Institute of Geology and Geophysics

Seismic Signal Denoising via RRTO-Optimized VMD Combined with Spectral Kurtosis and Enhanced Wavelet Packet Thresholding

Abstract Seismic signal denoising is a key link to improve the interpretation accuracy of seismic data, especially in the complex noise background, where random noise and coherent noise will seriously interfere with the identification and extraction of effective signals. To this...

Dual Magnetite Formation Pathways in Abyssal Serpentinites From the Mid‐Atlantic Ridge

Abstract Serpentinization, which involves hydrothermal alteration of olivine and pyroxene in ultramafic rocks, generates magnetite and strongly modifies the magnetic properties of oceanic lithosphere. However, the microstructural pathways of magnetite formation and their bulk mag...

Nuclear tests at Mt. Mantap have reactivated intraplate faults

Underground nuclear explosions typically produce short-lived seismic sequences that decay rapidly after testing ceases. By contrast, seismicity near the Punggye-ri nuclear test site at Mt. Mantap in the Democratic People’s Republic of Korea has persisted and intensified for years...

Graphitization of nitrogen-bearing organic-like carbonaceous material in a dust particle from Chang’e-6 lunar samples

Abstract The delivery and evolution of carbonaceous materials to airless planetary bodies remain poorly constrained. This study characterized a porous, aggregated, carbon-rich dust particle (CE6-CDP) from Chang’e-6 lunar samples. CE6-CDP yielded a mean δ13CVPDB value of − 25.92 ±...

Sodium Lidar observed multiple sodium layer structures and their dynamical coupling mechanism

Abstract. On the night of 13 June 2013, the University of Science and Technology of China (USTC) sodium lidar observed multiple sporadic sodium layers (SSLs) and enhanced sodium patterns (ESPs) over Hefei, China (31.8°N, 117.3°E). These structures appeared at different times, col...

Harmonic reverse time migration

Abstract In subsurface regions containing gas or hydrocarbons, porous rocks, fluid-saturated zones, and fracture networks, seismic waves may propagate nonlinearly, resulting in harmonic generation, waveform distortion, and even the formation of shocks. To address these acoustic n...

Hybrid Physics-Data-Driven Framework for Blind Acoustic Impedance Inversion

Abstract Conventional acoustic impedance inversion methods have long faced technical bottlenecks such as inaccurate wavelet estimation and strong dependence on initial models. Although existing deep learning approaches can partially alleviate these problems, they often compromise...