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Identification of T-Waves in the Alboran Sea

机译：阿尔伯兰海中T波的识别

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Analyses of seismograms from similar to 1,100 north-Moroccan earthquakes recorded at stations of the Red Sismica de Andalucia (Southern Spain) reveal the systematic presence of late phases embedded in the earthquake codas. These phases have distinctive frequency contents, similar to the P and S spectra and quite different to the frequency contents of the earthquake codas. They are best detected at near-shore stations. Their amplitudes decay significantly with distance to the shoreline. The delays with respect to the P-wave onsets of the preceding earthquakes are consistently around 85 s. Late phases are only detected for earthquakes located in a small region of about 100 x 60 km centered at 35.4A degrees N, 4.0A degrees W near the northern coast of Morocco. Several hypotheses could, in principle, explain the presence of these late phases in the seismograms, for example, the occurrence of low-energy aftershocks, efficient wave reflections, or Rayleigh waves generated along the source-station paths. However, we conclude that the most-likely origin of these phases corresponds to the incidence of T-waves (generated by conversion from elastic to acoustic energy in the north-Moroccan coast) in the southern coast of the Iberian Peninsula. T-waves are thought to be generated by energy trapping in low-velocity channels along long oceanic paths; in this case, we demonstrate that they can be produced in much shorter paths as well. Although T-waves have been already documented in other areas of the Mediterranean Sea, this is the first time that they have been identified in the Alboran Sea.
机译：在红色安达卢西亚（西班牙南部）台站记录的大约1100次北摩洛哥地震中的地震图分析表明，系统存在于地震尾波中。这些相位具有独特的频率含量，类似于P和S频谱，并且与地震尾波的频率含量完全不同。最好在近岸站发现它们。它们的振幅随着到海岸线的距离而显着衰减。相对于先前地震的P波发作的延迟始终在85 s左右。仅在位于摩洛哥北部海岸附近以北35.4A度，W 4.0A度为中心的约100 x 60 km的小区域中的地震中检测到后期。原则上，几个假设可以解释地震图中这些后期的存在，例如，低能余震的发生，有效波反射或沿震源站路径产生的瑞利波。但是，我们得出的结论是，这些阶段最可能的起源与伊比利亚半岛南部海岸的T波（由北摩洛哥海岸的弹性能转换为声能产生）有关。 T波被认为是由于沿长洋路的低速通道中的能量捕获而产生的。在这种情况下，我们证明了它们也可以在更短的路径上生产。尽管在地中海的其他地区已经记录了T波，但这是第一次在Alboran海中发现它们。

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