E T 0 = γ 0 = 1 + R γ = nσ n nσ n ΔT 2 i - Σ n ΔT i T Pi - Σ n Σ n

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秃毓齐
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1 ~ EARTHQUAKE RESEARCH IN CHINA Vol. 27 No. 2 Jun ~ km 65km NE % P315 A Nakamura et al 2002 Li et al 1998 Korneev et al 2000 Schaff et al longhaiying03@ yahoo. com. cn

2 E T 0 = γ 0 = 1 + R γ = nσ n nσ n ΔT 2 i - Σ n ΔT i T Pi - Σ n Σ n ΔT i T Pi Σ n ΔT i Σ n ΔT i 2 - nσ n - Σ n ΔT i 2 T PiΣ n T PiΣ n ΔT i 2 Σ n T Pi - T P ΔT i - ΔT i Σ n T Pi 槡 - T P 2 Σ n σ γ = γ nσ n 槡 n - 2 [ nσ n ΔT i δt Pi ' 2 ΔT i 2 δt Pi ' = T Pi - T 0 - ΔT i γ 0-1 ΔT i ΔT i ΔT i - Σ n 2 ΔT i ] ΔT i = T Si - T Pi i T Pi i

3 ( ) T Si i T P = 1 T n Σn Pi ΔT i = 1 ( n ) T 0 R γ σ γ ΔT Σn i γ E E

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6 b a 70km 65km NNE a M L M L % % km 65km NNE

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8 v P /v S 26 1 ~ ~ ~ ~ ~ ~ ~ 137 Korneev V A McEvilly T V Karageorgi E D 2000 Seismological studies at Parkfield. VIII Modeling the observed travel time changes Bull Seismol Soc Amer ~ 708. Li Y G Vidale J E Aki K et al 1998 Evidence of shallow fault zone healing after the 1992 M7. 5 Landers California earthquake Science ~ 219. Nakamura A Hasegawa A Hirata N et al 2002 Temporal variations of seismic wave velocity associated with 1998 M6. 1 Shizukuishi earthquake Pure Appl Geophys ~ Schaff D P Beroza G C 2004 Coseismic and postseismic velocity changes measured by repeating earthquakes J Geophys Res 109 B10302 doi /2004JB Case analysis of wave velocities ratio abnormity before Hejing M5. 6 earthquake in Xinjiang Long Haiying Nie Xiaohong Tang Lanlan Earthquake Administration of Xinjiang Uygur Autonomous Region Urumqi China Abstract The authors used digital wave data of earthquakes in the middle of Tianshan mountains Xinjiang and Heda method of multi-stations to calculate changes of wave velocities ratio before and after the Hejing M5. 6 earthquake on August They obtained the result as follows 1In space it forms a low value area of ellipse before the Hejing earthquake with M5. 6. The half of the long axis is approximately 70km while that of the short axis is approximately 65km. And the trend of the ellipse is NE. The Hejing M5. 6 earthquake occurred in northwest part of the ellipse. 2Temporarily it appeared as low value abnormity of 10 months before the Hejing M5. 6 earthquake. Before this earthquake the value was obviously high. It forms a model of normal-fall-high value-earthquake. In the calculation process the error of wave velocities ratio is controlled in less than and the correlation coefficient reached above 99. 0%. Key words Hejing M5. 6 earthquake Wave velocities ratio Middle of Tianshan mountain Xinjiang

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Microsoft Word - d27 彭玉柱.doc 第 10 卷第 2 期 2015 年 6 月震灾防御技术 Technology for Earthquake Disaster Prevention Vol. 10,No. 2 Jun.,2015 彭玉柱, 张世民, 李建章,2015. 中强地震前周至台地电阻率的异常变化. 震灾防御技术,10(2):455 463. doi:10.11899/zzfy20150227