[1] Isotropic and anisotropic seismic structures across the Northern Apennines (Italy) subduction zone are imaged using a new method for the analysis of teleseismic receiver functions (RFs). More than 13,000 P‐wave coda of teleseismic records from the 2003–2007 Retreating‐Trench, Extension, and Accretion Tectonics (RETREAT) experiment are used to provide new insights into a peculiar subduction ...

a r t i c l e i n f o Keywords: East Pacific Rise mid-ocean ridge oceanic crust off-axis magmatism waveform modeling Formation of oceanic crust along the East Pacific Rise is thought to be complete within a few kilometers of the rise axis. Here, however, we present evidence for magmatism 20 km from the spreading center in 300-ka-old crust. Seismic data reveal an intrusive complex ~ 2 km beneath...

• Continental crust was formed during metamorphic events in amalgamated supercontinents. Granites by dehydration melting (upper crust) and mantle-derived fluids (lower crust). Mantle reach the middle-upper along shear zones generate granites. Until middle of 20th century, continental considered to be dominantly granitic. This hypothesis revised after Second World War when several new studies le...

Earthquakes in subduction zones occur the slab mantle, subducting crust, on plate interface, and, some cases, mantle wedge–regions that are separated by strong seismic discontinuities. These discontinuities typically imaged with techniques using teleseismic waves, while local earthquakes located based arrival times. While this combination of imaging and earthquake location provides a good initi...

Altaids in the Central Asian Orogenic Belt (CAOB) is one of world’s largest orogenic belts containing mineral deposits. Together with Junggar terrain they open an important window to study Paleozoic tectonic evolution CAOB. In this paper, we analyze a 637-km-long wide-angle refraction/reflection seismic profile across Altai-Eastern Tianshan belt southern Altaids, conducted September 2018 using ...

A total of 336 three-component strong-motion recordings from the Mw 6.35 Niu Dou earthquake of 25 June 1995 at a focal depth of 39.9 km in northern Taiwan are used to study the effects on strong ground motion due to Moho reflection of S waves. The residuals of both horizontal peak ground acceleration (PGA) and peak ground velocity (PGV) recorded from the earthquake are analyzed. The results con...

The free-air gravity in the Marmara Sea reveals that the low density of sedimentary basins is partly compensated in the lower crust. We compiled geophysical upper crust studies to determine the sediment basin geometries in and around the Marmara Sea and corrected the gravity signal from this upper crust geology with the Parker method. Then, assuming long wavelength anomalies in the residual gra...

In spite of numerous active and passive seismological investigations, the existence continuous or interrupted continental subduction below Western Alps is still open to debate. Many observations focus on Moho deeper part mantle, while reliable information Lithosphere-Asthenosphere Boundary (LAB) Alpine region scarce. Exploiting data from dense, broadband AlpArray Seismic Network we present a se...

[1] Abstract: Peridotite xenoliths erupted in late Miocene basalts ( 8 Ma) in the central Sierra Nevada sample a lithosphere that is vertically stratified in terms of age and thermal history. The deeper portions ( 45–100 km) have asthenospheric osmium isotopic compositons and possess textural and chemical evidence for cooling from >11008 to 700–8208C. The shallower portions (<60 km) have unradi...

The paper reports on the deep geophysical studies performed by Geological Survey of Russia (VSEGEI) under international project – Deep Processes and Metallogeny Northern, Central Eastern Asia. A model crustal structure is represented a set thickness maps 5400-km long geotransect across major tectonic areas Northeastern Eurasia. An area 50000000 km2 digitally mapped in uniform projection. show M...