Part of a stretching transform fault system
... The NEeSW trending fault zone extends southwards across the Alborán Sea basin (LeBlanc and Olivier, 1984; De Larouzière et al., 1988; Grácia et al., 2006), where it is one of a group of perhaps linked faults that has been termed the trans-Alborán shear zone, extending into north Africa as the Nekor ...
... The NEeSW trending fault zone extends southwards across the Alborán Sea basin (LeBlanc and Olivier, 1984; De Larouzière et al., 1988; Grácia et al., 2006), where it is one of a group of perhaps linked faults that has been termed the trans-Alborán shear zone, extending into north Africa as the Nekor ...
Upper-mantle origin of the Yellowstone hotspot
... Regional Patterns of Middle Miocene Magmatism and Extension Volcanism associated with the Yellowstone hotspot began in the region of northern Nevada, southwestern Idaho, eastern Oregon, and southeastern Washington during a middle Miocene time of major tectonic reorganization throughout much of a reg ...
... Regional Patterns of Middle Miocene Magmatism and Extension Volcanism associated with the Yellowstone hotspot began in the region of northern Nevada, southwestern Idaho, eastern Oregon, and southeastern Washington during a middle Miocene time of major tectonic reorganization throughout much of a reg ...
PDF
... tidally modulated fluid flow within a network of shallow cracks. Tremor energy flux is spatially and temporally heterogeneous; however, there are extended periods of greater and lesser activity that can be tracked across portions of the array. Despite their shallow crustal origin, changes in tremor ...
... tidally modulated fluid flow within a network of shallow cracks. Tremor energy flux is spatially and temporally heterogeneous; however, there are extended periods of greater and lesser activity that can be tracked across portions of the array. Despite their shallow crustal origin, changes in tremor ...
Author`s personal copy - Géosciences Montpellier
... 2.4. Focus on the Zenisu Ridge Before being described as an ‘‘across-arc seamount chain’’, the Zenisu Ridge was interpreted as an intra-oceanic sliver (Le Pichon et al., 1987b). The pillow basalts sampled at its southwestern edge thus represent the top layer of an uplifted oceanic crust sequence of ...
... 2.4. Focus on the Zenisu Ridge Before being described as an ‘‘across-arc seamount chain’’, the Zenisu Ridge was interpreted as an intra-oceanic sliver (Le Pichon et al., 1987b). The pillow basalts sampled at its southwestern edge thus represent the top layer of an uplifted oceanic crust sequence of ...
Interpretation of heat-flow density in the Central Andes
... heat-flow density patterns. The more regional heatflow density pattern may be superimposed by local, near-surface effects such as, for example, the cooling of magma chambers at shallow depth. Quantitative models of different processes that influence the thermal structure and thus the heat-flow densi ...
... heat-flow density patterns. The more regional heatflow density pattern may be superimposed by local, near-surface effects such as, for example, the cooling of magma chambers at shallow depth. Quantitative models of different processes that influence the thermal structure and thus the heat-flow densi ...
Recent tectonics associated with the subduction : collision of the d
... and Weissel et al. (1982) is substantially different from that we observed. However, the contoured magnetic data (Fig. 4) suggest that small fracture zone offsets could exist, trending approximately N-S and occuring from the NW to the SE. Therefore, the true direction of the magnetic lineations coul ...
... and Weissel et al. (1982) is substantially different from that we observed. However, the contoured magnetic data (Fig. 4) suggest that small fracture zone offsets could exist, trending approximately N-S and occuring from the NW to the SE. Therefore, the true direction of the magnetic lineations coul ...
Low seismic-wave speeds and enhanced fluid
... zones give insight into past fluid activity in the crust, geophysical methods provide evidence of either interconnected fluid or high fluid pressure in currently active regions of the crust. This study presents geophysical evidence for fluids and high fluid pressure beneath the Southern Alps of New ...
... zones give insight into past fluid activity in the crust, geophysical methods provide evidence of either interconnected fluid or high fluid pressure in currently active regions of the crust. This study presents geophysical evidence for fluids and high fluid pressure beneath the Southern Alps of New ...
Crustal and upper mantle velocity structure of the Hoggar swell
... m in the Tahat hill ŽAtakor.. The Hoggar and other massifs of central Africa ŽAır, ¨ Eghei, Tibesti, Darfur, Cameroon mount, . . . . form a system of domal uplifts with similar scale, morphology and volcanic activity. The knowledge of the structure beneath the Hoggar swell will help us to understand ...
... m in the Tahat hill ŽAtakor.. The Hoggar and other massifs of central Africa ŽAır, ¨ Eghei, Tibesti, Darfur, Cameroon mount, . . . . form a system of domal uplifts with similar scale, morphology and volcanic activity. The knowledge of the structure beneath the Hoggar swell will help us to understand ...
