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Accuracy and precision of microseismic event locations in rock burst studies

Accuracy and precision of microseismic event locations in rock burst studies

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  • 16 Currently reading

Published by U.S. Dept. of the Interior, Bureau of Mines in Washington, D.C .
Written in English

    Subjects:
  • Rock bursts.,
  • Microseisms.

  • Edition Notes

    Includes bibliographical references (p. 31-32).

    Statementby P.L. Swanson ... [et al.].
    SeriesReport of investigations ;, 9395, Report of investigations (United States. Bureau of Mines) ;, 9395.
    ContributionsSwanson, P. L.
    Classifications
    LC ClassificationsTN23 .U43, TN317 .U43
    The Physical Object
    Paginationii, 40 p. :
    Number of Pages40
    ID Numbers
    Open LibraryOL1544275M
    LC Control Number91023343

    emitted that is captured by microseismic monitoring to locate the source event in time and space, and to extract other in-formation about the way the rock broke and the stresses that caused the breakage. There are two prevailing methods for locating the source of a microseismic event. The first is an adaptation of the way government agencies. Influence of a velocity model and source frequency on microseismic waveforms: some implications for microseismic locations P.J. Usher,1,3 D.A. Angus2,3∗ and J.P. Verdon1 1Department of Earth Sciences, University of Bristol, Bristol, UK, 2CiPEG, University of Leeds, Leeds, UK, and 3School of Earth & Environment, University of Leeds, Leeds, UK.

    Microseismic event location provides a plethora of information about underground processes such as hydraulic fracturing, steam injection or mining and volcano activities. Nevertheless, accuracy is limited by acquisition geometry and errors in the velocity model and time picks. Combining a relative location method and seismic interferometric imaging, a relative elastic interferometric imaging method for microseismic source location is proposed. In the method, the information of a known event (the main event) is fully used to improve the location precision of the unknown events (the target events).

    Microseismic interpretation is the monitoring of small scale microseismic signals made from either natural or man made tremors. Most widely used to estimate stimulated reservoir volumes and in identifying major fault or fracture events for use in hydrocarbon exploration. Microseismic monitoring is the passive observation of very small-scale earthquakes which occur in the ground as a result of human activities or industrial processes such as mining, hydraulic fracturing, enhanced oil recovery, geothermal operations or underground gas storage. Microseismic science grew out of earthquake seismology and focuses on micro-earthquakes (i.e. magnitude.


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Accuracy and precision of microseismic event locations in rock burst studies Download PDF EPUB FB2

Accuracy and Precision of Microseismic Event Locations in Rock Burst Research Studies By P. Swanson, L H, Estey, F. Boler, and S. Billington UNITED STATES DEPARTMENT OF THE INTERIOR or OF BUREAU OF MINES.

be resolved using the spatial distribution of microseismic event locations is limited by the accuracy and precision of the location methods. At a hard-rock mine in the Coeur D'Alene mining district of northern Idaho, two data sets consisting of calibration blast signals from a known source site and origin.

Additional Physical Format: Online version: Accuracy and precision of microseismic event locations in rock burst research studies (OCoLC) Get this from a library. Accuracy and precision of microseismic event locations in rock burst research studies. [P L Swanson;]. Accuracy and Precision of Microseismic Event Locations in Rock Burst Research Studies - RI Location of Repository Accuracy and precision of microseismic event locations in rock burst research studies / By S.

Billington, F. Boler, L. Estey, P. (Peter L.) Swanson and United States. Swanson, L. Estey, and S. Billington, "Accuracy and precision of microseismic event location in rock burst research studies," United States Bureau of Mines No.

Salamon and G. Wiebols, "Digital location of seismic events by an underground network of seismometers using the arrival times of compressional waves," Rock. The accuracy and precision of microseismic event locations were measured, analyzed, and compared for two types of location systems: “anolog” and “digital”.

In the first system, relative times of first arrival were estimated from analog signals using automated hardware circuitry; station positions were estimated from mine map coordinates; and event locations were determined using the.

Many factors influence the accuracy of microseismic data, including the number of sensors, microseismic event location precision, and precise processing of data. Therefore, rockbursts are predicted using microseismic multi-parameters including the apparent volume, spatial correlation length, energy index, fractal dimension, and b value [14].

Initial location of microseismic events detected during one month (red dots).From top to bottom: map view and cross sections along W-E and N-S directions. Receiver array showing 28 three components geophones distributed in seven boreholes (BH-1 to BH-7).

The accuracy of event location is an essential issue in microseismic monitoring. The data obtained from downhole monitoring system usually show a higher signal-to-noise ratio (SNR) than the.

The cause of a rock burst in a mining face under hard and thick roof was analyzed and rock burst prevention principle was put forward on the basis of burst danger period and danger area.

The size of the smallest active discontinuity that may potentially be resolved using the spatial distribution of microseismic event locations is limited by the accuracy and precision of the location methods.

At a hard-rock mine in Coeur d'Alene mining district of northern Idaho, two data sets consisting of calibration blast signals from a known source site and origin time and microseismic event signals.

United States. Bureau of Mines: Accuracy and precision of microseismic event locations in rock burst research studies / (Washington, D.C.: U.S. Dept. of the Interior, Bureau of Mines, ) Bureau of Mines: Coal carbonization studies.

The CDD method contains more information on absolute locations than the DD method, resulting in a much more stable absolute location determination. The synthetic and field data tests indicated that the CDD method could improve the accuracy of relative and absolute event locations in microseismic clusters.

Furthermore, they occur due to the volume change within the rock-mass or change in the shear-stress components. Knowing the microseismic event location is crucial for processing, interpretation and building a velocity model.

Creating the velocity model is the first step in determining the microseismic event's locations. Rock burst research and the Coeur d'Alene District / (Pittsburgh, Accuracy and precision of microseismic event locations in rock burst research studies / (Washington, D.C.: U.S.

Dept. of the Interior, Bureau of Mines, ). Determining Microseismic Event Locations by Semblance-weighted Stacking David W. Eaton*, Jubran Akram, Andy St-Onge and Farshid Forouhideh Department of Geoscience, University of Calgary, Calgary, AB T2N 1N4 [email protected] Summary Estimation of hypocentre locations is a key element of microseismic data processing.

In particular, accurate. A fractal calculation method was developed to investigate the self-similarity of the time distribution of microseismic events during the evolution of rock bursts. Microseismic data, which were utilized for back-analysis after the rock burst, were collected corresponding to different intensities of immediate rock bursts, occurring in the deeply.

Microseismic Event Location When a microearthquake occurs as a result of industrial activity such as mining or hydraulic fracturing, we say that a microseismic event has occurred.

The exact location where either a new rock fracture occurred, or an existing fracture was activated, is referred to as the event location or source of the event. The velocity model is a key factor that affects the accuracy of microseismic event location around tunnels. In this paper, we consider the effect of the empty area on the microseismic event location and present a 3D heterogeneous velocity model for excavated tunnels.

The grid-based heterogeneous velocity model can describe a 3D arbitrarily complex velocity model, where the microseismic.In event location problems, a common approach is to use P-wave arrival times for locating events (GeigerZhouThurber and RabinowitzFont et al, Havelock et al, Shearer ).

Similarly, many studies use single phase arrival times (P or S) as well to locate microseismic events (Bancroft et al, Kuang et al).The deviation of microseismic station location will affect the microseismic source location accuracy in microseismic monitoring.

The relationship between microseismic station location deviation and source location accuracy is studied in the paper. A global optimization algorithm, particle swarm optimization (PSO), is used to search for the source location.