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Full-Text Articles in Physical Sciences and Mathematics
Cycle Symmetry And Its Causes, Cisco Group (Virgilian And Wolfcampian), Texas, Wan Yang
Cycle Symmetry And Its Causes, Cisco Group (Virgilian And Wolfcampian), Texas, Wan Yang
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
181 transgressive-regressive cycles composed of nonmarine and marine carbonate and siliciclastic rocks of the Cisco Group on the Eastern Shelf, Texas, display complex characteristics at both hemicycle and full-cycle scales. They are delineated on the basis of successive changes of depositional environments, stratal boundary relations, and stratigraphic position. Transgressive and regressive stratigraphic environment gradients are defined as the magnitude of environmental shift divided by thickness for each hemicycle. They indicate the rates of lateral environmental shifts during transgression and regression. Cycle symmetry index is defined as the ratio between transgressive and regressive stratigraphic environment gradients. It provides a measure of …
Localized Amplification Of Seismic Waves And Correlation With Damage Due To The Northridge Earthquake: Evidence For Focusing In Santa Monica, Stephen S. Gao, Kelly H. Liu, Paul M. Davis, Leon Knopoff
Localized Amplification Of Seismic Waves And Correlation With Damage Due To The Northridge Earthquake: Evidence For Focusing In Santa Monica, Stephen S. Gao, Kelly H. Liu, Paul M. Davis, Leon Knopoff
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
The analysis of seismograms from 32 aftershocks recorded by 98 seismic stations installed after the Northridge earthquake in the San Fernando Valley, the Santa Monica Mountains, and Santa Monica, California, indicates that the enhanced damage in Santa Monica is explained in the main by focusing due to a lens structure at a depth of several kilometers beneath the surface and having a finite lateral extent. The diagnosis was made from the observation of late-arriving S phases with large amplitudes, localized in the zones of large damage. The azimuths and angles of incidence of the seismic rays that give rise to …
Data Report For The 1993 Los Angeles Region Seismic Experiment (Larse93), Southern California: A Passive Study From Seal Beach Northeastward Through The Mojave Desert, Monica D. Kohler, Paul M. Davis, Kelly H. Liu, Mark Benthien, Stephen S. Gao, Gary S. Fuis, Robert W. Clayton, David Okaya, James Mori
Data Report For The 1993 Los Angeles Region Seismic Experiment (Larse93), Southern California: A Passive Study From Seal Beach Northeastward Through The Mojave Desert, Monica D. Kohler, Paul M. Davis, Kelly H. Liu, Mark Benthien, Stephen S. Gao, Gary S. Fuis, Robert W. Clayton, David Okaya, James Mori
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
This report contains a description of the first part of the Los Angeles Region Seismic Experiment (LARSE). To date, LARSE has consisted of two experiments: passive, which took place in fall, 1993 (LARSE93), and active, which took place in fall, 1994 (LARSE94). The goal of the 1993 experiment was to collect waveform data from local and distant earthquakes to obtain three-dimensional images of lower crust and upper mantle structure in Southern California, particularly under the San Gabriel Mountains and across the San Andreas fault. During LARSE93, approximately 88 stations were deployed in a 175-km-long, linear array across the Los Angeles …