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首页> 外文期刊>Physics of the Earth and Planetary Interiors: A Journal Devoted to Obsevational and Experimerntal Studies of the Chemistry and Physics of Planetary Interiors and Their Theoretical Interpretation >Volcanic unrest of the Colli Albani (central Italy) detected by GPS monitoring test
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Volcanic unrest of the Colli Albani (central Italy) detected by GPS monitoring test

机译：GPS监测测试发现Colli Albani（意大利中部）的火山动荡

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摘要

The Colli Albani volcanic complex, located in central Italy about 15 km SE of Rome, has been dominated by periodic eruptive histories started about 561 ka and ending with the most recent and voluminous activity of the Albano maar (<70ka) phase. Earthquakes of moderate intensity, gas emissions and significant ground deformations are the recent evidences of a residual activity. We decided to start a monitoring test by installing as first step three GPS permanent stations on the volcanic structure, in sites easily accessible. The analysis of about 2 years of GPS observations has evidenced a peculiar velocity pattern of the Colli Albani stations with respect to those located nearby, but outside the volcano edifice. With respect to Eurasia, the horizontal velocities are NE directed with magnitudes of 2.2 +/- 1.4 mm/year (RDPI), 3.0 +/- 0.8 mm/year (RMPO) and 3.3 +/- 1.2 mm/year (NEMI). The uplift rates are determined with minor accuracy and range from 3.3 and 6.0 mm/year. We used a non-linear inversion algorithm to determine the best-fit parameters for a Mogi spherical source based on the Levenberg-Marquardt least squares approach. The best-fit is obtained with a source at 4.6 kin depth beneath the western flank of the volcano and a volume variation of 3.6 x 10(-4) km(3)/year. This result is in agreement with the volume rate retrieved by PS-InSAR technique and rather different from the rate inferred from leveling surveys. Consequently, non-linear trends of the hydrothermal system charge cannot be excluded apriori and the continuous GPS monitoring should be considered a priority in assessing the hazard of the Colli Albani.
机译：位于意大利中部罗马东南15公里处的Colli Albani火山综合体一直以周期性喷发历史为主，该历史始于约561 ka，并以Albano maar（<70ka）相的最新活动而结束。强度适中，气体排放和地面变形严重的地震是残余活动的最新证据。我们决定通过在容易到达的地点在火山结构上安装三个GPS永久站作为第一步来启动监视测试。对大约2年GPS观测的分析表明，相对于附近但在火山大厦之外的位置，Colli Albani测站具有独特的速度模式。关于欧亚大陆，水平速度是NE指向的，幅度为2.2 +/- 1.4毫米/年（RDPI），3.0 +/- 0.8毫米/年（RMPO）和3.3 +/- 1.2毫米/年（NEMI）。提升速率的确定精度较低，范围为每年3.3到6.0毫米。我们基于Levenberg-Marquardt最小二乘方法，使用非线性反演算法来确定Mogi球形光源的最佳拟合参数。最合适的源是火山西翼下4.6 kin深度的源，体积变化为3.6 x 10（-4）km（3）/年。此结果与通过PS-InSAR技术获得的体积速率一致，并且与从水准测量推断的速率大不相同。因此，先验不能排除热液系统装料的非线性趋势，在评估库利阿尔巴尼的危害时，应将连续的GPS监测视为优先事项。

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