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STRONG MOTION OBSERVATION AND ANALYSIS OF JIASHI, XINJIANG, M_S5.4 EARTHQUAKE ON JANUARY 4, 2003

A M\-S5.4 earthquake occurred in Jiashi, Xinjiang, on Jan. 4, 2003. Intensity VI effects were noted at the epicenter. The digital strong motion seismograph that was set in the Jiashi county town recorded the accelerations of the mainshock and a magnitude 4.2 aftershock, and the maximum horizontal acceleration amounted to 66.12 gal. By analyzing the characteristics of the earthquake motion, the conclusions were drawn: (1) the performance of the GDQJ1A strong motion seismograph is fine; (2) the acceleration time histories shown that the vertical Pwave initial motions were sharp and the strong motion durations were long, the longest to 7.5 s, but the horizontal initial motions were weak and the strong motion durations were short, only 2.5 s.