Seismic mapping indicates that Lasuen Knoll offshore southern California is a pop-up structure in a restraining stepover of the Palos Verdes Fault. Dextral shear is apparently transferred southeast through a complex of faults in a linked shear zone to the Carlsbad Ridge and Coronado Bank faults.
Isochore maps of stratigraphic intervals indicate that Miocene extension occurred locally along the Palos Verdes Fault to the south of Lasuen Knoll during the Mohnian stage, and became more widespread during the Delmontian stage. Fanning of dips of Repettian stage strata onlapping Lasuen Knoll indicate that Lasuen Knoll began to form as a pop-up structure by the Early Repettian stage and has continued to uplift to Recent.
Lasuen Knoll is bounded to the north and south along the Palos Verdes-Carlsbad Ridge-Coronado Bank shear zone by transtensional zones. Tectonic models suggest that Lasuen Knoll forms a characteristic California Inner Borderland restraining bend or stepover.
|Advisor:||Francis, Robert D.|
|Commitee:||Behl, Richard J., Kelty, Thomas K.|
|School:||California State University, Long Beach|
|School Location:||United States -- California|
|Source:||MAI 55/02M(E), Masters Abstracts International|
|Subjects:||Geology, Secondary education, Marine Geology|
|Keywords:||California borderland, Earthquake hazards, Seismic, Structural geology, Tectonics|
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