本文選題：地震學(xué) + 平動(dòng)速度��； 參考：《地球科學(xué)》2017年04期

【摘要】：三分量旋轉(zhuǎn)地震動(dòng)是目前地球物理研究重點(diǎn)之一.利用爆炸震源的平動(dòng)地震儀觀測資料,通過間接計(jì)算獲得三分量旋轉(zhuǎn)地震動(dòng).利用了3炮500kg炸藥的觀測資料,3個(gè)爆炸點(diǎn)到觀測臺陣的距離分別是1.8、2.8和8.9km,計(jì)算得到了臺陣相對于這3個(gè)爆炸點(diǎn)的旋轉(zhuǎn)地震動(dòng),其最大峰值旋轉(zhuǎn)角速度分別是41.65、21.98和0.29μrads/s,與國際同行的旋轉(zhuǎn)地震動(dòng)結(jié)果量級接近.地震動(dòng)峰值隨震中距的衰減是地震工程中關(guān)注的問題.提取出三分量的旋轉(zhuǎn)角速度峰值,利用指數(shù)函數(shù)對三分量的峰值進(jìn)行擬合,初步得到三分量的旋轉(zhuǎn)地震動(dòng)角速度峰值隨震中距的衰減關(guān)系.衰減曲線的主要特征是,1~3km旋轉(zhuǎn)角速度能量迅速衰減,大于5km以后衰減逐漸減慢,隨著震中距增大曲線的變化越來越趨于平緩.
[Abstract]:Three component rotational ground motion is one of the key points in geophysics. Using the observational data of the translational seismograph of the explosion source, three component rotational ground motion is obtained by indirect calculation. Using the observation data of 500kg explosive, the distance between the three explosion points and the observation array is 1.8 and 8.9 km, respectively. The rotational ground motion of the array relative to these three explosion points is calculated. The maximum angular velocities of rotation are 41.65U 21.98 and 0.29 渭 rads / s, respectively, which are close to those of the international counterparts. The attenuation of the peak value of ground motion with epicentral distance is an important problem in seismic engineering. The peak value of rotation angular velocity of three components is extracted, and the peak value of three components is fitted by exponential function, and the attenuation relation of angular velocity peak of three components of rotational ground motion with epicenter distance is preliminarily obtained. The main characteristic of the attenuation curve is that the energy of rotation angular velocity of 3km is rapidly decaying, and the attenuation gradually slows down after the attenuation is larger than 5km, and the variation of the curve tends to be more and more gentle with the increase of epicentral distance.
【作者單位】： 中國地震局地球物理勘探中心;
【基金】：國家自然科學(xué)基金項(xiàng)目(Nos.41374099,41074069)
【分類號】：P315.7

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