Detection of anomalous S_diff postcursors sampling the core-mantle boundary beneath the Southern Pacific

Beamforming and forward waveform modeling analyses find a new ultra-low velocity zone (ULVZ) with an uncertain location beneath the southern Pacific

This provides a potential new seismic example to support the correlation between surface ocean island basalts and ULVZs

Structural anisotropy causes anisotropic behavior of hydro-mechanical response of a shale in confined and unconfined laboratory experiments

Loading configuration influences elasticity, poromechanics, and failure behavior in tensile, uniaxial and triaxial compressive loading

Failure causes shear strain localization by different microstructural expressions in accordance with analyses of effective stress paths

Geochemical features and thermodynamic modeling reveal a record of melting events under both convergent and divergent plate margins

Significant Os isotope heterogeneities show that the melting events occurred long before obduction of the massif onto the continent

The convecting upper mantle preserves heterogeneous domains with different fertilities and melting histories for long periods

Early-formed zircon crystals or domains are isotopically lighter in Zr than those crystallized late in both mafic and felsic rocks

Diversity in textural occurrences and sizes of zircons potentially explain the Zr isotopic heterogeneity at the mineral scale

Geochemical information extracted from separated minerals does not always reflect the nature of primitive magma

Spatial stress variations within a fault zone can be indicated by the breakout rotations therein

Breakout rotations occur at different scales, indicating significant stress heterogeneity across scales

It is inferred that the two horizontal stresses become more isotropic, accompanied by complex stress rotations within the fault zone

Image and geophysical logs were obtained in a borehole drilled to nearly 2.5 km in the stable metamorphic craton in northeast Alberta

Breakout (BO) directions change over distinct depth sections, and these mostly correlate with metamorphic foliations and elastic anisotropy

BO morphologies interpreted under the rock anisotropic paradigm indicate lower stress magnitudes than those inferred conventionally

Ab initio results on the Pv-PPv transition in Fe- and Al-bearing bridgmanite are consistent with experimental measurements in phases with similar compositions

Plausible compositions display wide transition pressure ranges. A change of aggregate composition across a sharp D” discontinuity is likely to occur

The Pv-PPv exothermic transition does not contribute significantly to the thermal boundary layer atop the core-mantle boundary

Extended Bott's method for inversion and Gauss-Fast Fourier Transform based forward model ensuring high precision

Removal of gravity anomalies due to density heterogeneities compared to the global model

High resolution Moho surface beneath the Indian Peninsula and adjacent region

The moderate 2020 M_w 6.0 Kalpin earthquake was initiated on a weak décollement in southwest Tian Shan

Seismological data and Interferometric Synthetic Aperture Radar postseismic time series analysis confirm a vertical separation of the mainshock and aftershocks

Combination of thin-skin and thick-skin deformation processes throughout the different stages of the seismic cycle

Large digital rock data sets are generated for use in machine learning research of permeability prediction

3-D convolutional neural network with transfer learning is efficient to estimate permeability of sub-volumes of digital rocks

The hierarchical homogenization method provides a computationally efficient way to predict effective permeability of large digital rock samples

SS precursors reveal depths of the lithosphere–asthenosphere boundary independent of seafloor age

The oceanic lithosphere–asthenosphere boundary is a strong reflector and can be explained by 1.5%–2% of partial melt

Large depth variations of the top and the bottom boundaries of the asthenosphere suggest a heterogeneous melting process

We develop a stress relaxing simulation (SRS) method on the digital rock to compute the effective elastic and attenuation signature of heterogeneous porous rocks

SRS method is able to characterize attenuation due to wave-induced fluid flow and scattering as well as their interactions simultaneously

The reliability and accuracy of the SRS method are benchmarked with existing well-developed digital rock physics methods

We measure elastic wave velocities in saturated rocks, to analyze the effects of crack closure, squirt flow and acoustoelasticity

To this purpose, we develop an unrelaxed double-porosity acoustoelasticity model

Crack closure dominates, followed by the squirt-flow mechanism at low differential pressures, while acoustoelasticity effects are important at high differential pressures. In granites, the last effect prevails

We build an extensive earthquake catalog using our new fully automated method along the western North Anatolian Fault Zone (NAFZ)

We observe variable statistical properties (b-value and temporal clustering) along the NAFZ

High b-value and strong temporal clustering may suggest the occurrence of slow slip in the Lake Sapanca step-over

Systematic measurements on the grain bulk moduli of 38 sandstone samples through unjacketed tests

Grain bulk modulus of sandstone ranges broadly due to deposition, composition, and microstructure differences

Cementation is a dominant factor controlling sandstone grain bulk modulus

An anisotropic shear wave model beneath South China is constructed by multimode surface wave tomography with improved vertical resolution

Sichuan basin shows negative radial anisotropy, reflecting the influence of eastward compression and mantle flow under the Tibetan Plateau

The low-velocity anomaly and strong negative radial anisotropy of the Hainan Island may be related to the Hainan mantle plume

Dynamic SV-wave signatures of fluid-saturated porous rocks containing intersecting fractures are studied and compared to P-waves

Fracture-Background Wave-induced Fluid Flow causes much smaller dispersion and attenuation for SV-waves than for P-waves

SV-wave anisotropy is greatly affected by Wave-induced Fluid Flow and elastic scattering, which has distinctly different features compared to P-waves

We combine separate geophone deployments with broadband data using ambient noise and beamforming to measure H/V ratios and phase velocity

A low velocity zone likely exists at approximately 10 km depth coinciding with areas of high surface heat flux and geothermal activity

We find strong similarities between the geothermal region in Utah and the Coso geothermal field

The molecular dynamics simulations are investigated to study the anisotropic behavior of single crystalline quartz

Maximum stress under uniaxial tension is greater in z (c-axis) than in other directions

Young's modulus varies in different crystallographic directions

Many small faults near the Húsavík-Flatey transform fault appear to have experienced large-magnitude vertical-axis rotations

Previous paleostress studies have likely overestimated the temporal variability in the stress field around the transform fault

Inferences about the relative timing of structures provide insight into the tectonic history of off-fault deformation