seismic Articles

  • Passive Seismic

    Passive seismic exploration methodology, in particular the IPSS/IPDS (Infrasonic Passive Seismic Spectroscopy/ Infrasonic Passive Differential Spectroscopy ) and PST/MST (Passive Seismic Tomography/Micro Seismic Tomography) technique uses spectroscopic and time analysis of the seismic background noise acquired passively using high sensitivity VBB (Very Broad Band) 3D seismometers.  Passive ...

  • Seismic Reflection Method

    Compiled and rigorously edited stacking velocity data to produce velocity maps at specified travel time intervals. These maps were verified to be extremely accurate, enabling exploration staff at AMOCO Production's Alaska North Slope group to make much needed time-depth conversions. Produced time-structure Maps via interpretation of Gulf Coast seismic reflection data while employed with Conoco, ...


    By ECA Geophysics

  • Recognition of karst structure using refraction tomography

    The results of location of karst wells and probable hydraulic connections between them in limestone massif using the refraction tomography are presented. Seismic modeling was based on refraction horizon recognition in the first stage and tomographic processing of P-wave and S-wave velocity changes in the second one. The studies were carried out on the terrain neighboring to the wall of abandoned ...


    By GEOSPECTRUM S.C.

  • Seismic reflection, seismic crosshole and ground penetrating radar case study

    Geophysical Investigation of the Crosstown Expressway. Tampa, FL In April, 2004 Pier 97 which supported an elevated roadway in Tampa, FL was vertically displaced (collapsed) approximately 10 feet (ft). At the time of the collapse it was not known whether the collapse was associated with geological conditions at the site, specifically karst conditions, or whether is was associated with a ...


    By GeoView, Inc.

  • Seismic refraction and MASW case study

    Proposed Gatun Bridge, Colon, Panama The Autoridad del Canal de Panama (ACP) conducted a geotechnical investigation along the footprint of a proposed bridge crossing of the Panama Canal, north of the Gatun Lock. As part of the geotechnical study, GeoView, Spotlight Geophysics and ATI Panamericana were tasked to provide seismic P-wave and S-wave velocity structure of the subsurface. The ...


    By GeoView, Inc.

  • The Basics of Slope Stability Analysis for Geosynthetics

    Slope stability analysis is vital to preventing slope failures in a variety of engineering applications including landfill design, roads, dams and embankments, to name a few. Proper analysis anticipates both natural and manmade slopes and failure of foundations and retaining walls. This blog covers the necessity of slope stability analysis, how to conduct the analysis and the role of ...


    By Agru America, Inc.

  • geological prospecting & seismic device manufacturing industry in China

    China geological prospecting and seismic device manufacturing industry, 2015 is valuable for anyone who wants to invest in the geological prospecting and seismic device manufacturing industry, to get Chinese investments; to import into China or export from China, to build factories and take advantage of lower costs in China, to partner with one of the key Chinese corporations, to get market ...


  • Seismic refraction for weather zone assessment in vibroseismic processing

    Refraction seismic measurements for the determination of the seismic velocities in the shallow subsurface have been performed close to Valence (F) for our partner Partner Gallego Technic Geophysics. 44 profiles with a length of 240m have been acquired in August 2016. Seismic velocities of the shallow geological layers and the bedrock could be determined to a depth of up to 25m. Results from ...


    By Geo2X

  • Seismic Sequence Monitoring in Cephalonia, Greece - Case Study

    Seismic Sequence Monitoring Project Area: Approximately 360km2 Seismic Network: 10 stations Recording Period: #11;43 days Two major earthquakes, ML=5.8/Mw=6.0 and ML=5.7/Mw=5.9 occurred in the island of Cephalonia (western Greece) on the 26 of January 2014 13:55 UTC (15:55 local time) and on the 3rd February 2014 03:08 UTC (05:08 local time), producing ...


    By SeismoTech Ltd

  • Seismic protection of critical infrastructures through innovative technologies

    Development of new technologies for seismic protection will better support the sustainable urban systems. The paper focuses on development of an innovative technology for seismic protection of bridges using smart materials. The seismic protection of structures with the use of special devices is widely accepted as a very effective technique, both for new constructions and for retrofitting of ...


