نتایج جستجو برای: stratigraphic
تعداد نتایج: 4447 فیلتر نتایج به سال:
Waters and Stafford (Reports, 23 February 2007, p. 1122) provided useful information about the age of some Clovis sites but have not definitively established the temporal span of this cultural complex in the Americas. Only a continuing program of radiometric dating and careful stratigraphic correlations can address the lingering ambiguity about the emergence and spread of Clovis culture.
Determining the timing of paleoearthquakes is a central goal of paleoseismology and serves as an important input to seismic hazard evaluations. Herein, we develop a Bayesian statistical method for refining the ages of strata and earthquakes and calculating the recurrence of earthquakes based on data from paleoseismic excavations. Our work extends previous paleoseismic Bayesian modeling by simul...
The surface of Venus displays several tectonized terrains in which the morphologic characteristics of the original materials are almost completely erased by superposed tectonic structures whose large dimensions (»100 km) suggest formation related to mantle convection. The characteristics of these tectonized terrains are in contrast to volcanic units in which tectonic structures are less signifi...
As a participant of the ONR Shallow Water Acoustics experiment to be held on the outer New Jersey shelf during the summer of 2006 (SWA06), the long term goal of this project is to understand the interaction of acoustic energy, at both medium and low frequencies, with the seabed. OBJECTIVES The objectives of this work are to (1) incorporate existing geological, geophysical and geoacoustic data i...
The term 'tonstein' does not, strictly speaking, imply any particular mode of formation. Much recent work suggests that many tonsteins are the end product of the reworking andlor alteration of volcanic ash lfor example, Price and Duff, 1969; also see paper by Kilby, this volume). Work i s a t present too preliminary to allow genetic classification of the samples from southeast British Columbia ...
The purpose of this study was to identify the formation interfaces from geophysical well log data using the wavelet transform, and a combination of the wavelet transform and the Fourier transform methods. In the wavelet transform method, the identification of formation interfaces is based on the wavelet coefficients from the wavelet transform of spontaneous potential (SP) log and gamma ray (GR)...
oxygen minimum zone dynamic coastal and shelf fronts thermocline tidal mixing runoff high energy turbidity daily–seasonal fluctuations in temperature & salinity ± high productivity halocline shelf break
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