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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Regional waveform propagation in the Arabian Peninsula
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Regional waveform propagation in the Arabian Peninsula

机译：阿拉伯半岛的区域波形传播

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Regional waveform propagation is characterized in the Arabian Peninsula using data from a temporary network of broadband seismometers. Between November 1995 and March 1997, 332 regional (delta < 15 deg) events were recorded from nine stations deployed across the Arabian Shield. Regional phase propagation was analyzed in two ways: by individual inspection of the waveforms and by stacking of waveforms. Inspection of the waveforms revealed consistent variations in individual seismograms according to the region of origin. Waveforms from events in the Gulf of Aqaba, northwest of the network, possess weak Pn, Pg, and Sn but show a prominent Lg phase. In contrast, clear Pn, Sn, and Lg are observed for events located in the Zagros, a region northeast of the network. Events near the Straits of Hormuz also display Pn and Sn but lack a strong high-frequency Lg. Southern Red Sea and African earthquakes have moderate-amplitude body phases with some Lg. For the stacks the data were high-pass filtered at 1 Hz, rectified, binned, and then stacked by time/distance or by time/slowness. The time/distance stacks show clear differences between regions that correspond to the variations observed in individual seismograms. The time/slowness stacks allow comparison of relative phase velocities and amplitudes. Pn velocity under the network was estimated to be 8.0 +- 0.2 km/s, consistent with data from prior refraction profiles. The area of inefficient Pn and Sn propagation coincides with an area of Holocene volcanism and suggests that anomalous upper mantle underlies much of the Arabian Shield.
机译：阿拉伯半岛使用来自宽带地震计的临时网络的数据来表征区域波形的传播。在1995年11月至1997年3月之间，从横跨阿拉伯盾的9个台站记录了332个区域性事件（δ<15度）。通过两种方式分析区域相位传播：通过单独检查波形和通过叠加波形。对波形的检查显示，各个地震图中根据源区域的变化是一致的。来自网络西北部亚喀巴湾事件的波形具有弱的Pn，Pg和Sn，但显示出明显的Lg相。相反，在位于网络东北部Zagros的事件中观察到了清晰的Pn，Sn和Lg。霍尔木兹海峡附近的事件也显示Pn和Sn，但缺乏强高频Lg。南部红海和非洲地震具有中等振幅的体相，且含Lg。对于堆栈，将数据以1 Hz进行高通滤波，整流，合并，然后按时间/距离或时间/慢度进行堆栈。时间/距离堆栈显示出区域之间明显的差异，这些差异与单个地震图中观察到的变化相对应。时间/慢度堆栈允许比较相对相位速度和幅度。网络下的Pn速度估计为8.0±0.2 km / s，与先前折射剖面的数据一致。低效率的Pn和Sn传播区域与全新世的火山活动区域重合，这表明异常的上地幔是阿拉伯盾大部分的基础。

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