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首页> 外文会议>International Conference on Earthquake Engineering; 20041019-20; Nanjing(CN) >The Effect of Focal Mechanisms of Jiashi Strong Earthquake Swarm on the Characteristics of Long-period Ground Motions
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The Effect of Focal Mechanisms of Jiashi Strong Earthquake Swarm on the Characteristics of Long-period Ground Motions

机译：伽师强震群震源机制对长周期地震动特征的影响

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摘要

In 1997 a strong earthquake swarm which contained 7 earthquakes with magnitude greater than 6 occurred in Jiashi, Xinjiang, China. Another earthquake with magnitude 6.9 occurred near Jiashi in 1996. In 2003, several strong earthquakes occurred in Jiashi again. During these earthquakes, digital broad-band records were obtained in Wushi seismic station, which is one of the Geo-scope stations of France. The digital broad-band records are suitable for studying long-period ground motions. The repeated strong earthquakes in same pkce give us a very good chance to explore the effects of earthquake source on the characteristics of long-period ground motions, because it eliminates the effects of propagation path. Fortunately the focal mechanisms of these earthquakes contain strike-slip, normal and reverse faults. By analyzed the digital broad-band records of Jiashi strong earthquake swarm, we can conclude that: (1) The magnitude of earthquake has strong effects on the long-period ground motions. Larger earthquake has more long-period ground motion contents; (2) Compared with the strike-slip earthquakes, the oblique-faulting earthquakes have more long-period contents in vertical component; (3) The long-period horizontal acceleration response spectra of strike-slip earthquakes are higher than that of the normal-faulting earthquakes, but it is difficult to figure out whether it is due to the focal mechanism or the lower stress-drop of normal-faulting earthquakes.
机译：1997年，中国新疆喀什发生了一场强地震群，其中包含7次地震，震级大于6级。 1996年，在石狮附近发生了6.9级地震。2003年，石狮再次发生了几次强地震。在这些地震期间，在法国的地理观测站之一的乌什地震台站获得了数字宽带记录。数字宽带记录适用于研究长时间的地面运动。在相同峰度中反复发生的强地震为我们提供了一个很好的机会来探索地震源对长周期地震动特征的影响，因为它消除了传播路径的影响。幸运的是，这些地震的震源机制包括走滑，正断层和逆断层。通过对伽师强震群的数字宽带记录进行分析，可以得出以下结论：（1）地震烈度对长周期地震动有很大影响。地震越大，地面运动的周期越长。 （2）与走滑地震相比，斜断层地震的垂向分量长周期含量更高； （3）走滑地震的长周期水平加速度响应谱高于正常断层地震，但很难弄清楚这是由于震源机制还是正常的应力降较小所致。破坏性地震。

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