Paleomagnetic Constraints on Late Quaternary Crustal Fragmentation in the Area of the 1994 Northridge Earthquake

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9416324 Levi This study will examine the paleomagnetism of continentally-derived, late Quaternary, Saugus Formation sedimentary rocks in the San Fernando Valley and east Ventura Basin in order to delineate the boundaries of rotated crustal blocks. Preliminary work has roughly delineated the boundaries of rotated versus non-rotated blocks in the area, and has shown that crustal segmentation and vertical axis rotations continue to the present. This work will define the block boundaries more precisely and relate them to mapped faults or other tectonic features. The results will enable more precise determination of the strike-slip versus dip-slip components of movement in response to the tectonic stresses and may provide a practical limit on thrust-fault earthquake magnitudes in the Los Angeles Basin area.