Chapter 2. Geological, oceanographical and climatic setting
... included the subaerial and submarine mass movements, submarine eruptions, caldera collapse, basal surges and shock waves as major sources. Andrade et al. (2006) have built a dataset on tsunami-induced flooding of the Azores coast based on local monographs and newspapers, web citations and technical ...
... included the subaerial and submarine mass movements, submarine eruptions, caldera collapse, basal surges and shock waves as major sources. Andrade et al. (2006) have built a dataset on tsunami-induced flooding of the Azores coast based on local monographs and newspapers, web citations and technical ...
A Conceptual Model for Geothermal Energy Investigation with
... are developed to describe the relevant structures and physical processes of a problem. The choice of a model concept for the description of fractured media strongly depends on the scale of the problem, the geological characteristics of the area of investigation, and the purpose of the simulation. It ...
... are developed to describe the relevant structures and physical processes of a problem. The choice of a model concept for the description of fractured media strongly depends on the scale of the problem, the geological characteristics of the area of investigation, and the purpose of the simulation. It ...
ARTICLE IN PRESS
... The Tatun Volcano Group (TVG) is located at the northern tip of Taiwan, near the capital Taipei and close to two nuclear power plants. Because of lack of any activity in historical times it has been classified as an extinct volcano, even though more recent studies suggest that TVG might have been ac ...
... The Tatun Volcano Group (TVG) is located at the northern tip of Taiwan, near the capital Taipei and close to two nuclear power plants. Because of lack of any activity in historical times it has been classified as an extinct volcano, even though more recent studies suggest that TVG might have been ac ...
Mid-Atlantic Ridge–Azores hotspot interactions: along-axis migration
... Africa–North America–Eurasia (AFR–NAM–EUR) triple junction from the latitude of the Pico and East Azores Fracture Zones (Fig. 1a), to the vicinity of the North Azores Fracture Zone, where it is located at present [17]. Two elongated regions of anomalously shallow depths can be seen as V-shaped posit ...
... Africa–North America–Eurasia (AFR–NAM–EUR) triple junction from the latitude of the Pico and East Azores Fracture Zones (Fig. 1a), to the vicinity of the North Azores Fracture Zone, where it is located at present [17]. Two elongated regions of anomalously shallow depths can be seen as V-shaped posit ...
Poor deformation of a repeatedly erupting caldera in 2 decades
... caldera is 18 by 25 km wide and N-S elongated. It was formed by four major explosive eruptions ...
... caldera is 18 by 25 km wide and N-S elongated. It was formed by four major explosive eruptions ...
Iceland: Living with Volcanoes
... island. The exposure of recent volcanic lavas have given it some of the world’s most spectacular tectonic landscapes, but the slow rates of weathering – combined with the cool, damp climate – means that arable farming takes place on just over 1% of the land area. Located on a tectonic ‘hotspot’ (see ...
... island. The exposure of recent volcanic lavas have given it some of the world’s most spectacular tectonic landscapes, but the slow rates of weathering – combined with the cool, damp climate – means that arable farming takes place on just over 1% of the land area. Located on a tectonic ‘hotspot’ (see ...
Shape, rheology and emplacement times of small martian shield
... that (1) shield volcano shapes can be affected by ash falls, (2) the Dupuit approximation is not valid in the vent region, and (3) the theoretical shape does not reproduce the real shape of shield volcanoes. Concerning the first of these issues, martian shield volcanoes are likely formed almost exclu ...
... that (1) shield volcano shapes can be affected by ash falls, (2) the Dupuit approximation is not valid in the vent region, and (3) the theoretical shape does not reproduce the real shape of shield volcanoes. Concerning the first of these issues, martian shield volcanoes are likely formed almost exclu ...
PowerPoint Presentation - Slide 1
... Extrusion of a lava dome or lava flows (nonexplosive eruption) may be occurring. ...
... Extrusion of a lava dome or lava flows (nonexplosive eruption) may be occurring. ...
3A 3B 3C - Oxford University Press
... as ash or lava or both. As lava flows across the surface it covers the rocks from previous eruptions and builds up the height of the land in layers. Runny lava can travel many kilometres from the crater and leave behind a shallow layer of new rocks over a wide area. These types of volcanoes are know ...
... as ash or lava or both. As lava flows across the surface it covers the rocks from previous eruptions and builds up the height of the land in layers. Runny lava can travel many kilometres from the crater and leave behind a shallow layer of new rocks over a wide area. These types of volcanoes are know ...
