نتایج جستجو برای: stack seismic data at north

تعداد نتایج: 5397796  

2014
Robert J. Geller

2. Summary The Earth consists of the crust, mantle (Note #1), outer core and inner core (Note #2). The D" (pronounced “Dee double prime”) layer is the name given to the lowermost several hundred km of the mantle, directly below which is the molten outer core, which is composed primarily of iron. The temperature and chemical composition within D" vary rapidly as the distance to the core-mantle b...

Journal: :Geochemistry Geophysics Geosystems 2022

We obtained a 3D image of crust and mantle seismic velocity gradients beneath the state Alaska using common-conversion point (CCP) stacking S-to-p converted body waves recorded by hundreds stations from NSF EarthScope Transportable Array other portable arrays permanent networks. Moho depths delineate thick underthrust Yakutat terrane crustal root Brooks Range. The North American lithosphere is ...

2000
Paul Sava Sergey Fomel

In this paper, we present a method for computing angle-domain common-image gathers from wave-equation depth-migrated seismic images. We show that the method amounts to a radial-trace transform in the Fourier domain and that it is equivalent to a slant stack in the space domain. We obtain the angle-gathers using a stretch technique that enables us to impose smoothness through regularization. Sev...

Journal: :NRIAG Journal of Astronomy and Geophysics 2023

Reprocessing of seismic reflection data over Nader field in the Egyptian Western Desert, improved images surface structural framework. The appearance can be affected by various factors apart from subsurface structure, including acquisition problems and processing artefacts. Different post-stack steps were tested compared to original determine enhancement quality improvements on imaging subsurfa...

Journal: :پژوهش های جغرافیای طبیعی 0
قاسم عزیزی دانشیار دانشکدة جغرافیا، دانشگاه تهران مرتضی میری دانشجوی دکتری اقلیم شناسی، دانشکدة جغرافیا، دانشگاه تهران مجتبی رحیمی دانشجوی دکتری اقلیم شناسی، دانشکدة جغرافیا، دانشگاه تهران

introduction climate is a system consisting of atmosphere, lithosphere, cryosphere, hydrosphere, and biosphere. this system is involved in the exchange of energy and moisture among these five components. the exchanges link the atmosphere as the central component of the climate to other spheres. changes do not occur separately in this system; rather change in one component contributes to reactio...

2014
Hongyi Li Yang Shen Zhongxian Huang Xinfu Li Meng Gong Danian Shi Aibing Li

We collected continuous seismic data recorded between 2007 and 2010 by 208 broadband stations from the Chinese Provincial Digital Seismic Networks, A Seismic Collaborative Experiment of Northern Tibet, and the Northeastern Tibet Seismic experiment. Cross correlations of vertical component records are computed to extract the Rayleigh wave empirical Green’s functions. Group and phase velocities a...

2018
Jennifer Ward Neale Nicholas Harmon

Using array analysis, the direction and distance to a seismic P wave source can be determined. However, individual arrays are limited in their geographical coverage and by their resolving capability, which is determined by the array aperture, configuration, and number of stations. We demonstrate these limitations on three large seismic arrays located in Japan, Europe, and California, and find t...

2001
Jef Caers Tapan Mukerji

Turbidite systems are complex heterogeneous siliciclastic deposits calling for a new approach to geophysical and geostatistical reservoir characterization. The aim of this paper is to demonstrate the integration of seismic amplitude and rock physics data into realistic geological scenarios using a novel geostatistical approach. Avseth (2000, 2001 with others) presented an integrated rock physic...

2008
William C. Hammond Geoffrey Blewitt Corné Kreemer Jessica R. Murray-Moraleda Jerry L. Svarc

Using Global Positioning System (GPS) data from permanent sites and U.S. Geological Survey (USGS) campaign data we have estimated co-seismic displacements and secular background crustal deformation patterns associated with the 21 February 2008 Wells Nevada earthquake. Estimated displacements at nearby permanent GPS sites ELKO (84 km distant) and GOSH (81 km distant) are 1.0±0.2 mm and 1.1±0.3 m...

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