| 用平滑滤波拟合法分析大同地震前后地壳垂直形变 |
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| 引用本文： | 杨国华.用平滑滤波拟合法分析大同地震前后地壳垂直形变[J].内陆地震,1994,8(1):28-32. |
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| 作者姓名： | 杨国华 |
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| 作者单位： | 国家地震局第一地形变监测中心 |
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| 摘 要： | 利用平滑滤波拟合法，对大同地震（Ｍｓ＝６．１）前后的３期（１９８４、１９８７、１９９１）地壳垂直形变资料进行了处理和分析。结果非常清晰地显示出大同地震前的地壳垂直形变模式为典型的四象限分布特征。其主压应力方向近似为南—北向，主张应力方向近似为东—西向，这与震时的震源机制解一致。震后的地壳垂直运动恰好相反，明显地反映了弹性回跳特征，震源也刚好位于四象限交叉点附近。获得如此清晰的震前四象限分布图象，目前确实少有。
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| 关 键 词： | 地壳垂直运动，大同地震，平滑滤波 |
STUDY ON THE VERTICAL CRUSTAL MOVEMENT BEFORE AND ATER DATONG EANTHQUAKE THROUGH THE METHOD OF SMOOTHING FILTERING AND FITTING |
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| Yang Guohua.STUDY ON THE VERTICAL CRUSTAL MOVEMENT BEFORE AND ATER DATONG EANTHQUAKE THROUGH THE METHOD OF SMOOTHING FILTERING AND FITTING[J].Inland Earthquake,1994,8(1):28-32. |
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| Authors: | Yang Guohua |
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| Abstract: | The vertical crustal movement data (in 1984, 1987 and 1991)before and after Datongearthquake (Ms = 6. 1) are processed and analysed with smoothing filtering and fitting methods. The result clearly shows that the vertical crustal deformation model before Datong earthquake is a typical quadrantal distribution. Its principle compressive stress is approximately in NS direction,and its principle tension stress is approximately in EW direction.These are agreed with the foCal -mechanism solution. The vertical crustal movement after the quake is just on the contrary. This shows the characteristics of elastic rebound and the hypocenter is just near the quadrantal intersection. It is rare that such dear quadrantal distribution pattern had been obtained |
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| Keywords: | Vertical crustal movement Datong earthquake Smoothing filtering |
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