Synthetic waveform modeling of the anomalous receiver functions for two stations in the eastern San Gabriel Mountains, California, suggests that a flat-topped notch structure exists on the Moho. North of the San Andreas Fault (SAF), the Moho depth is 36–38 km and is 33–35 km south of the San Gabriel Fault (SGF), but in-between under the Mt. Baldy block, it is only ∼29 km. The inferred notch str...

Abstract. For more than half a century, exploring complete sequence of the oceanic crust from seafloor through Mohorovičić discontinuity (Moho) and into uppermost mantle has been one most challenging missions scientific ocean drilling. Such technological achievement would provide humankind with profound insights largest realm our planet expand fundamental understanding Earth's deep interior its...

iran is located in a roughly triangular deforming region, consisting of relatively undeformed shield areas to the southwest (arabia) and northeast and the more recently deformed, though currently inactive, southwest afghanistan block in the east. the current geological and tectonic setting of iran is due to the ongoing convergence between the arabian and eurasian plates, which resulted in the f...

Fault development at mid-ocean ridge spreading centers is strongly dependent on the thermal state of the axial lithosphere. Thermal conditions at a ridge axis are a combined function of spreading rate, mantle temperature, magma injection, and hydrothermal circulation. In this study, we test the sensitivity of fault development in slow-spreading environments to the efficiency of hydrothermal coo...

[1] In this work we investigate the crustal and tectonic structures of the Central Tyrrhenian back-arc basin combining refraction and wide-angle reflection seismic (WAS), gravity, and multichannel seismic (MCS) reflection data, acquired during the MEDOC (MEDiterráneo OCcidental)-2010 survey along a transect crossing the entire basin from Sardinia to Campania at 40°N. The results presented inclu...

Seismic tomography traditionally inverts for velocity field on a regularly spaced and fixed-in-space model grid. Such an approach is not able to adequately describe pinchouts or wedge-shaped velocities as commonly seen at basin boundaries, faulted rock beds, and back-arc mantle wedges. A regularly spaced model grid also requires the use of a large number of model variables. This paper shows a d...

[1] We estimate crustal structure and thickness of South America north of roughly 40°S. To this end, we analyzed receiver functions from 20 relatively new temporary broadband seismic stations deployed across eastern Brazil. In the analysis we include teleseismic and some regional events, particularly for stations that recorded few suitable earthquakes. We first estimate crustal thickness and av...

The presence of PGM associated with the podiform chromitites in Jurassic–Cretaceous ophiolite Sebuku Island (South Kalimantan, Indonesia) is reported for first time. Two types chromitite have been recognized; one high-Cr composition (Cr/(Cr + Al) > 0.7) occurs deep mantle, other, high-Al < 0.6), located close to Moho transition zone. TiO2-Al2O3 relations indicate affinity IAT and MORB, ch...

Phases that arrive near the direct SV phase, including Sp (converted at the base of the Moho), SsPmP, and shear-coupled PL (SPL) waves, collectively sample the Earth’s crust and upper mantle at oblique angles and therefore have the potential to produce an accurate lateral average of structural properties than teleseismic P waves. SPL waves essentially mimic the propagation characteristics of re...