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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Chemical (He, H_2, CH_4, Ne, Ar, N_2) and isotopic (He, Ne, Ar, C) variations at the Solfatara crater (southern Italy): mixing of different sources in relation to seismic activity
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Chemical (He, H_2, CH_4, Ne, Ar, N_2) and isotopic (He, Ne, Ar, C) variations at the Solfatara crater (southern Italy): mixing of different sources in relation to seismic activity

机译：Solfatara火山口（意大利南部）的化学（He，H_2，CH_4，Ne，Ar，N_2）和同位素（He，Ne，Ar，C）变化：与地震活动有关的不同来源的混合

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摘要

Here we describe temporal variations of noble gas (He, Ne and Ar), carbon isotopes and chemical data of fluids collected at the Bocca Grande fumarole (Solfatara crater) from 1990 to 1994, before the occurrence of a seismic swarm. After more than seven years of quiescence, a sudden vertical ground deformation and a seismic swarm of 100 quakes with an M_(max) = 1.5 with epicenter located beneath the Solfatara crater, was recorded from August 23 to 25 1994. Isotopic composition of He, Ne, Ar and C (from CO_2) and abundances of He, Ne, Ar, H_2, CH_4 and N_2 have been analysed from fumarolic fluids collected at the Solfatara crater. To data these isotopic ratios have not been used as precursors of earthquakes, although several cases have been reported in which the helium isotopic ratio was used to interpret volcanic unrest. All the analyzed isotopic ratios, chemical species and a calculated equilibrium temperature show a significant change a few months before the occurrence of the seismic activity and ground deformation, followed by a sudden return to values recorded prior the swarm. Migration towards the surface of deep (and hotter) gas phase related to crustal and magmatic sources with the following decrease of the surficial atmospheric component is the cause of such wide variations.
机译：在这里，我们描述了1990年至1994年地震群发生之前，在Bocca Grande fumarole（Solfatara火山口）收集的稀有气体（He，Ne和Ar），碳同位素和流体化学数据的时间变化。经过七年多的静止，1994年8月23日至25日记录了突然的垂直地面变形和100个地震的震群，M_（max）= 1.5，震中位于索尔法塔拉火山口下方。He的同位素组成， Ne，Ar和C（来自CO_2）以及He，Ne，Ar，H_2，CH_4和N_2的丰度已从Solfatara火山口收集的富马酸流体中进行了分析。为了记录这些同位素比值，虽然没有报道过用氦同位素比值来解释火山动荡的几种情况，但它们并未被用作地震的先兆。所有分析的同位素比，化学物质和计算得出的平衡温度在地震活动和地面变形发生的几个月前都发生了显着变化，随后突然返回到群之前记录的值。伴随着表层大气成分的减少，向着与地壳和岩浆源有关的深（热）气相表面的迁移是这种广泛变化的原因。

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