Icequake
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Icequake
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Author : Crawford Kilian
language : en
Publisher: iUniverse
Release Date : 1998
Icequake written by Crawford Kilian and has been published by iUniverse this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Fiction categories.
A ground-breaking page turner in the realm of speculative science fiction by Crawford Kilian. When the world climate changes overnight, when thirteen million cubic kilometers of icecap slide into the sea, when famine and flood break down civil order, the survivors at the remote New Shackleton Station on the Antarctic icecap know that rescue is impossible.
Icequake
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Author : Crawford Kilian
language : en
Publisher:
Release Date : 1979
Icequake written by Crawford Kilian and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Ice categories.
Novel in which a group of Antarctic researchers are set adrift on an ice floe following an earthquake under Antarctica.
Sos Adventure Icequake
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Author : Colin Bateman
language : en
Publisher: Hachette UK
Release Date : 2011-03-03
Sos Adventure Icequake written by Colin Bateman and has been published by Hachette UK this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-03-03 with Juvenile Fiction categories.
Baring Island, the Canadian Arctic. Michael and Katya are alone, in the middle of a blizzard. There are wolves snapping at their heels, and somewhere ahead of them, a gigantic polar bear with the taste for human blood. They've come with the SOS team in search of a missing satellite, but now they're just struggling to stay alive.
Ice Quake
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Author : John R. Spencer
language : en
Publisher: Commonwealth Publications Incorporated
Release Date : 1997-01-01
Ice Quake written by John R. Spencer and has been published by Commonwealth Publications Incorporated this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997-01-01 with Natural disasters categories.
Icequake
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Author : Richard Moran
language : en
Publisher: McNally & Loftin Publishers
Release Date : 1924-12-01
Icequake written by Richard Moran and has been published by McNally & Loftin Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 1924-12-01 with Fiction categories.
Icequake Seismology
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Author : Kendal Gerard Neave
language : en
Publisher:
Release Date : 1971
Icequake Seismology written by Kendal Gerard Neave and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with Athabasca Glacier (Alta.) categories.
Icequake
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Author : Colin Bateman
language : en
Publisher:
Release Date : 2010
Icequake written by Colin Bateman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Adventure stories categories.
Baring Island, the Canadian Arctic. Michael and Katya are alone, in the middle of a blizzard. There are wolves snapping at their heels, and somewhere ahead of them, a gigantic polar bear with the taste for human blood. They've come with the SOS team in search of a missing satellite, but now they're just struggling to stay alive.
Ice Tectonics And Icequake Occurrence On Green Bay Wisconsin
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Author : Samuel Yellin
language : en
Publisher:
Release Date : 1979
Ice Tectonics And Icequake Occurrence On Green Bay Wisconsin written by Samuel Yellin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Ice on rivers, lakes, etc categories.
Melt Triggered Seismic Response In Hydraulically Active Polar Ice
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Author : Joshua D. Carmichael
language : en
Publisher:
Release Date : 2013
Melt Triggered Seismic Response In Hydraulically Active Polar Ice written by Joshua D. Carmichael and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Glaciology categories.
Glacier ice responds to environmental forcing through changes in its sliding speed and mass balance. While these changes often occur on daily time scales or longer, they are initiated by brittle deformation events that establish hydrological pathways in hours or seconds and allow meltwater access to englacial or subglacial depths to facilitate ice motion. In this thesis, we (various contributing authors including myself) use seismic monitoring to detect and locate the creation and growth of some of these hydraulic pathways by monitoring their seismic emissions, or icequakes. More specifically, we address (1) what seismic observables, unavailable from other sensing methods, indicate an initial glaciogenic response to melt- water input and (2) if these comprise evidence of feedbacks that may destabilize polar ice under a warming climate. Supplemental to our scientific contributions, we advance statistical processing methods that demonstrably improve the capability of digital detectors at discriminating icequakes from astationary noise. We begin by interpreting geophysical observations collected from a dry-based, sub-freezing (-17° C), polar glacier environment (Taylor Glacier, ANT). By implementing a calibrated surface energy balance model, we estimate the timing and volume of surface meltwater generated during the collection of seismic data from a six-receiver geophone network. This comparison illustrated that any effectively nonzero meltwater triggered large, repeating icequakes localized near a deep, supraglacial-to-subglacial crack within a melt-water catchment region. The focal mechanisms of these icequakes are consistent with an expansive growth within the crack. Their occurrence at night suggests that this expansion