| An Analysis of Seismic Activity from Redoubt Volcano, AK Using the Hilbert-Huang Transformation | Current | Recent seismic activity from the Redoubt Volcano has led seismologists to predict an imminent eruption. These predictions are generally based on the magnitude and frequency of the seismic activity, along with knowledge of the physical behavior from past eruptions. We propose a more complete analysis of the seismic data using the Hilbert-Huang transformation, a new signal processing technique developed by NASA Goddard Space Flight Center. This technique will allow us to examine the magnitude and frequency components of the seismic signal at any instant in time. Results from this technique will be compared to those obtained using Fourier and Wavelet transformations, two commonly used methods for examining the frequency content of a signal. We will also use a sort of ground-truthing by reviewing the physical volcanic activity that corresponds to the most apparent seismic events that exist in the seismic data set. By comparing current and past seismic data using the Hilbert-Huang transformation and utilizing the physical volcanic activity record, we hope to develop a tool to better predict when an actual eruption may occur. |
| Combining Geophysics and Geochemistry to Understand the Ammalous Accurence of Permafrost in Anchorage Alaska | Completed | Permafrost is a significant feature in the arctic and sub-arctic environments of Alaska. The occurrence and vulnerability of permafrost to change in climate (i.e. warming trends) is of particular interest from an engineering standpoint. For example, roads, pipelines and other structures can be adversely effected by changes in permafrost extent. An unexpected lens of permafrost has been encountered by the Alaska Railroad Association in Eagle River near Chugiak High School. The climate in South Central Alaska is generally too warm for permafrost to exist, particularly at lower elevations. The discovery of this particular lens of permafrost is the motivation for my research. The goal of my proposed study is to better map the extent and age of this lens. A combination of geophysical and geochemical techniques will be implemented to achieve this goal. In addition, by assessing physical characteristics of the environment, including topography, vegetation, and solar radiation, we hope to develop a predictive model for permafrost occurrence in Southcentral Alaska. |
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