Oblique subduction at a high rate of convergence along much of the Middle America Trench results in northwest-directed trench-parallel block motion. Accommodation of this motion along northwest-striking dextral strike-slip faults has been postulated; however, in Nicaragua such faults are not well developed. We suggest instead that this motion is accommodated by bookshelf faulting that includes ...

The Johanson Lake project is a two-year bedrock mapping program initiated by the Geological Survey and Development Branch in 2003 as part of the Toodoggone Targeted Geoscience Initiative (TGI). The project is focused on a belt of Mesozoic arc volcanic and plutonic rocks of the Quesnel Terrane in the eastern part of the McConnell Creek (94D) map sheet. This area contains a number of MINFILE occu...

by intermittent land masses on the northeast and southwest. The area has been cut by numerous right-lateral transcurrent faults and the stratified rocks now lie along the northeastern flank of the Coast Plutonic Complex. leletzky and Tipper (1968) described a faunal stratigraphy for the Taseko Lakes map sheet and discussed the role of the Qaughton trough in the geological history of southwester...

Two new species of Munidopsis are described from the wider New Zealand region. Munidopsis bamberi sp. nov. is described from the Havre Trough adjacent to the Kermadec Volcanic Arc north-east of the New Zealand continental shelf, and is named in honour of Roger Bamber for his contributions to arthropod taxonomy and systematics. The second species is M. sculpo sp. nov. from Forde Seamount on the ...

Many volcanic arcs display fast seismic shear-wave velocities parallel to the strike of the trench. This pattern of anisotropy is inconsistent with simple models of corner flow in the mantle wedge. Although several models, including slab rollback, oblique subduction, and deformation of water-rich olivine, have been proposed to explain trench-parallel anisotropy, none of these mechanisms are con...

Keppie et al. (2021) presented a Devonian to Carboniferous oroclinal bending hypothesis and dextral strike-slip translation of single arc terrane explain the distribution Cambrian Ordovician volcanic rocks in northern Appalachians. We contend that extant data are incompatible with this for reasons documented here.

The El Salvador Fault Zone (ESFZ) is part of the Central American Volcanic Arc and accommodates oblique separation movement between forearc sliver Chortis block (Caribbean Plate). In this work, a triclinic transtension model was applied to geological (fault-slip inversion, shape volcanic calderas), seismic (focal mechanisms) geodetic (GPS displacements) data evaluate characteristics last stages...