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Geology: Recent submissions
Now showing items 301-320 of 480
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An improved vacuum formulation for 2D finite-difference modeling of Rayleigh waves including surface topography and internal discontinuities
(Society of Exploration Geophysicists, 2012-01)Rayleigh waves are generated along the free surface and their propagation can be strongly influenced by surface topography. Modeling of Rayleigh waves in the near surface in the presence of topography is fundamental to the ... -
Tectonic evolution of the early Mesozoic blueschist-bearing Qiangtang metamorphic belt, central Tibet
(American Geophysical Union, 2003-08-28)A >500-km-long east-west trending metamorphic belt in the Qiangtang terrane of central Tibet consists of tectonic melange that occurs in the footwalls of Late Triassic–Early Jurassic domal low-angle normal faults. The ... -
Conjugate strike-slip faulting along the Bangong-Nujiang suture zone accommodates coeval east-west extension and north-south shortening in the interior of the Tibetan Plateau
(American Geophysical Union, 2003-08-28)Geologic investigations of how the Tibetan plateau is currently deforming have focused primarily on its boundary faults. Consequently, how the interior of the plateau deforms remains poorly understood. To fill this gap in ... -
Kinematic behavior of southern Alaska constrained by westward decreasing postglacial slip rates on the Denali Fault, Alaska
(American Geophysical Union, 2009-03-12)Long-term slip rates for the Denali Fault in southern Alaska are derived using 10Be cosmogenic radionuclide (CRN) dating of offset glacial moraines at two sites. Correction of 10Be CRN model ages for the effect of snow ... -
Current slip rates on conjugate strike-slip faults in central Tibet using synthetic aperture radar interferometry
(American Geophysical Union, 2006-12-09)We estimate the current slip rates on active conjugate strike-slip faults in central Tibet using repeat-pass synthetic aperture radar interferometry (InSAR). The conjugate fault systems are centered along the east trending ... -
Crustal structure of central Lake Baikal: Insights into intracontinental rifting
(American Geophysical Union, 2002-07-16)The Cenozoic rift system of Baikal, located in the interior of the largest continental mass on Earth, is thought to represent a potential analog of the early stage of breakup of supercontinents. We present a detailed P ... -
Challenges for Coring Deep Permafrost on Earth and Mars
(Mary Ann Liebert, 2008-08-04)A scientific drilling expedition to the High Lake region of Nunavut, Canada, was recently completed with the goals of collecting samples and delineating gradients in salinity, gas composition, pH, pe, and microbial abundance ... -
Structure of the southern Keweenawan rift from COCORP surveys across the Midcontinent Geophysical Anomaly in northeastern Kansas
(American Geophysical Union, 1984-06)COCORP profiling across the midcontinent geophysical anomaly in northeastern Kansas reveals structural basins and other features of the Precambrian Keweenawan rift buried beneath the Phanerozoic cover. The 40-km-wide main ... -
Microearthquakes in and near Long Valley, California
(American Geophysical Union, 1976-02-10)Sixteen portable seismograph stations were deployed in the vicinity of the Long Valley geothermal area, California, from April 27 to June 2, 1973. Only minor microearthquake activity was detected in the Long Valley caldera, ... -
Low velocity zone under Long Valley as determined from teleseismic events
(American Geophysical Union, 1976-02-10)A temporary seismograph station network was used to estimate teleseismic P wave residuals in the vicinity of Long Valley geothermal area, California. Relative P wave delays of 0.3 s persist at stations in the west central ... -
Varying the effective mass of geophones
(Society of Exploration Geophysicists, 2001-11)Traditionally, acquiring seismic data has rested on the assumption that geophone mass should be as small as possible. When Steeples and coworkers in 1999 planted 72 geophones automatically and simultaneously with a farm ... -
A review of the fossil record of spiders (Araneae) with special reference to Africa, and description of a new specimen from the Triassic Molteno Formation of South Africa
(Council of the KwaZulu-Natal Museum, 2009-06-01)The fossil record of spiders as currently known is briefly reviewed, with special reference to Africa. The second specimen of Triassaraneus andersonorum Selden in Selden et al. 1999 is described from a different locality ... -
A Triassic spider from Italy
(Polska Akademia Nauk, Instytut Paleobiologii, 2013-01-25)A new fossil spider from the Triassic (Norian) Dolomia di Forni Formation of Friuli, Italy, is described as Friularachne rigoi gen. et sp. nov. This find brings the number of known Triassic spider species to four. The ... -
Multiple Generations of Carbon in the Apex Chert and Implications for Preservation of Microfossils
(Mary Ann Liebert, 2012-02-10)While the Apex chert is one of the most well-studied Archean deposits on Earth, its formation history is still not fully understood. Here, we present Raman spectroscopic data collected on the carbonaceous material (CM) ... -
Engineering cyber infrastructure for U-Pb geochronology: Tripoli and U-Pb_Redux
(American Geophysical Union, 2011-06-24)In the past decade, major advancements in precision and accuracy of U-Pb geochronology, which stem from improved sample pretreatment and refined measurement techniques, have revealed previously unresolvable discrepancies ... -
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Alteration of hyaloclastites in the HSDP 2 Phase 1 Drill Core: 2. Mass balance of the conversion of sideromelane to palagonite and chabazite
(American Geophysical Union, 2003-05-03)[1] The core from the Hawaii Scientific Drilling Project 2 Phase 1 provides a unique opportunity for studying the low-temperature alteration processes affecting basalt in suboceanic-island environments. In hyaloclastites, ... -
Nomad rover field experiment, Atacama desert, Chile 2. Identification of paleolife evidence using a robotic vehicle: Lessons and recommendations for a Mars sample return mission
(American Geophysical Union, 2001-04-25)During the Nomad Rover Field Experiment in the Atacama Desert (Chile), a potential fossil was identified in a boulder by the science team remotely located at NASA Ames Research Center, California. The science team requested ... -
Diagenesis of Middle Tertiary carbonates in the Toa Baja Well, Puerto Rico
(American Geophysical Union, 1991-03-01)The Toa Baja Well drilled in northern Puerto Rico to adepth of 2705 m (8872 ft.) penetrated over 550 m (1800 ft.) of Tertiary carbonates. The limestone-dominated portion of the well consists mostly of shallow-water backreef ... -
Carbon and oxygen stable isotopes in the Toa Baja Well, Puerto Rico: implications for burial diagenesis and hydrocarbon generation
(Geophysical Research Letters, 1991-03-01)The Toa Baja Well was drilled on the coastal plains of northern Puerto Rico with a total depth of 2705 m [Larue, 1990]. Interstratified limestone, quartz-bearing calcareous sandstones, and shales dominate the uppermost 580 ...