Comparative geochemistry of volcanics from rift valleys, transformfaults and aseismic ridges
It is suggested that transformfaults have, by faulting, exposed more fractioned types of basaltic rocks (may be as intrusives) than the rift valley volcanics. While aseismic ridges have undergone a greater degree of differentiation than both
Dykes and normal faults are the most common large-scale tectonic elements in Iceland. This paper summarises the main structral features of tension fractures, normal faults and dykes in Iceland as a basis for understanding their development
. It considers mainly the geometric characteristics of the faults and dykes themselves, and also explores the effects of mechanical layering on the structure and development of faults and dykes. The focus is on the attitude of dykes and faults, fault displacement
This paper addresses issues related to the Plio-Quaternary structural evolution of normal faults through the description of 5 cases in the central Apennines. Reported cases describe : re-utilization of portion of longer faults to accomodate minor
deformation or kinematic changes; along-strike migration or/and decreasing intensity of the tectonic activity. Aspects related to the structural modifications of normal fault systems will be finally discussed together with the implications they may have
Neotectonic and volcanic characteristics of the Karasu fault zone (Anatolia, Turkey) : the transition zone between the Dead Sea transform and the East Anatolian fault zone
The aim of this paper is to shed some light onto the neotectonic evolution of the Karasu Rift based on K-Ar dating of its volcanism, age and type of faulting during the Plio-Quaternary period.
comprises several WNW-trending fault segments that localise both strike-slip and normal movements, agreeing with a transtensional deformation pattern. The observations are consistent with the successive formation of transformfault segments from south
The AA. present a revisited structural pattern of the Húsavík-Flatey Fault (HFF) in the Tjörnes Peninsula, based on the mapping of tectonic features using satellite images, aerial photography, and field structural analysis. They show that the HFF
Dead Sea ; Fault ; Index ; Jordan ; Rift ; Structural geomorphology ; Tectonics ; Transformingfault
mountain fronts based on trend and continuity of the escarpment. The southern two fronts are controlled by two eroded boundary normal faults, while the northern front is controlled by the Dead Sea transformfault. - (NF)
Two morphotectonic indices (mountain front sinuosity, valley width to height ratio) were measured along the eastern rim of Wadi Araba, which represents the southern segment of the Dead Sea transform in Jordan. The area can be divided into three
C 14 dating ; Dead Sea ; Delta ; Earthquake ; Fault ; Graben ; Holocene ; Israel ; Neotectonics ; Quaternary ; Sedimentary ; Stratigraphy ; Transformingfault
The Holocene sequence of the fan-delta of Nahal Darga, in Israel, records deformation associated with earthquakes related to the Dead Sea Transform in general and to the Jericho Fault in particular. 20 radiocarbon ages help to date the earthquakes
that are inferred from displacement along faults, liquefaction features associated with 11 separate sandy and silty layers, and slumped allochtonous bodies of sediments located directly above one of the main splays of the Jericho Fault. On average, an earthquake
Recognition and assessments of faults within active strike-slip fault zones: a case study from the San Andreas fault in southern California
Neotectonics and active faulting
California ; Earthquake ; Fault ; Natural hazards ; Neotectonics ; Structural geomorphology ; United States
The present paper considers fault-related features as the result of the interplay of constructive influences (tectonic activity) and destructive influences (erosional and depositional activity).Variables affecting the geomorphological expression
of faulting are outlined with reference to examples along the San Andreas fault, and their significance for assessing strike-slip faulting activity is discussed.
The Tyrnavos Fault is typical of many active normal faults in the Aegean region. This study illustrates how a combination of geological and geomorphological data is important in assessing the magnitude and timing of palaeoearthquake activity along
Geomorphic analysis of late Quaternary faulting on Hilton Creek, Round Valley and Coyote warp faults, east-central Sierra Nevada, California, USA
C 14 dating ; California ; Earthquake ; Fault ; Moraine ; Quaternary ; Seismicity ; Sierra Nevada ; Stratigraphy ; Thermoluminescence ; United States of America
Fault scarps on surficial deposits that cross the Hiton Creek and Round Valley faults document repeated ground-rupturing events on these faults in the past 15,000 to 25,000 years. These data support the concept that the faults could produce a major
The AA. present an example of a large-scale normal fault system in southwest Turkey, namely Manisa Fault, to illustrate and discuss mechanism(s) responsible for the growth and evolution of large-scale corrugated normal faults. The paper provides
further information for better understanding the kinematics and development of the Manisa Fault and discusses its significance for the crustal extension prevailing in southwest Turkey.
Adjustments to calculated Quaternary displacement rates across the Fish Springs Fault, Owens Valley Fault Zone, California
Rectifications des données parues dans l'article Late Quaternary vertical displacement rate across the Fish Springs Fault, Owens Valley Fault Zone, California des mêmes auteurs (Quaternary Research 27, 113-129).
The South Scotia Ridge (SSR) is a submerged structural high located at the eastern continuation of the Antarctic Peninsula and representing the Scotia-Antarctica transform plate boundary. A three-dimensional geological model of a sector of the SSR
. Most of the active faults are located within the continental crust, however, deformation locally involves the oceanic crust and appears connected to the orientation and geometry of the fault system which defines the continent-ocean boundary. - (NF)
Geomorphology of faulting : the Wairapa Fault, New Zealand
Earthquake ; Fault ; Geomorphology ; Neotectonics ; New Zealand ; North Island ; Plate tectonics ; Quaternary ; Vertical movement
on the Wairapa Fault during a single earthquake in 1855 and the Holocene paleoseimic record as interpreted from small scale geomorphic features and regional uplift pattern, and 2) the relationship between vertical displacement on the Wairapa Fault and uplift
Quaternary landscape evolution in the San Jacinto fault zone, Peninsular Ranges of Southern California : transient response to strike-slip fault initiation
California ; Erosion ; Fault ; Fluvial capture ; Landslide ; Mountain ; Quaternary ; Stratigraphy ; United States of America
This study integrates data from sedimentology, stratigraphy, and process geomorphology, with additional information from prior work on structure, petrology, and tectonics in the fault zone. The AA. propose a hypothesis for geomorphic evolution
in the fault zone that highlights the effects of pronounced disequilibrium related to late Pliocene or early Pleistocene initiation of the San Jacinto fault.
This paper presents the results of fieldwork, and microstructural and diagenetic studies of the Psatha, Pisia and Kaparelli fault zones. These results are used to interpret the deformation mechanisms, fluid involvment and palaeo-stresses
for portions of the Pisia, Psatha, and Kaparelli fault zones. In particular, the identification of vadose calcite cements which have been deformed within the Psatha, Pisia and Kaparelli fault zones has allowed to examine the deformation and diagenesis which has