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首页> 外文期刊>Journal of Volcanology and Geothermal Research2012V243-244NOCT,15 >Seismicity of the Hengill area, SW Iceland: Details revealed by catalog relocation and collapsing
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Seismicity of the Hengill area, SW Iceland: Details revealed by catalog relocation and collapsing

机译：冰岛西南部亨吉尔地区的地震活动：通过目录迁移和折叠而揭示的细节

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The spatial distribution of seismicity in the Hengill region, SW Iceland, is analyzed by relocation and collapsing. The Hengill region is a diffuse triple junction with volcano-tectonic activity associated with rifting, tectonic activity on a transecting transform and induced seismicity due to drilling and injection of fluid into geothermal fields. The Icelandic Meteorological Office has compiled 114,000 events over a 20-year period within an area of approximately 600 km(2). The events in their catalog are relocated by application of empirical travel-time tables using a non-linear location strategy. The relocations are then redone applying a Bayesian inversion using the catalog event density as a prior. Finally, they are collapsed using the same catalog density as an attractor. We show that this catalog processing reproduces details of the spatial pattern of seismicity that independently emerges from relative relocations of a small subset of the catalog events (swarm activity). In particular, the predominant faulting orientations are reproduced in different parts of the region and the depth distribution of events resembles that obtained by dense deployments in the area. Its depth extent varies between 5 and 7 km in the northern part of the region, where volcanic processes dominate, and between 7 and 8 km in the southern part, where tectonic deformation is predominant. Induced seismicity is shallower than adjacent natural seismicity. An intriguing lineation emerges in the lateral distribution of inferred depth to the brittle-ductile transition in the northern volcanic part of the region, which is parallel to the strike of the fissure swarms in the area. Associating this transition with an isotherm (650 degrees C), the Hengill volcanic system and its fissure swarm appear to be considerably cooler than the Hromundartindur system. This may relate to a recent intrusion into the latter or more efficient cooling in the Hengill fissure swarm due to deeper penetrating permeability. In both cases this has potential consequences for geothermal exploitation in the area. (C) 2019 Elsevier B.V. All rights reserved.
机译：通过重新安置和坍塌分析了冰岛西南部亨格尔地区的地震活动性的空间分布。亨吉尔地区是一个扩散的三重交界处，具有与裂谷有关的火山构造活动，横断转换上的构造活动以及由于向地热田中钻井和注入流体而引起的地震活动。冰岛气象局在20年的时间里，在约600 km（2）的面积内编制了114,000个事件。目录中的事件通过使用非线性位置策略通过经验行程表进行重新定位。然后使用目录事件密度作为先验，使用贝叶斯反演重做重定位。最后，使用与吸引子相同的目录密度将其折叠。我们表明，此目录处理重现了地震活动的空间模式的详细信息，该空间模式独立于目录事件的一个小子集（群活动）的相对重定位而独立出现。特别是，主要的断层取向在该区域的不同部分中再现，并且事件的深度分布类似于该区域的密集部署所获得的事件。在该地区北部，以火山作用为主的深度范围在5至7 km之间；在南部地区，以构造变形为主，其深度范围在7至8 km之间。诱发地震活动性比相邻的自然地震活动性浅。在该区域北部火山岩部分的脆性-延性转变的推断深度的横向分布中出现了一个有趣的线条，与该地区的裂变群的走向平行。将这一转变与等温线（650摄氏度）相关联，亨吉尔火山系统及其裂隙群似乎比Hromundartindur系统凉爽得多。这可能与最近侵入亨格裂隙群中的后者或更有效的冷却有关，这是由于更深的穿透渗透性所致。在这两种情况下，这都会对该地区的地热开采产生潜在影响。 （C）2019 Elsevier B.V.保留所有权利。

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