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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >The December 28, 1908, Messina Straits, southern Italy, earthquake: Waveform modeling of regional seismograms
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The December 28, 1908, Messina Straits, southern Italy, earthquake: Waveform modeling of regional seismograms

机译：1908年12月28日，意大利南部墨西拿海峡，地震：区域地震图的波形建模

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Tho 1908 Messins Straits earthquake is one of the most catastrophic events in history. There were 60,000 to more than 100,000 deaths, and the cities of Messina and Reggio Calabria, on the opposite sides of the straits, were almost completely destroyed. During the last decades only low magnitude events occurred in the area. The 1908 earthquake is then crucial for understanding the mode of stress release in the area. We collected and digitized several regional seismograms of this event recorded in central Europe with the aim of studying the source characteristics. In order to separate the path effects, we analyzed recent events with simple and known sources. Owing to the small azimuth range spanned by the available stations, we could not determine a fault plane solution for the Messina Straits event, nor discriminate between the published focal mechanisms. However, the normal fault character of the rupture is confirmed. By inverting the historical P waveforms we derived source time functions. and obtained seismic moment of 5.38 (+/-2.16) x 10(19) N m (M-w=7.1). This is in good agreement with the results obtained by several authors from the inversion of the historical leveling data. This value is confirmed by the SH wave modeling, which also allowed the assessment of the unilateral northward character of the rupture propagation along an similar to 43 km fault. Finally, we applied it simple rupture model in order to derive the slip distribution along the fault. The resulting function is in good correspondence with the geodetic inversions performed by Boschi et al. [1989] and De Natale and Pingue [1991]. In particular, a maximum slip of similar to4 is located in proximity of the center of the slipped area. The high dislocation patch beneath the Messina harbor, as depicted by De Natale and Pingue, is not confirmed by our analysis and is probably connected to surface collapse of some of the bench marks. [References: 53]
机译：1908年星期四的麦辛海峡地震是历史上最严重的灾难之一。有60,000至100,000多人死亡，海峡两岸的墨西拿（Messina）和雷焦卡拉布里亚（Reggio Calabria）等城市几乎被完全摧毁。在过去的几十年中，该地区仅发生了低强度事件。然后，1908年地震对于了解该地区的应力释放模式至关重要。为了研究震源特征，我们收集了中欧地区记录的该事件的几个区域地震图并进行了数字化处理。为了分离路径影响，我们使用已知的简单来源分析了最近发生的事件。由于可用测站的方位角范围较小，我们无法确定墨西拿海峡事件的断层平面解，也无法区分已发布的震源机制。但是，确认了破裂的正常故障特征。通过反转历史P波形，我们得出了源时间函数。地震矩为5.38（+/- 2.16）x 10（19）N m（M-w = 7.1）。这与几位作者从历史水准数据反演中获得的结果非常吻合。 SH波模型证实了该值，这也允许评估沿着类似43 km断层的破裂传播的单向北特征。最后，我们应用了简单的破裂模型，以得出沿断层的滑动分布。结果函数与Boschi等人进行的大地测量反演很好地对应。 [1989]和De Natale and Pingue [1991]。特别地，在滑移区域的中心附近定位有类似于4的最大滑移。正如De Natale和Pingue所描绘的那样，墨西拿港口下方的高错位斑块并未得到我们的分析证实，可能与某些基准的表面塌陷有关。 [参考：53]

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