@article{fdi:010009470, title = {{F}rom oblique subduction to intra-continental transpression : structures of the southern {K}ermadec-{H}ikurangi margin from multibeam bathymetry, side-scan sonar and seismic reflection}, author = {{C}ollot, {J}ean-{Y}ves and {D}elteil, {J}. and {L}ewis, {K}.{B}. and {D}avy, {B}. and {L}amarche, {G}eoffroy and {A}udru, {J}.{C}. and {B}arnes, {P}. and {C}harnier, {F}. and {C}haumillon, {E}. and {L}allemand, {S}. and {M}ercier de {L}epinay, {B}. and {O}rpin, {A}. and {P}elletier, {B}ernard and {S}osson, {M}. and {T}oussaint, {B}ertrand and {U}ruski, {C}.}, editor = {}, language = {{ENG}}, abstract = {{T}he southern {K}ermadec-{H}ikurangi convergent margin, east of {N}ew {Z}ealand, accommodates the oblique subduction of the oceanic {H}ikurangi {P}lateau at rates of 4-5 cm/yr. {S}wath bathymetry and sidescan data, together with seismic reflection and geopotential data obtained during the {GEODYNZ}-{SUD} cruise, showed major changes in tectonic style along the margin. {T}he changes reflect the size and abundance of seamounts on the subducting plateau, the presence and thickness of trench-fill turbidites, and the change to increasing obliquity and intracontinental transpression towards the south. {I}n this paper, we provide evidence that faulting with a significant strike-slip component is widespread along the entire 1000 km margin. {S}ubduction of the northeastern scarp or the {H}ikurangi {P}lateau is marked by an offset in the {K}ermadec {T}rench and adjacent margin, and by a major {NW}-trending tear fault in the scarp. {T}o the south, the southern {K}ermadec {T}rench is devoid of turbidite fill and the adjacent margin is characterized by an up to 1200 m high scarp that locally separates apparent clockwise rotated blocks on the upper slope from strike-slip faults and mass wasting on the lower slope. {T}he northern {H}ikurangi {T}rough has at least 1 km of trench-fill but its adjacent margin is characterized by tectonic erosion. {T}he toe of the margin is indented by 10-25 km for more than 200 km, and thus is inferred to be the result of repeated impacts of the large seamounts that are abundant on the northern {H}ikurangi {P}lateau. {T}he two most recent impacts have left major indentations in the margin. {T}he central {H}ikurangi margin is characterized by development of a wide accretionary wedge on the lower slope, and by transpression of presubduction passive margin sediments on the upper slope. {S}hortening across the wedge together with a component of strike-slip motion on the upper slope supports an interpretation of some strain partitioning. {T}he southern {H}ikurangi margin is a narrow, mainly compressive belt along a very oblique, apparently locked subduction zone. ({R}{\'e}sum{\'e} d'auteur)}, keywords = {{TECTONIQUE} {DE} {PLAQUES} ; {SUBDUCTION} ; {GEOLOGIE} {STRUCTURALE} ; {BATHYMETRIE} ; {SONAR} ; {SISMIQUE} {A} {REFLEXION} ; {GEODYNAMIQUE} ; {FAILLE} ; {NOUVELLE} {ZELANDE} ; {KERMADEC} {REGION} ; {HIKURANGI} {REGION}}, booktitle = {}, journal = {{M}arine {G}eophysical {R}esearches}, volume = {18}, numero = {}, pages = {357--381}, year = {1996}, DOI = {10.1007/{BF}00286085}, URL = {https://www.documentation.ird.fr/hor/fdi:010009470}, }