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Atmospheric Precipitation and Anomalous Upper Mantle in Relation to Intraplate Seismicity in Norway
Tectonics ( IF 4.2 ) Pub Date : 2020-08-31 , DOI: 10.1029/2020tc006070
Yuriy Petrovich Maystrenko 1 , Marco Brönner 1 , Odleiv Olesen 1 , Tuomo Mikael Saloranta 2 , Trond Slagstad 1
Affiliation  

Two enigmatic regions of high intraplate seismicity in Norway (Western Norway and the Nordland area) show a temporal correlation between the number of earthquakes within the upper crystalline crust and intensity of rain and snowmelt at the Earth's surface. This correlation is obvious in the Nordland area where detailed and reliable data on seismicity are available, whereas the correlation is weaker in Western Norway where detailed data on seismicity are missing. Moreover, these discrete zones of high seismic activity coincide spatially with prominent, low‐velocity, and, most likely, thermally anomalous zones in the upper mantle. We propose that in addition to other causes, the high seismicity may be controlled by the anomalous upper mantle, along with topographically induced gravitational potential energy and crustal density variations. Precipitation‐induced, seasonal increases in pore‐fluid pressure within the fractured crystalline bedrock and changes in water loads may modulate the tectonically controlled seismicity.

中文翻译:

挪威大气降水和上地幔异常与板内地震的关系

挪威的两个板块内地震活动较高的神秘区域(挪威西部和诺德兰地区)显示出上部地壳内的地震次数与地球表面雨雪融化的强度之间存在时间相关性。在可获得详细而可靠的地震活动数据的诺德兰地区,这种相关性显而易见,而在缺少地震活动性详细数据的挪威西部,相关性较弱。此外,这些高地震活动的离散区域在空间上与上地幔中的突出,低速,最有可能是热异常区域重合。我们提出,除其他原因外,高地震活动可能由异常的上地幔以及地形诱发的重力势能和地壳密度变化控制。
更新日期:2020-08-31
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