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| Kong, Xiangchao; Li, Sanzhong; Wang, Yongming; Suo, Yanhui; Dai, Liming; Geli, Louis; Zhang, Yong; Guo, Lingli; Wang, Pengcheng. |
| Statistics about the occurrence frequency of earthquakes (1973-2015) at shallow, intermediate and great depths along the Izu-Bonin-Mariana (IBM) Arc is presented and a percent perturbation relative to P-wave mean value (LLNL-G3Dv3) is adopted to show the deep structure. The correlation coefficient between the subduction rate and the frequency of shallow seismic events along the IBM is 0.605, proving that the subduction rate is an important factor for shallow seismic events. The relationship between relief amplitudes of the seafloor and earthquake occurrences implies that some seamount chains riding on the Pacific seafloor may have an effect on intermediate-depth seismic events along the IBM. A probable hypothesis is proposed that the seamounts or... |
| Tipo: Text |
Palavras-chave: Philippine Sea Plate; Pacific Plate; Earthquake; Seamount; Slab tear; Subduction rate. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00407/51828/52427.pdf |
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| Gallais, Flora; Graindorge, David; Gutscher, Marc-andre. |
| In his Comment, A. Argnani argues that our interpretation of the STEP fault (named STEP-1 fault, in the Comment) is poorly constrained by the seismic data used in Gallais et al. (2013), and he particularly disagrees with our identification north of the Alfeo Seamount. A. Argnani is convinced that the tear fault is expressed by a belt of surface deformation, close to the Malta Escarpment. However, none of the seismic images published by A. Argnani show a crustal scale structure that could be associated with the presence at depth of a lithospheric tear. In that paper we documented the presence of a sub-vertical crustal scale fault, located 50 km east of the Malta Escarpment, with a northward increasing vertical offset (Gallais et al., 2013). The track of... |
| Tipo: Text |
Palavras-chave: Subduction zones; Lithospheric fault; Slab roll-back; Active deformation; Multichannel seismic profiles; Slab tear. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00160/27133/25331.pdf |
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| Gutscher, Marc-andre; Dominguez, Stephane; Mercier De Lepinay, Bernard; Pinheiro, Luis; Gallais, Flora; Babonneau, Nathalie; Cattaneo, Antonio; Le Faou, Yann; Barreca, Giovanni; Micallef, Aaron; Rovere, Marzia. |
| Subduction of a narrow slab of oceanic lithosphere beneath a tightly curved orogenic arc requires the presence of at least one lithospheric scale tear fault. While the Calabrian subduction beneath southern Italy is considered to be the type example of this geodynamic setting, the geometry, kinematics and surface expression of the associated lateral, slab tear fault offshore eastern Sicily remain controversial. Results from a new marine geophysical survey conducted in the Ionian Sea, using high-resolution bathymetry and seismic profiling reveal active faulting at the seafloor within a 140 km long, two-branched fault system near Alfeo Seamount. The previously unidentified 60 km long NW trending North Alfeo Fault system shows primarily strike-slip kinematics... |
| Tipo: Text |
Palavras-chave: Slab tear; Subduction; Mediterranean; Bathymetry; Seismics; Active faults. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00318/42924/42421.pdf |
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