately explained by single layer with horizontal axis of symmetry. variations have an apparent 90° periodicity thus can best two-layer model symmetry axes....

Abstract The detailed images of the mantle transition zone (MTZ) give insights into nature upwelling from deep Earth. We use receiver function to investigate MTZ structure beneath Mongolia Plateau using earthquakes recorded by 223 stations deployed in Central Asian Orogenic Belt. topographies 410 km (D410) and 660 (D660) discontinuities are both characterized slight depressions most parts Plateau. An obvious low‐velocity layer (LVL) atop with an average thickness ∼40 is observed this study...

SUMMARY Convolutional neural network (CNN) is presented to implement quick quality classification and inversion for teleseismic P-wave receiver functions (RF). For the first case, a CNN trained using field measured RFs from NE margin of Tibetan Plateau efficiently predict each input waveform. Signal-to-noise ratio correlation are introduced quantitatively determine label RF, avoiding subjectivity manual labelling. The reduces time needed data processing has higher accuracy efficiency than...