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意大利亚平宁山脉10年的记录揭示了构造性二氧化碳地球脱气与地震活动之间的相关性。

Correlation between tectonic CO Earth degassing and seismicity is revealed by a 10-year record in the Apennines, Italy.

作者信息

Chiodini G, Cardellini C, Di Luccio F, Selva J, Frondini F, Caliro S, Rosiello A, Beddini G, Ventura G

机构信息

Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Bologna, via D. Creti 12, 40128 Bologna, Italy.

Dipartimento di Fisica e Geologia, Università degli Studi di Perugia, via Pascoli snc, 06123 Perugia, Italy.

出版信息

Sci Adv. 2020 Aug 26;6(35):eabc2938. doi: 10.1126/sciadv.abc2938. eCollection 2020 Aug.

DOI:10.1126/sciadv.abc2938
PMID:32923650
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7449681/
Abstract

Deep CO emissions characterize many nonvolcanic, seismically active regions worldwide, and the involvement of deep CO in the earthquake cycle is now generally recognized. However, no long-time records of such emissions have been published, and the temporal relations between earthquake occurrence and tectonic CO release remain enigmatic. Here, we report a 10-year record (2009-2018) of tectonic CO flux in the Apennines (Italy) during intense seismicity. The gas emission correlates with the evolution of the seismic sequences: Peaks in the deep CO flux are observed in periods of high seismicity and decays as the energy and number of earthquakes decrease. We propose that the evolution of seismicity is modulated by the ascent of CO accumulated in crustal reservoirs and originating from the melting of subducted carbonates. This large-scale, continuous process of CO production favors the formation of overpressurized CO-rich reservoirs potentially able to trigger earthquakes at crustal depth.

摘要

深层一氧化碳排放是全球许多非火山地震活跃地区的特征，目前人们普遍认识到深层一氧化碳参与了地震活动周期。然而，尚未发表过此类排放的长期记录，地震发生与构造性一氧化碳释放之间的时间关系仍然成谜。在此，我们报告了意大利亚平宁山脉在强烈地震活动期间（2009 - 2018年）十年的构造性一氧化碳通量记录。气体排放与地震序列的演变相关：在高地震活动期观察到深层一氧化碳通量峰值，随着地震能量和数量的减少而衰减。我们提出，地震活动的演变受到地壳储层中积累的、源自俯冲碳酸盐岩熔融的一氧化碳上升的调节。这种大规模、持续的一氧化碳生成过程有利于形成超压富含一氧化碳的储层，有可能在地壳深度引发地震。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/90bb/7449681/cb01082a86ef/abc2938-F5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/90bb/7449681/72ad201e4755/abc2938-F1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/90bb/7449681/c638338f872b/abc2938-F2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/90bb/7449681/d6c883073edd/abc2938-F4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/90bb/7449681/cb01082a86ef/abc2938-F5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/90bb/7449681/72ad201e4755/abc2938-F1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/90bb/7449681/c638338f872b/abc2938-F2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/90bb/7449681/d6c883073edd/abc2938-F4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/90bb/7449681/cb01082a86ef/abc2938-F5.jpg

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