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The Preliminary Research of Earthquake Early Warning Based on Downhole Observations

Author: ChuPengYu
Tutor: LiShanYou
School: China Seismological Bureau, Institute of Engineering Mechanics
Course: Structural Engineering
Keywords: Underground stations Determination of magnitude Earthquake early warning
CLC: P315.7
Type: Master's thesis
Year: 2011
Downloads: 31
Quote: 0
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Abstract


Magnitude Rapid Determination is the key link in the earthquake early warning research has been a hot topic in the field of earthquake engineering . Under normal circumstances , the earthquake records used in the determination of the magnitude normally takes from the bedrock surface , non - bedrock and underground records need to be corrected in order to meet this requirement . This paper carried out research around the underground station observation data in earthquake early warning , the main results are as follows : ( 1 ) through the the comparison ground with downhole three-component acceleration , velocity and displacement records obtained amplitude , frequency , and signal-to-noise ratio parameters with the depth of changes in the law , and the use of seismic wave theory . ( 2 ) , respectively, at different depths of the ground and underground three-component corresponding to the PGA , PGV and PGD magnification with media impact factor fitting compare fitting results obtained by the vertical to the the PGA ground and underground magnification fitting to obtain soil affect the conclusions of the factor , reflecting the impact of the venue of seismic wave propagation . ( 3) Comparison of the P-wave and S -wave bottom-up communication to amplitude changes in the difference ground process , summarize each propagation characteristics . Draw the P wave amplitude magnification is higher than the S wave and verify the conclusions of the S wave surface twice the effect . (4 ) application of STA / LTA method of downhole and surface records preliminary phase identification , and thus the AIC criterion phases precise pickup , according to the three stations seismic P wave to determine the results and station information is listed equations seeking take the source location . (5 ) the use of the characteristic period of ground downhole depth earthquake recorded peak fit than with the magnitude , the resulting curve is a straight line parallel to each other , the corresponding characteristic period of the same magnitude will increase with depth increases. Underground record to be considered for determination of magnitude the soil seismic wave propagation , namely the use of the maximum characteristic period , vertical ground acceleration peak magnification with the magnitude of the relationship fitting relational expression . (6) Japan KIK-net ground and underground bedrock station records fitting relationship expressions do about the magnitude and characteristic period , and further verified by comparing the expression of the similarities and differences between the conclusions (5) recorded downhole determination of magnitude , the final ground and underground vertical PGA magnification correction characteristic period magnitude estimates .

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CLC: > Astronomy,Earth Sciences > Geophysics > Earth ( rock circles ) physics ( geophysics ) > Seismology > Seismic observation and forecasting
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