was accommodated by volumetric straining of confined, re-freezing meltwater. These cracks likely sustained their surface-to-bed hydrological connection, in the absence of melt-assisted basal sliding. Further, this appears to be the first report attributing seismogensis in glacial ice to fracturing induced by phase change. We proceed by contrasting these response characteristics with geophysical observations following an early (spring) supraglacial lake drainage within the lake-forming ablation zone of the Western Greenland Ice Sheet. The subglacial drainage system present during this time was considered incapable of efficiently draining large fluxes of meltwater input and therefore likely to undergo transient motion. Using measurements from a ~5km-aperture geophone network, we find that the anticipated post-drainage icequakes are diurnally responsive, largely surficial in origin, and indicative of tensile fracturing from shallow cracks in the ice. The creation of the lake-drainage moulin appears to coincide with a shift in mean icequake source locations, and an increase in icequake occurrence at night relative to that in the day. Contrary to our expectations, we find that the timing of GPS-derived surface speeds do not clearly indicate this seismic activity on any given day. Rather, these icequakes are best explained by peaks in localized strain gradients that develop at night when decreased subglacial water flux likely increases variability in basal traction. Additionally, our results appear comprise the first detailed seismic observations targeted at an actively draining lake. Our last study addresses the apparent deficiency in observed basal icequakes detected from Greenland lake site. To explain the lack of deep icequakes, we compute thresholds on the magnitude of detectable basal events within the network and thereby illustrate that surficial icequakes with similar magnitudes and spectral content are more likely to be observed. By restricting our attention to seismic events that produce lower frequency waveforms, we find a population of nearly monochromatic, sub-1Hz, large magnitude ( M[subscript w] [less than or equal to] 3) seismic events borne from remote glaciogenic sources. In contrast to surficial icequakes, these events occur without significant bias between day and/or night periods and are best explained as glacial earthquakes generated by sliding episodes or iceberg calving events in the vicinity of Jakobshavn Glacier. These events occur daily and not correlate with the presence of local, surficial seismicity. We conclude with three general assertions regarding melt-triggered response characteristics of polar ice. First, hydraulic connections established by fracture events do not necessarily result in seismogenic basal stick slip, and therefore cannot necessarily be observed with conventional GPS monitoring. This was demonstrated at Taylor Glacier. Here, meltwater input to a hydraulic pathway led to fracture growth deep within a cold glacier without any change in surface speed. Second, the presence of melt-triggered basal sliding does not necessarily induce a clear seismogenic basal response in the lakes regions. This was demonstrated on the Greenland Ice Sheet. Seismogenesis may instead be more clearly reflected by surficial strain gradients established by variability in basal traction, suggesting these feedbacks are secondary rather than primary. The response is therefore not clearly indicated from day-to-day timing of GPS-observations. Third, the absence of an observed local response does not necessarily indicate the absence of a local physical response. This was also illustrated in Greenland. Here, deep local icequakes are likely muted by noise, waveform-attenuating ice, and viscous basal rheology. Magnitude thresholds suggest that M[subscript w][less than or equal] 2 for consistent recording of local, basal sources. In contrast, remote, low frequency seismic events were clearly observed, and attributed to activity within ice catchments along the western edge of the ice sheet or Jacobshavn glacier. Finally, we assert that early-indicators of melt-triggered glacial response include components of spatially localized, brittle deformation that is most suitable to seismic observation. Critically-stable regions along mass-balance equilibrium lines constitute potential sites for newly forming surface-to-bed hydraulic connections in a warming climate, and likewise, a potential target for future seismic experiments.
Seismic Events In Glaciers
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Author : Marek Górski
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-09-20
Seismic Events In Glaciers written by Marek Górski and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-09-20 with Science categories.
The occurrence of seismic events in glaciers has been an issue in the scientific literature since the early 1950s, following the report about icequakes in Baffin Island. Targeted seismological studies were undertaken by the Polish Expedition to Spitsbergen in 1962 and then continued at various glaciers in the Arctic, Antarctic and the Alps. The author of the book has been engaged in the project since 1970; he designed the layout of observations and instrumentation. The quakes he observed were categorized into two groups: typical seismic events called icequakes, and relatively long-period events named ice vibrations. In the case of icequakes, the space-time distributions and focal parameters were determined. In the case of ice vibrations, a spectral analysis was made. The present book is a synthesis of the results obtained. There are reports that the number of seismic events in glaciers has recently grown, which may be related to changing geometry of glaciers due to changing thermal conditions.