Seismic structure in the northeastern South China Sea: S-wave velocity and Vp/Vs ratios derived from three-component OBS data

Magnetic recording of the Cenozoic oceanic crustal accretion and evolution of the South China Sea basin

“…The uppermost mantle beneath the COT and the offshore south China magnetic anomaly (SCMA) could also be magnetized (Figure 8). Deep seismic profiling found high-velocity layer caused by underplating in the lower crust beneath the COT of the northeast SCS continental margin [36,37]. Further investigations are needed to examine if the lower crust and upper mantle magnetization here are connected to the underplating.…”

Lithospheric low-velocity zones associated with a magmatic segment of the Tanzanian Rift, East Africa

“…It usually ranges between 1.6 and 2.0 and is sensitive to rock composition, especially to quartz and feldspar/plagioclase percentage. Vp/Vs ratio usually exhibits low values for felsic composition rocks (1.71 for granite, 1.78 for granodiorite) and increases for mafic rocks (1.84 for gabbro) (Holbrook et al 1992;Zhao et al 2010). The presence of fluids and partial melt are also known to control Vp/Vs ratios, the latter increasing with higher contents (Watanabe 1993).…”

Intra- and intertrench variations in flexural bending of the Manila, Mariana and global trenches: implications on plate weakening in controlling trench dynamics

“…(d) The free-air gravity anomaly (FAA) of the study region, with data extracted from the global database of Sandwell et al (2014). Wang et al 2006Wang et al , 2011Zhao et al 2010;Lin & Zhu 2015); H c is the average thickness of the model oceanic crust and ρ w , ρ s , ρ c and ρ m are the densities of sea water, sediment, crust and mantle, respectively (Table 1). Non-Airy-isostatic topography: we then calculated the non-Airyisostatic topography of the Manila Trench (T noniso , Fig.…”