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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Seasonal patterns of seismicity and deformation at the Alutu geothermal reservoir, Ethiopia, induced by hydrological loading
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Seasonal patterns of seismicity and deformation at the Alutu geothermal reservoir, Ethiopia, induced by hydrological loading

机译：水文负荷引起的埃塞俄比亚阿鲁图地热库地震活动和变形的季节性模式

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摘要

Seasonal variations in the seismicity of volcanic and geothermal reservoirs are usually attributed to the hydrological cycle. Here, we focus on the Aluto-Langano geothermal system, Ethiopia, where the climate is monsoonal and there is abundant shallow seismicity. We deployed temporary networks of seismometers and GPS receivers to understand the drivers of unrest. First, we show that a statistically significant peak in seismicity occurred 23 months after the main rainy season, with a second, smaller peak of variable timing. Seasonal seismicity is commonly attributed to variations in either surface loading or reservoir pore pressure. As loading will cause subsidence and overpressure will cause uplift, comparing seismicity rates with continuous GPS, enables us to distinguish between mechanisms. At Aluto, the major peak in seismicity is coincident with the high stand of nearby lakes and maximum subsidence, indicating that it is driven by surface loading. The magnitude of loading is insufficient to trigger widespread crustal seismicity but the geothermal reservoir at Aluto is likely sensitive to small perturbations in the stress field. Thus we demonstrate that monsoonal loading can produce seismicity in geothermal reservoirs, and the likelihood of both triggered and induced seismicity varies seasonally. (C) 2018 The Authors. Published by Elsevier B.V.
机译：火山和地热储层地震活动的季节性变化通常归因于水文循环。在这里，我们关注埃塞俄比亚的Aluto-Langano地热系统，那里的气候是季风性的，并且具有丰富的浅层地震活动。我们部署了地震仪和GPS接收器的临时网络，以了解动乱的驱动因素。首先，我们表明，在主要雨季后的23个月，地震活动出现了统计上的显着高峰，第二个较小的可变时间高峰出现了。季节性地震活动通常归因于表面负荷或储层孔隙压力的变化。由于载荷会引起沉降，而超压会引起隆升，因此，将地震活动率与连续GPS进行比较可以使我们区分机制。在阿鲁托，地震活动的主要高峰与附近湖泊的高水位和最大的沉降一致，表明它是由地表载荷驱动的。载荷的大小不足以引发广泛的地壳地震活动，但在Aluto的地热储层可能对应力场中的小扰动敏感。因此，我们证明季风荷载可以在地热储层中产生地震活动，并且触发和诱发地震活动的可能性随季节而变化。 （C）2018作者。由Elsevier B.V.发布

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