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- Costa Rica (1)
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Articles 1 - 12 of 12
Full-Text Articles in Physical Sciences and Mathematics
City Of Tampa Urban Forest Management Plan, Robert J. Northrop, Kathy Beck, Rob Irving, Shawn M. Landry, Michael G. Andreu
City Of Tampa Urban Forest Management Plan, Robert J. Northrop, Kathy Beck, Rob Irving, Shawn M. Landry, Michael G. Andreu
School of Geosciences Faculty and Staff Publications
No abstract provided.
The 5 September 2012 Nicoya, Costa Rica Mw 7.6 Earthquake Rupture Process From Joint Inversion Of High‐Rate Gps, Strong‐Motion, And Teleseismic P Wave Data And Its Relationship To Adjacent Plate Boundary Interface Properties, Han Yue, Thorne Lay, Susan Y. Schwartz, Luis Rivera, Marino Protti, Timothy H. Dixon, Susan Owen, Andrew V. Newman
The 5 September 2012 Nicoya, Costa Rica Mw 7.6 Earthquake Rupture Process From Joint Inversion Of High‐Rate Gps, Strong‐Motion, And Teleseismic P Wave Data And Its Relationship To Adjacent Plate Boundary Interface Properties, Han Yue, Thorne Lay, Susan Y. Schwartz, Luis Rivera, Marino Protti, Timothy H. Dixon, Susan Owen, Andrew V. Newman
School of Geosciences Faculty and Staff Publications
On 5 September 2012, a large thrust earthquake (Mw 7.6) ruptured a densely instrumented seismic gap on the shallow‐dipping plate boundary beneath the Nicoya Peninsula, Costa Rica. Ground motion recordings directly above the rupture zone provide a unique opportunity to study the detailed source process of a large shallow megathrust earthquake using very nearby land observations. Hypocenter relocation using local seismic network data indicates that the event initiated with small emergent seismic waves from a hypocenter ~10 km offshore, 13 km deep on the megathrust. A joint finite‐fault inversion using high‐rate GPS, strong‐motion ground velocity recordings, GPS static offsets, …
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 …
City Of Tampa 2011 Urban Forest Analysis: The Structure, Composition, Function And Economic Benefits Of Trees And The Urban Forest, Shawn M. Landry, Robert J. Northrop, Madison Andreu, Carolyn Cheatham Rhodes
City Of Tampa 2011 Urban Forest Analysis: The Structure, Composition, Function And Economic Benefits Of Trees And The Urban Forest, Shawn M. Landry, Robert J. Northrop, Madison Andreu, Carolyn Cheatham Rhodes
School of Geosciences Faculty and Staff Publications
No abstract provided.
Initial Morphologic Evolution Of Perdido Key Berm Nourishment, Florida, Ping Wang, Katherine E. Brutsche, Tanya M. Beck, Julie D. Rosati, Linda S. Lillycrop
Initial Morphologic Evolution Of Perdido Key Berm Nourishment, Florida, Ping Wang, Katherine E. Brutsche, Tanya M. Beck, Julie D. Rosati, Linda S. Lillycrop
School of Geosciences Faculty and Staff Publications
This Coastal and Hydraulics Engineering Technical Note (CHETN) documents the initial morphologic evolution of the Perdido Key, FL, swash-zone berm based on beach-nearshore profile, sediment samples, and nearshore wave data collected during the first six months after berm construction. The US Army Corps of Engineers (USACE), Mobile District, dredged the navigation channel at Pensacola Pass, FL, from November 2011 to January 2012 and placed the 520,000 cubic yards (yd3) of dredged sand as a swash-zone berm nearshore of Perdido Key, FL. Beach quality sands are a valuable resource within the coastal zone in maintaining regional sediment balance. Compared to a …
Performance Monitoring Of A Nearshore Berm At Ft. Myers Beach, Florida: Final Report, Ping Wang, Katherine E. Brutsche, James W. Lagrone, Tanya M. Beck, Julie D. Rosati, Linda S. Lillycrop
Performance Monitoring Of A Nearshore Berm At Ft. Myers Beach, Florida: Final Report, Ping Wang, Katherine E. Brutsche, James W. Lagrone, Tanya M. Beck, Julie D. Rosati, Linda S. Lillycrop
School of Geosciences Faculty and Staff Publications
This report documents the placement and monitoring of an active nearshore berm at Ft. Myers Beach, Florida. From May to July 2009, mixed sand and finer sediment dredged from a nearby inlet were placed in the active littoral zone in the form of a bar-shaped nearshore berm. Six sets of beach-nearshore profile surveys and two periods of sediment sampling along profiles were collected. The Ft. Myers Beach nearshore berm migrated onshore roughly 300 ft during the first 2 years. The elevation of the berm crest increased up to 2 ft. Nearly half of the onshore migration occurred during the first …
Distinct Iron Isotopic Signatures And Supply From Marine Sediment Dissolution, William B. Homoky, Seth G. John, Tim M. Conway, Rachel A. Mills
Distinct Iron Isotopic Signatures And Supply From Marine Sediment Dissolution, William B. Homoky, Seth G. John, Tim M. Conway, Rachel A. Mills
School of Geosciences Faculty and Staff Publications
