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Full-Text Articles in Physical Sciences and Mathematics
Insights Into Distributed Plate Rates Across The Walker Lane From Gps Geodesy, Zachery M. Lifton, Andrew V. Newman, Kurt L. Frankel, Christopher W. Johnson, Timothy H. Dixon
Insights Into Distributed Plate Rates Across The Walker Lane From Gps Geodesy, Zachery M. Lifton, Andrew V. Newman, Kurt L. Frankel, Christopher W. Johnson, Timothy H. Dixon
School of Geosciences Faculty and Staff Publications
Contemporary geodetic slip rates are observed to be approximately two times greater than late Pleistocene geologic slip rates across the southern Walker Lane. Using a dense GPS network, we compare the present‐day crustal velocities to observed geologic slip rates in the region. We find that the Walker Lane is characterized by a smooth transition from westward extension in the Basin and Range to northwestward motion of the Sierra Nevada block. The GPS velocity field indicates that (1) plate parallel (N37°W) velocities define a velocity differential of 10.6 ± 0.5 mm/yr between the western Basin and Range and the Sierra Nevada …
Detailed Data Available For Recent Costa Rica Earthquake, Timothy H. Dixon, Susan Schwartz, Marino Protti, Victor Gonzalez, Andrew Newman, Jeff Marshall, Jim Spotila
Detailed Data Available For Recent Costa Rica Earthquake, Timothy H. Dixon, Susan Schwartz, Marino Protti, Victor Gonzalez, Andrew Newman, Jeff Marshall, Jim Spotila
School of Geosciences Faculty and Staff Publications
On 5 September 2012 a magnitude 7.6 earthquake occurred beneath the Nicoya Peninsula of northwestern Costa Rica, rupturing the subduction zone between the Cocos and Caribbean plates. In most subduction zones the locus of seismic slip lies far offshore, making it difficult to infer interface seismogenic processes from on-shore observations. In contrast, the Nicoya Peninsula lies close to the trench (within 70 kilometers), allowing observations directly over the earthquake rupture zone.