    By Inderscience Publishers

  • Seismic performance of polymer modified concretes in flexure–modelling

    Considerable research has been carried out in the recent years in the development of models to simulate the inelastic responses of reinforced concrete elements. The enhancement of ductility and the post–peak behaviour are of special interest for the seismic design of structures. Polymer modified fibre concretes are found to be ideal for seismic application with its inherent structural ...


    By Inderscience Publishers

  • A slab fragment wedged under Tokyo and its tectonic and seismic implications

    A three-dimensional evaluation of earthquake hypocentres beneath the Kanto basin in Japan reveals the presence of a distinct, 25-km-thick and 100-km-wide body. Its fast seismic velocity and the presence of a double seismic zone suggest that it is a fragment of the Pacific slab, rather than an extension of the ...


    By Nature Publishing Group

  • Passive Seismic Tomography Project in Papua, Indonesia - Case Study

    Passive Seismic Tomography Project Project Area: approximately 1000km2#11; (4700km2 with the peripheral stations) Seismic Network: 80 stations Recording Period: 5 months The scope of this project was the successful completion of a full Passive Seismic Tomography survey in Asmat – Papua, Indonesia, for subsurface mapping purposes and detection ...


    By SeismoTech Ltd

  • Passive Seismic Tomography Project Phase II in Delvina, Albania - Case Study

    Passive Seismic Tomography Project Phase II Project Area: approximately 400km2 Seismic Network: 70 stations Recording Period: 11 months Number of Seismic Events located/used: 1200/1100 The scope of this project, which followed a successful Phase I Passive Seismic Tomography survey, was to provide accurate and reliable 3D P-wave velocity and ...


    By SeismoTech Ltd

  • Nonlinear seismic analysis of RC framed structures equipped with hysteretic damped braces

    The insertion of damped braces proves to be very effective for the seismic retrofitting of framed buildings. In the last few decades several applications have been used in many countries, adopting damping systems with different characteristics, depending on both the arrangement of the damped braces and kind of damping device. However, for a widespread application of this technique, practical ...


    By Inderscience Publishers

  • Passive Seismic Tomography Project Phase I in Assam, India - Case Study

    Passive Seismic Tomography Project Phase I Project Area: approximately 2000km2#11; Seismic Network: 36 stations Recording Period: 3 months Number of Seismic Events located/used: 116/108 The scope of this project was to provide coarse, but reliable 3D P-wave velocity and Vp/Vs models, adequate for a reconnaissance stage mapping of the study ...


    By SeismoTech Ltd

  • Control of seismically excited benchmark highway bridge with variable frequency pendulum isolator

    Earthquake response of benchmark highway bridge, isolated with variable frequency pendulum isolator (VFPI) is investigated under six earthquakes, using a simplified lumped mass finite element model. The isolators are installed between deck–ends and abutments. Seismic response of the bridge with VFPI is compared with that of the bridge with the friction pendulum system (FPS). Parametric studies ...


    By Inderscience Publishers

  • Siting of nuclear desalination plants in Saudi Arabia: a seismic study

    This paper presents the selection criteria generally and seismic criteria specifically to select a suitable site in Saudi Arabia for a nuclear desalination plant. These criteria include geological, meteorological, cooling water supply discharge, transport infrastructure, population, electric grid, water network capacity, environmental impact and airport movement. The seismicity of the Arabian ...


    By Inderscience Publishers

  • Geotechnical Geophysics: Seismic refraction and refraction microtremor (ReMi) surveys

    ReMi Surveys are superior to MASW Surveys in the following ways: Ambient (ie, traffic and aircraft) “noise” is a hindrance to MASW surveys, yet is readily embraced / utilized by “passive” ReMi surveys Longer ReMi data records (ie, 30 seconds vs 8 seconds or less with MASW) capture lower frequency events We introduce high frequency impulsive energy that ...


    By ECA Geophysics

  • Seismic study at the Pacific and Atlantic locks of the panama canal case study

    Panama Canal Zone Grupo Unidos Por el Canal (GUPC) was tasked with characterizing subsurface conditions within the Third Set of Locks Project for the Panama Canal. In support of their characterization efforts, GUPC requested that seismic geophysical data be acquired at four locations within the project area.  These locations include portions of the: Miraflores ...


    By GeoView, Inc.

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