Oceanic iron inputs must be traced and quantified to learn how they affect primary productivity and climate. Chemical reduction of iron in continental margin sediments provides a substantial dissolved flux to the oceans, which is isotopically lighter than the crust, and so may be distinguished in seawater from other sources, such as wind-blown dust. However, heavy iron isotopes measured in seawater have recently led to the proposition of another source of dissolved iron from ‘non-reductive’ dissolution of continental margins. Here we present the first pore water iron isotope data from a passive-tectonic and semi-arid ocean margin (South Africa), which reveals …
Evidence For Reactive Reduced Phosphorus Species In The Early Archean Ocean, Matthew A. Pasek, Jelte P. Hammeijer, Roger Buick, Maheen Gull, Zachary D. Atlas
Evidence For Reactive Reduced Phosphorus Species In The Early Archean Ocean, Matthew A. Pasek, Jelte P. Hammeijer, Roger Buick, Maheen Gull, Zachary D. Atlas
School of Geosciences Faculty and Staff Publications
It has been hypothesized that before the emergence of modern DNA–RNA–protein life, biology evolved from an “RNA world.” However, synthesizing RNA and other organophosphates under plausible early Earth conditions has proved difficult, with the incorporation of phosphorus (P) causing a particular problem because phosphate, where most environmental P resides, is relatively insoluble and unreactive. Recently, it has been proposed that during the Hadean–Archean heavy bombardment by extraterrestrial impactors, meteorites would have provided reactive P in the form of the iron–nickel phosphide mineral schreibersite. This reacts in water, releasing soluble and reactive reduced P species, such as phosphite, that could then …
Annual Variation Of Coastal Uplift In Greenland As An Indicator Of Variable And Accelerating Ice Mass Loss, Qian Yang, Shimon Wdowinski, Timothy H. Dixon
Annual Variation Of Coastal Uplift In Greenland As An Indicator Of Variable And Accelerating Ice Mass Loss, Qian Yang, Shimon Wdowinski, Timothy H. Dixon
School of Geosciences Faculty and Staff Publications
Seasonal melting of the coastal part of the Greenland ice sheet is investigated using GPS vertical displacement data from coastal stations, combined with data on atmospheric and ocean temperatures. Using a high pass filter and cubic spline models, we estimate five variables describing seasonal uplift, a proxy for proximal mass loss, including duration of the melt season and the amount of summer uplift. Our analysis shows both temporal and spatial variations of uplift. Southern coastal Greenland experienced anomalously large uplift in summer 2010, implying significant melting that year. However, the northwest coast did not experience significant change in uplift at …
How Rigid Is A Rigid Plate? Geodetic Constraint From The Trignet Cgps Network, South Africa, Rocco Malservisi, Urs Hugentobler, Richard Wonnacott, Matthias Hackl
How Rigid Is A Rigid Plate? Geodetic Constraint From The Trignet Cgps Network, South Africa, Rocco Malservisi, Urs Hugentobler, Richard Wonnacott, Matthias Hackl
School of Geosciences Faculty and Staff Publications
Rigidity and continuity of the Nubia plate is a fundamental assumption for the kinematic description, the dynamic implications of its interaction with surrounding plates and ultimately an important constraint to the geodynamics processes involved in continental lithospheric rupture. Geophysical, neotectonic and geodynamics considerations suggest the possibility that the Nubia plate is not completely rigid but could be undergoing internal deformation due to the southward propagation of the East African Rift. Here, we utilize the South African TrigNet geodetic network to evaluate the amount of internal deformation within the South African region and the possibility of motion between South Africa and …
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.
Evolution Of Guano Under Different Environmental Conditions: A Mineralogical Approach, Alexandra M. Giurgiu, Bogdan P. Onac, Tudor Tămaș, Joan J. Fornos
Evolution Of Guano Under Different Environmental Conditions: A Mineralogical Approach, Alexandra M. Giurgiu, Bogdan P. Onac, Tudor Tămaș, Joan J. Fornos
School of Geosciences Faculty and Staff Publications
The phosphate minerals from three Romanian caves that host bat guano deposits have been investigated. The XRD and SEM analyses have revealed the presence of seven phosphates (brushite, francoanellite, hydroxylapatite, leucophosphite, taranakite, vashegyite and variscite) along with the more common gypsum, calcite and various allochthonous clay minerals. The occurrence of these phosphate minerals highlights the decomposition and various reactions that take place between the phosphate-rich solutions leaching out from the guano and different cave sediments and/or bedrock. The variation of the environmental conditions in the vicinity and within the guano accumulations is responsible for the type of mineral that is …