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吉林深震的构造背景和区域地震能量的异常讨论 总被引：1，自引：0，他引：1
从吉林深震的形成与板块构造活动的关系入手，介绍了深震与吉林省区域构造活动背景的联系。利用测震学活动性指标，讨论了发震前后区域地震能量时空变化的特点，并结合对前兆资料的分析，得出了深震前后区域地震能量的累积与释放的特点。本文试图阐明异同，探讨机制，以期对地震活动规律的研究有所帮助。 相似文献
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“亚洲深部构造图”是《亚州陆海大地构造图》的基础图件之一.“亚洲深部构造图”给出,在不同的壳体中不同的大地构造单元,深部构造处于明显差异的状态,在不同的壳体现处于相同大地构造发展阶段的区域,深部构造状态有明显的共性。这反映不同壳体里不同、大地构造单元是地球动力学的结果.在亚洲区域深部,存在两个可能的物质流汇聚带:特提斯带和环太平洋带。存在一些可能的物质流发散中心.其中大陆区的最大发散中心位于中亚。西藏高原由于位于北面的中亚发散中心(向南)和南面的印度洋北部发散中心(向北)的深部物质池蠕动聚合,形成了独特的构造区。由于西藏深部物质流聚合以南北向为主.东亚岛弧带深部物质流聚合以东西向为主,在亚洲东部古陆上形成了东经105°左右的横桓在此洲大陆中部的南北构造带。这些特征,构成了亚洲区域的主要构造格局。 相似文献
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Most studies of seismic noise cross-correlation (NCC) have focused on regional/continental scale imaging using empirical surface-wave Green’s functions extracted from primary (0.05–0.08 Hz) and secondary (0.1–0.16 Hz) microseisms. In this work, we present the NCC results at higher frequencies (>0.5 Hz) from 6 months seismic noise recorded by a local array (~4 km aperture) deployed along the Calico fault in the Mojave Desert, California. Both fast and slow propagating waves are observed from the NCC record-sections. We compare the NCCs from sensor pairs that share a common sensor with the records of a borehole shot located very close to this common sensor. The result shows a good match of the slow surface-wave arrivals, indicating that the NCC method is able to recover unbiased surface-wave Green’s functions at local scales. The strong body-wave NCC component is caused by the P waves generated offshore California. Along a SW–NE profile across the fault, we observe apparent P-wave arrivals and their reflections, which can be explained by a low-velocity-zone (LVZ) along the Calico fault. We calculate the LVZ width to be ~ 2.3 km, and the P-wave velocity reduction within the LVZ to be ~35 %. These estimates are consistent with other evidence for a relatively wide LVZ along the Calico fault. 相似文献
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