林邦惠, 董大南. 正交和斜交破裂过程的研究及其在邢台地震的应用[J]. 华北地震科学, 1986, 4(2): 16-25.
引用本文: 林邦惠, 董大南. 正交和斜交破裂过程的研究及其在邢台地震的应用[J]. 华北地震科学, 1986, 4(2): 16-25.
Lin Banghui, Dong Danan. A STUDY OF ORTHOGONAL AND OBLIQUE RUPTURE PROCESS AND ITS APPLICATION TO THE 1966 XINGTAI EARTHQUAKES[J]. North China Earthquake Sciences, 1986, 4(2): 16-25.
Citation: Lin Banghui, Dong Danan. A STUDY OF ORTHOGONAL AND OBLIQUE RUPTURE PROCESS AND ITS APPLICATION TO THE 1966 XINGTAI EARTHQUAKES[J]. North China Earthquake Sciences, 1986, 4(2): 16-25.

正交和斜交破裂过程的研究及其在邢台地震的应用

A STUDY OF ORTHOGONAL AND OBLIQUE RUPTURE PROCESS AND ITS APPLICATION TO THE 1966 XINGTAI EARTHQUAKES

  • 摘要: 本文探讨了用P波频谱研究正交和斜交震源破裂方式的方法。计算和分析了正交和斜交双侧、三侧破裂P波远场理论位移谱,并采用网格尝试法确定震源参数,研究了邢台地区1966年3月8日马兰6.8级地震和1966年3月22日东汪6.7级地震的破裂过程。#br#研究结果表明:马兰地震的破裂方式是斜交三侧破裂。北北东方向为主破裂,破裂长度约29公里,其北东端在3月22日7.2级主震震区附近。东旺地震的破裂方式是正交三侧破裂,南南西方向为主破裂,破裂长度约23公里。另两侧破裂分别指向北西西方向,即8分钟后的7.2级主震方向及北北东方向,即四天后发生的6.5级百尺口地震的方向,虽然破裂规模较小(分别为10公里及6公里),但对其后这两地震的发生起了促进作用。这两地震的结果与余震震中分布图中显示的图象均很相象。

     

    Abstract: In the paper,the method of studying the orthogonal and oblique ruptures of earthquake source by using spectral amplitudes of P wave is discussed.The theoretical spectral amp-litudes of P wave displacement in far-field of the orthogonal and oblique ruptures which are bilateral or trilateral are calculated and analysed.We Use the grid trial method to determine the source parameters.By using this method,ruptrre processes of the two Xingtai earthquakes witb Ms=6.8 at Malan on March 8.1966 and Ms=6.7 at Dongwang on March 22.1966 are studied.#br#The results show that the rupture of the Malan earthquake is oblique and trilateral with its principal rupture striking NNE and about 29 km in length,and that the NNE end of the rupture is near the region of the main shock of March 22.The rupture of the Dong-wang earthquake is orthogonal and trilateral with its principal rupture striling SSW and about 23 km in length.The other two branches of the rupture are toward NWW and NNE, respectively.The former is in the direction of the main shock with Ms=7.2,occurred 8 minutes later.The latter is in the direction of the Baichikou earthquake(Ms=6.5)occurred 4 days later.Although their lengthes are only 10 km and 6 km,respecticely,they seem to have triggered the two following shocks.The rupture procsses of the two earthquakes mentioned above and the distribution of their aftershocks are very similar.

     

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