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_REVISION - C1996083 (2)
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_REVISION - C1996083 (2)
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Entry Properties
Last modified
11/17/2020 1:46:57 PM
Creation date
2/24/2010 11:03:22 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1996083
IBM Index Class Name
REVISION
Doc Name
Seismic Event Data Acquistition and Processing Distribition and Coordination Across PC-Based Network
Type & Sequence
PR10
Media Type
D
Archive
No
Tags
DRMS Re-OCR
Description:
Signifies Re-OCR Process Performed
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on mountain ridge tops and one in a valley bottom 365 m (1,200 ft) below. Each panel is <br /> approximately 250 m(830 ft)wide. <br /> A line-of-sight path between each remote data acquisition node and a data processing site was <br /> required for the 2.4-GHz spread-spectrum transceivers employed. Tests of wireless LAN repeaters <br /> were also made. The repeaters were found to reduce overall data processing rates to unacceptable <br /> levels in certain data acquisition modes. Both continuous and event-triggered seismic data file <br /> collection and transmission modes were investigated. Due to the high sampling rates, the data <br /> acquisition platforms created an irreversible backlog of data files when a repeater was used <br /> between a data acquisition node and the main processing node. Thus, when a repeater was <br /> required, it was necessary to collect data in event-triggered mode. <br /> North ridge array <br /> Valley array <br /> 0 <br /> LEGEND South ridge array <br /> A Sensor <br /> 0 Wireless network node <br /> p Data processing node <br /> Figure 5. Bowie No.2 Mine network. <br /> EXAMPLE SEISMIC MONITORING RESULTS <br /> Examples of seismic event locations are shown in Figures 6 and 7. Relative seismic event <br /> magnitude is indicated by the size of the symbols, with the largest event shown having an <br /> approximate magnitude of 2. The processing procedures performed for the event locations were <br /> completely software automated without human interaction. <br /> Seismicity associated with 7 m (23 ft)of retreat of the D-2 longwall coal panel at the Willow <br /> Creek Mine is shown in Figure 6.The abundant seismic activity is a product of strong,competent <br />
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