Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 8 of 8 for “"Dyke intrusion"”.
-
The 2014-15 Bárðarbunga-Holuhraun magmatic rifting episode: A seismic study
… central Iceland. Over the course of two weeks a dyke propagated 48 km beneath the glacier northeastwards and into the Holuhraun lava field, where it erupted for six months, becoming the largest eruption in Iceland for over 200 years. During this time, a gradual, incremental caldera collapse took …
-
Dyke-induced earthquakes during the 2014-15 Bárðarbunga-Holuhraun rifting event, Iceland
Understanding dykes is vital as they serve both as bodies that build the crust and as conduits that feed eruptions. The 2014-15 Bárðarbunga-Holuhraun rifting event comprised the best-monitored dyke intrusion to date and the largest eruption in Iceland in 230 years. Over a 13 day period magma …
-
Metamorphism and Deformation in Early Proterozoic Basic Dykes Near Scourie, Northwest Scotland (Amphibolite)
Early Proterozoic amphibolite dykes of the Scourie Dyke swarm, exposed in the transitional Archean to Proterozoic Lewisian basement near Scourie, Northwest Scotland, exhibit complex morphologies, mineralogies, and microfabrics. Dyke morphology is often highly variable, and was controlled to a large …
-
Towards monitoring volcanoes in Iceland and Hawai’i with seismic velocity variations
… associated with the 2014 Bárðarbunga-Holuhraun dyke intrusion. The intense seismicity associated with the subsequent rifting event alters the CCFs, making measurements of dv/v unreliable during the 6-month eruption. However, volcanic tremor can be located by measuring the arrival times of the …
-
The geochemistry, kinematics and geodynamics of the Gannakouriep dyke swarm
The Gannakouriep dyke swarm comprises a linear swarm of north to northeast striking mafic dykes emplaced during late Proterozoic rifting in the Gariep belt. The swarm has a strike length of over 300 km crossing terrane boundaries of the Gordonia sub-province, Richtersveld igneous sub-province and 8 …
-
Propagation of fluid driven fractures in transversely isotropic material
… systems) but also occurs naturally (magmatic dyke intrusion). While the mechanics of hydraulic fractures (HF) in isotropic media is well established, the impact of the anisotropy of natural rocks on HF propagation is still far from being understood. Sedimentary rocks like shales and mudstones …
-
Seismicity associated with magmatic intrusions: insights from the Reykjanes Peninsula, southwest Iceland
… governing the ongoing eruptions and the magmatic intrusions that precede them. Microseismicity is a powerful lens through which to view these processes, providing the means to track melt movement as it triggers earthquakes in the surrounding crust. This dissertation makes use of an exceptional …
-
Rheological response to tectonic and volcanic deformation in Iceland
… by magmatic activities in the form of dyke intrusion. However, the center of the rift and the maximum subsidence geographically coincides in the WVZ and the NVZ, whereas in the EVZ, the maximum subsidence is offset ~8 km to the east of the spreading center. In the NVZ, the Askja volcano …