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Characterization Of Glacial Sediments From A 700,000-Year-Old Lake Junín Drill Core, Tshering Lama Sherpa
Characterization Of Glacial Sediments From A 700,000-Year-Old Lake Junín Drill Core, Tshering Lama Sherpa
Honors Theses
Lake Junín (11.0°S, 76.2°W) is an intermontane lake at an elevation of 4085 masl in Junín, Peru. The lake spans ~300 km2 and has a water depth of ~12m. It is dammed at its northern and southern ends by glacial alluvial fans that have been dated >250 ka, indicating that the lake is at least this old. Lake Junín has never been overridden by ice in the past 1 million years making it one of the few lakes in the tropical Andes that predates the last maximum extent of glaciation and has a continuous record of waxing and waning of …
Mapping Bedrock Topography Of The Portage And Schoolcraft Nw 7.5’ Quadrangles, Kalamazoo Co. Mi, Using The Hvsr Passive Seismic Method, Benjamin B. Seiderman
Mapping Bedrock Topography Of The Portage And Schoolcraft Nw 7.5’ Quadrangles, Kalamazoo Co. Mi, Using The Hvsr Passive Seismic Method, Benjamin B. Seiderman
Masters Theses
This study utilizes the Horizontal to Vertical Spectral Ratio (HVSR) technique to map bedrock topography in the Portage and Schoolcraft NW quadrangles, Kalamazoo Co., MI, looking for buried bedrock valleys. Glacial sediment-landform assemblages dominate the study area, due to multiple advances of the Laurentide Ice Sheet (LIS). Tunnel valleys, which are one type of buried valley, are eroded by subglacial meltwater and commonly filled with the coarser varieties of glacial outwash, making them potential aquifers. The HVSR technique measures the ratio of horizontal to vertical ground motion, excited by ambient seismic noise, resulting in a peak at the resonance frequency. …