Future volcanism at Yellowstone caldera
... lineaments, the first coinciding with the western caldera rim, the second lying across the central region of the caldera, and the third extending across the northeastern caldera. The first two lineaments focused recent intracaldera volcanism (174–70 ka), while the latter is the most active in terms ...
... lineaments, the first coinciding with the western caldera rim, the second lying across the central region of the caldera, and the third extending across the northeastern caldera. The first two lineaments focused recent intracaldera volcanism (174–70 ka), while the latter is the most active in terms ...
Overthrusting and sediment accretion along Kl
... also moving seaward, by a process referred to as volcanic spreading; this provides an alternative explanation for the bench, i.e., overthrusting along the edge of the sliding flank. The latter interpretation is consistent with new seismic reflection data across the submarine flank. A prominent refle ...
... also moving seaward, by a process referred to as volcanic spreading; this provides an alternative explanation for the bench, i.e., overthrusting along the edge of the sliding flank. The latter interpretation is consistent with new seismic reflection data across the submarine flank. A prominent refle ...
Topic: Rivers
... Case study: I know about an earthquake event in a LEDC (Boxing Day Tsunami in Indonesia) Case study: I know about an earthquake event in a MEDC (L’Aquila in Italy but could also use Christchurch in New Zealand) ...
... Case study: I know about an earthquake event in a LEDC (Boxing Day Tsunami in Indonesia) Case study: I know about an earthquake event in a MEDC (L’Aquila in Italy but could also use Christchurch in New Zealand) ...
Paper Submission Template - Lancaster EPrints
... triggered by compressive stresses that act on the magma chamber (Nakamura, 1975; Nostro et al., 1998) and others emphasize that decompressive stresses are more important because they enable more magma to enter the chamber, inflating it (Bursik et al., 2003; Walter et al., 2006). Finally, Hill et al. ...
... triggered by compressive stresses that act on the magma chamber (Nakamura, 1975; Nostro et al., 1998) and others emphasize that decompressive stresses are more important because they enable more magma to enter the chamber, inflating it (Bursik et al., 2003; Walter et al., 2006). Finally, Hill et al. ...
Intrusive dike complexes, cumulate cores, and the extrusive growth
... [7] Intrusive complexes are observed beneath all volcanoes, with the maximum intrusive complex volume ranging up to 10,550 ˙ 2600 km3 (Kaua‘i; Table 1). The olivine contents of the intrusive complexes, estimated as a percentage of the total isosurface volume if the average density was due to only ol ...
... [7] Intrusive complexes are observed beneath all volcanoes, with the maximum intrusive complex volume ranging up to 10,550 ˙ 2600 km3 (Kaua‘i; Table 1). The olivine contents of the intrusive complexes, estimated as a percentage of the total isosurface volume if the average density was due to only ol ...
Long-Term Volumetric Eruption Rates and Magma Budgets Scott M
... volcano; longer periods are generally required for volcanic centers erupting more compositionally-evolved magma due to lower eruption recurrence interval. Thus, a period of ~103 years may be a long time for a basaltic shield volcano (e.g., Kilauea, Hawaii) but captures only an insignificant fraction ...
... volcano; longer periods are generally required for volcanic centers erupting more compositionally-evolved magma due to lower eruption recurrence interval. Thus, a period of ~103 years may be a long time for a basaltic shield volcano (e.g., Kilauea, Hawaii) but captures only an insignificant fraction ...
Evolution of Landforms Due to Internal Forces
... you have probably seen pictures or films of erupting volcanoes. These conical forms are one example of the land forms we will study in this chapter. A volcano is a vent or an opening in the earth’s crust through which molten rock material, rock fragments, ash, steam and other hot gases are emitted s ...
... you have probably seen pictures or films of erupting volcanoes. These conical forms are one example of the land forms we will study in this chapter. A volcano is a vent or an opening in the earth’s crust through which molten rock material, rock fragments, ash, steam and other hot gases are emitted s ...
Volcanology of New Zealand
Volcanology of New Zealand is the scientific study of volcanoes and volcanic phenomena in New Zealand. Volcanism has been responsible for many of the country's geographical features, especially in the North Island and the country's outlying islands.While the land's volcanic history dates back to before the Zealandia microcontinent rifted away from Gondwana 60–130 million years ago, activity continues today with minor eruptions occurring every few years. This recent activity is primarily due to the country's position on the boundary between the Indo-Australian and Pacific Plates, a part of the Pacific Ring of Fire, and particularly the subduction of the Pacific Plate under the Indo-Australian Plate.New Zealand's rocks record examples of almost every kind of volcanism observed on Earth, including some of the world's largest eruptions in geologically recent times.None of the South Island's volcanoes are active.