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首页> 外文期刊>Pure and Applied Geophysics >Seismicity Variations in the Southern Aegean, Greece, Before and After the Large (M7.7) 1956 Amorgos Earthquake Due to Evolving Stress
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Seismicity Variations in the Southern Aegean, Greece, Before and After the Large (M7.7) 1956 Amorgos Earthquake Due to Evolving Stress

机译：由于应力的不断变化，希腊爱琴海南部1956年大（M7.7）阿莫尔戈斯地震前后的地震活动变化

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摘要

The largest earthquake (M0=4.9·1027 dyn·cm) of the 20th century in the territory of Greece occurred south of Amorgos Island, causing extensive destruction in the southern Aegean area. It occurred on an ENE–trending normal fault that is seated parallel to the Island’s southern coastline. Changes in the rates of moderate–size earthquakes (M ≥ 5.0) that occurred before and after the Amorgos earthquake, within circular regions centered on its epicenter with radii of 100, 150 and 200 km, are investigated. The rate for moderate–size events just before the main shock appears to be considerably increased when compared to those of either preceding or subsequent periods. Further inspection reveals that more evident seismicity fluctuations are attributed to distances exceeding 100 km. These changes may be indicative of a broad region that is approaching a high stress state prior to an eventual large earthquake. Close to the main event, that is, within the 100–km radius, a remarkable quiescence period lasting about two decades before its occurrence was observed. Changes in seismicity are discussed in combination with static stress changes calculated by the application of the stress evolutionary model that takes into account the coseismic slip associated with the larger events (M ≥ 6.5) since the beginning of the 20th century and the tectonic loading on the major faults in the study area. These larger events, as with the intermediate magnitude seismicity taking place at distances exceeding 100 km and which encircled the quiescent area observed during the last 22 years before the Amorgos earthquake, are well correlated with stress-enhanced areas in each stage of the evolutionary model.
机译：希腊领土是20世纪最大的地震（M0 = 4.9·1027 dyn·cm），发生在阿莫尔戈斯岛以南，在爱琴海南部地区造成大规模破坏。它发生在与岛的南部海岸线平行的ENE趋势正断层上。调查了阿莫尔戈斯地震前后震级为100、150和200 km的圆形区域中度地震（M≥5.0）发生率的变化。与之前或随后时期相比，在主震之前中等规模事件的发生率似乎已大大提高。进一步检查发现，更明显的地震活动性起伏归因于距离超过100 km。这些变化可能表明在最终的大地震之前，一个接近高应力状态的大区域。接近主要事件，即在100公里半径内，一个显着的静止期持续了大约二十年，直到观测到它发生为止。讨论了地震活动性的变化，并结合应力演化模型计算出的静态应力变化，该模型考虑了自20世纪初以来的较大地震（M≥6.5）与同震相关的同震滑动。研究区主要断层的构造负荷。这些较大的事件，如发生在超过100 km的距离处的中等强度地震活动，环绕了在阿莫尔戈斯地震前最后22年观察到的静止区域，在演化模型的每个阶段都与应力增强区域密切相关。

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