seismic monitoring Articles
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Seismic Sequence Monitoring in Cephalonia, Greece - Case Study
Seismic Sequence Monitoring Project Area: Approximately 360km2 Seismic Network: 10 stations Recording Period: 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 severe damages in the western and central ...
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Comparison of profiling results of attenuation and velocity of refracted P-wave in coal-seam
In the paper the problem of effectiveness of seismic profiling of attenuation and velocity of refracted Pwave in coal-seam along mining excavation in conditions of coal-seam edge impact has been presented. For practical use of seismic attenuation profiling, special measurement and interpretation methodology has been prepared. The measure of calculated attenuation is the value of attenuation ...
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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 SA
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Passive Seismic Tomography Feasibility Study in Aguacate, Mexico - Case Study
Passive Seismic Tomography Feasibility Study Project Area: Approximately 2km2 Seismic Network: 5 stations Recording period: 12 days Seismotech’s personnel installed five seismic stations at the Aguacate hydrocarbon production area in Mexico, aiming to record the seismicity and evaluate the potential microseismic activity on this specific area. Each microseismic station was installed on ...
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Development of comprehensive evaluation procedure for anti-seismic strategies: evaluating Kobe City's earthquake resistance improvement plan from the customer's viewpoint
In Japan, the ‘earthquake-resistant pipe ratio’ and the ‘amount of stored water for emergency’ have been used to evaluate the anti-earthquake performance of water supply facilities. In the past, however, those evaluations were made mainly from the viewpoint of the supplier, and evaluations from the customer's (citizen's) viewpoint have been ...
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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, ...
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Geophysical expression of the Meyers Crater, a new meteorite impact crater discovered in the Coolgardie Goldfield of Western Australia
Summary Detailed airborne electromagnetic (VTEM), gravity and passive seismic HVSR surveying, followed up by RC and diamond drilling, has identified an isolated circular and geologically young meteorite impact crater filled with sediments and located next to the town of Coolgardie in Western Australia. It was discovered in 2017 (Meyers, 2017), is 800 m in diameter and estimated to be >140 m ...
By MoHo s.r.l.
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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 Vp/Vs models, adequate for subsurface mapping of an ...
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Passive Seismic Tomography Project in Papua, Indonesia - Case Study
Passive Seismic Tomography Project Project Area: approximately 1000km2 (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 of possible hydrocarbon indications. In order ...
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Passive Seismic Tomography Project Phase II in Assam, India - Case Study
Passive Seismic Tomography Project Phase II Project Area: approximately 2000km2 Seismic Network: 76 stations Recording Period: 9 months Number of Seismic Events located/used: 276/263 The scope of this project, which followed a successful Phase I Passive Seismic Tomography survey in the same area, was to provide accurate and reliable 3D P-wave velocity and Vp/Vs models, adequate for ...
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Geophysics: Refraction / ReMi surveys at a proposed wind farm
PROJECT: Refraction and ReMi geophysical surveys at a proposed Wind Farm LOCATION: West of Ellensburg, Washington PROJECT DESCRIPTION: Designed and performed seismic refraction / ReMi surveys at 22 proposed Wind Turbine Generator sites for the primary purpose of obtaining shear-wave (Vs) and compressional-wave (Vp) velocities. This information enabled the client (major geotechnical firm) to ...
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Determining the design of Buried foundations case study
Foundation Mapping Determining the three-dimensional design of foundations for telecommunications towers, buildings and road signs can be impractical and sometimes nearly impossible using conventional means. Properly applied geophysical test methods, hand probing and shallow test pits provide a very cost-effective and non-destructive approach to determining the design of foundations. GeoView has ...
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MT & Gravity Survey in Delvina, Albania - Case Study
MT & Gravity Survey In November 2012, SeismoTech s.ltd. was awarded a Gravity and Magnetotelluric survey in the Delvina Area (SW Albania), by Stream Oil & Gas Ltd. The scope of this project was to enrich with additional geophysical information the Delvina Gas field area, in order to conclude on optimum locations for well-drilling. The Delvina Gravity and Magnetotelluric Surveys are part ...
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Passive seismic horizontal to vertical spectral ratio (HVSR) surveying to help define bedrock depth, structure and layering in shallow coal basins
Summary Trial passive seismic HVSR survey lines were carried out in the north-western part of the Wilga sedimentary basin in Western Australia, which is a small and shallow isolated sub-basin to the Perth Basin, sitting above rifted Archaean granite-gneiss basement rocks. The HVSR survey method was trialled to determine if it could resolve subsurface basin features quickly and cheaply. This trial ...
By MoHo s.r.l.
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Passive Seismic Surveying
A new and cost-effective site-assessment tool for the quarrying industry Good quarry design and efficient operation depend upon a ground model that reliably defines the quality, volume and spatial distribution of resource and waste. Most ground models are based on boreholes, sometimes with additional 2D or 3D control provided by ‘traditional’ geophysical surveys such as microgravity, ...
By MoHo s.r.l.
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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 ...
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In-situ stress measurement in concrete - a component for the geolocation of the destruction with earthquakes
So the in-situ stress sensors in the concrete could measure the load changes and stress changes with a building damage after eniem earthquake immediately on-line. The alert with GPS item data is spread world-wide over the Internet. The combination also for everyone accessible maps of the world can facilitate the management after disasters substantially. So fast data are available over destroyed ...
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Update on the geophysical expression of the Abra sedimentary replacement Pb-Ag-Cu-Au deposit, Western Australia
Summary The Abra sedimentary replacement Pb-Ag-Cu-Au deposit is located in the Paleoproterozoic Edmund Basin, 900km NNE of Perth. Mineralisation at Abra has no surface expression and the deposit was discovered in 1981 by drill testing coincident magnetic and gravity anomaly highs. The deposit is hosted within siliciclastic and carbonate deposits of the Edmund Group and consists of a stratabound ...
By MoHo s.r.l.
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A risk–based system for managing the retrofitting of school buildings in seismic prone areas: a case study from Iran
Earthquake events are inevitable but the consequences of earthquake disasters are partially controllable using an effective risk management system. A systematic risk–based method is proposed for assessing the resilience capacities of school buildings exposed to varying levels of seismic risk. This approach screens and monitors the equivalent seismic performance of buildings by the means of new ...
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Railway warning and protected system – Bridge Demolition
So the in-situ stress sensors in the concrete could measure the load changes and stress changes with a building damage after eniem earthquake immediately on-line. The alert with GPS item data is spread world-wide over the Internet. The combination also for everyone accessible maps of the world can facilitate the management after disasters substantially. So fast data are available over destroyed ...
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