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Showing 1 to 20 of 83 for “"Volcanic activity"”.
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A statistical analysis of the volcanic activity at Stromboli, Italy.
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1973.
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Historic and prehistoric volcanic activity on St Kitts and Nevis, West Indies: Controls on future hazard
… was undertaken to understand the most recent volcanic activity on the islands, and to assess likely future eruption styles and scenarios. A new analysis of archival records suggests that there may not have been activity at Mt Liamuiga in historic times. The 1690 activity may have been …
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Petrology and geochemistry of the recent eruption history at Rabaul Caldera, Papua New Guinea : implications for magmatic processes and recurring volcanic activity
… opposing sides of the caldera. A second phase of activity (Phase 2), beginning on 28 November 1995 and continuing until the present (2003), is characterised by intermittent vulcanian and strombolian eruptions that are restricted to Tavurvur, on the northeastern side of Rabaul Caldera...Comparison …
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Petrology and geochemistry of the recent eruption history at Rabaul Caldera, Papua New Guinea : implications for magmatic processes and recurring volcanic activity
… opposing sides of the caldera. A second phase of activity (Phase 2), beginning on 28 November 1995 and continuing until the present (2003), is characterised by intermittent vulcanian and strombolian eruptions that are restricted to Tavurvur, on the northeastern side of Rabaul Caldera...Comparison …
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Volcanic Activity and Human Occupation of the Northern Andes: The Application of Tephrostratigraphic Techniques to The Problem of Human Settlement in The Western Montana During The Ecuadorian Formative
… which represents a short period of intense volcanic activity dating to 335 B.C. The Tulipe Phase occupation is also mantled by a tephra deposit dated A.D. 1660. The sources for the two tephra mantles are Volcano Pululagua (Nueva Era Phase tephra) and Guagua Pichincha (Tulipe Phase tephra). …
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QUANTIFICATION OF MELT DISTRIBUTION, MELT CONNECTIVITY, AND ANISOTROPIC PERMEABILITY OF DEFORMED PARTIALLY MOLTEN ROCKS USING X-RAY MICROTOMOGRAPHY
Volcanic activity plays a dominant role in shaping the surface of Earth and other planets. For example, Earth’s ocean floor is created by volcanic activity at mid-ocean ridges. There, magma is sourced from a ~60 km deep, ~100 km wide region of the mantle, from which partial rock ascends and erupts …
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Volcanic risk assessment: integrating hazard and social vulnerability analysis
The vulnerability of communities at risk from volcanic activity at Volcan Tungurahua, Ecuador and Mount Rainier in the USA provided the focus for this thesis. The research aimed to develop an integrated approach to risk assessments that combined both hazard and vulnerability analysis. In phase one, …
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Analysis of microbes in Greenland ice cores from periods of high and low atmospheric carbon dioxide levels
… contained black particulate matter indicative of volcanic activity. Major volcanic activity was reported in Iceland, Alaska, and from a super volcano in Italy during the 10,500 ybp time period. The 157,000 ybp sample also contained a large number of Proteobacteria and Firmicute species, a few …
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A Geophysical Survey Of Active Volcanism In The Central And Southern Andes
… volcanism along the Andean margin. The Central Volcanic Zone (CVZ) between 15°S and 28°S and the Southern Volcanic Zone (SVZ) between 33°S and 46°S are separated by a zone of flat slab subduction and differ significantly in the manifestation of current volcanic activity. The CVZ has been …
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A Second North American Hot-spot: Pleistocene Volcanism in the Anahim Volcanic Belt, west-central British Columbia
… peralkaline magmatism occurred along the Anahim Volcanic Belt (AVB), a 330 km long linear feature in west-central British Columbia. The belt includes three felsic shield volcanoes, the Rainbow, Ilgachuz and Itcha ranges as its most notable features, as well as regionally extensive cone fields, …
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ΣΕΙΣΜΙΚΗ ΤΟΜΟΓΡΑΦΙΑ "ΠΡΟΣΔΙΟΡΙΣΜΟΣ ΖΩΝΩΝ ΤΑΧΥΤΗΤΑΣ ΣΤΟΝ ΕΥΡΥΤΕΡΟ ΕΛΛΗΝΙΚΟ ΧΩΡΟ"
… AT AEGEAN SEA, WHERE LARGE SCALE EXTENSION AND VOLCANIC ACTIVITY ARE PREDOMINANT.
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A GIS-Based Volcanic Hazard and Risk Assessment of Eruptions Sourced within Valles Caldera, New Mexico
… in the United States due to the great amount of volcanic activity over the last 1.61 Ma. Although Valles caldera is currently dormant, there is potential for future volcanic activity, and therefore it is prudent to assess the risk to the surrounding area well before a disaster strikes. The …
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Improving probabilistic hazard forecasts in volcanic fields. Application to Harrat Rahat, Kingdom of Saudi Arabia
Forecasts of future volcanic activity are frequently required for volcanic fields as their relatively low eruption rates and fertile soils draw human populations to live in close proximity to these potentially hazardous regions. Harrat Rahat in the Kingdom of Saudi Arabia is one of these volcanic …
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U-series dating, geochemistry, and geomorphic studies of travertines and springs of the Springerville area, east-central Arizona, and tectonic implications.
… Jemez lineament, a northeast-trending zone of volcanic activity over the last 4.5 Ma. Travertine deposits occur in clusters near the Little Colorado River (LCR) and along fault lineaments overlying the Springerville-St. Johns Dome, a faulted asymmetric anticline trapping a large natural CO2 …
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High-Resolution Inversion and Spectral Decomposition: Case Studies from the Bohaiwan Basin, China
… map the lateral continuity of these reservoirs. Volcanic activity in the Liaohe area resulted in basalt layers with strong reflectivity adjacent to sandstone reservoirs. This makes it difficult to image the reservoir as side lobes of the strong base basalt reflector obscure the reservoir. In …
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INSIGHTS INTO ERUPTION DYNAMICS AND SHALLOW PLUMBING SYSTEM OF MT. ETNA BY INFRASOUND AND SEISMIC SIGNALS
… In multi-vent volcanoes, such as Mt. Etna, where volcanic activity can rapidly vary over time and be simultaneously at the different craters, the shallow plumbing system is quite complex. For forecasting purposes, volcano monitoring measures many geophysical parameters and interprets sub-aerial …
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