Plate motion may be measured in situ as subsidence at trenches
The motion of the oceanic plates may be directly measured at trenches as the subsidence and possibly tilting rate though the intraplate deformations may affect the measure of long distances. A case is introduced where a part of the downgoing plate
is emerged above sea-level in the Izu peninsula near the trench axis.
Convective and dynamic instability in meridional trenches
-Kamchatka and Japan trenches. It was noted that dynamic stability condition in bottom layers of these trenches vary within tidal cycle. Interest to the problem of water stability in deep-sea basins was stimulated by discussion on possibility to bury
Progressive accretion in the Middle America Trench, Southern Mexico
The lithology and age distribution of a seismic unit characterised by landward dipping reflectors suggest progressive underthrusting and uplift of Trench deposits along the inner slope of the Middle America Trench. The fastest uplift and deformation
rates, and the most rapid change in tilt of dipping reflectors coincide near the base of the trench slope and diminish rapidly landwards.
The paper discusses independent methods of direct determination of age of the Pacific deep-sea trenches. The methods of trench dating are based on a recognition of the classic triad : structure - age - genesis for trenches, which have the thrust
contrasting situations : a) islands behind a subduction zone (the Law islands behind the Tonga trench in the Pacific| b) an island oceanwards of a trench (Christmas island near the Sunda trench in the Indian Ocean| c) islands scattered each side of a spreading
Aligned buoyant highs, across-trench deformation, clustered volcanoes, and deep earthquakes are not aligned with plate-tectonic theory
Bathymetry ; Earthquake ; Fault ; Global tectonics ; Ocean ; Pacific Region ; Plate tectonics ; Seamount ; Subduction ; Submarine volcanism ; Theory ; Trench
Bathymetry shows the regional interaction of aseismic, buoyant highs in northern Pacific subduction zones. Seamonts, ridges, and fractures on the seaward side of the trench are associated with events that do not support the accepted plate-tectonics
Major evidence on the driving mechanism of the Tyrrenian-Apenines arc-trench-back system from CROP seismic data
The results of deep seismic reflection exploration in the central mediterranean region (CROP Project) provide basic insights into the driving mechanism of the Tyrrenian-Apenines arc-trench-back system. In particular, such information clearly
This study included interpretation of aerial photographs, detailed geologic mapping of surficial deposits at trench sites, profiling fault scarps, excavating and mapping trenches at two sites, and radiocarbon dating key stratigraphic units
Evaluation of trenching, ground penetrating radar (GPR) and electrical resistivity tomography (ERT) for sinkhole characterization
This paper explores the suitability and advantages of combining the trenching technique with geophysical surveys [ground penetrating radar (GPR) and electrical resistivity tomography (ERT)] for sinkhole characterization in a mantled karst area
. The approach is applied to 2 active sinkholes concealed by anthropogenic deposits and formed by contrasting subsidence mechanisms; collapse and sagging. The stratigraphic and structural relationships observed in the trench were then used to infer the spatial
The Crotone Basin, located on a stack of nappes piled up during the late Paleogene-Neogene, formed in the late Neogene to Quaternary as a forearc basin of the Ionian arc-trench system. The process of slab rollback caused rapid trench migration