English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Long-term geochemical monitoring performed in the seismic area of the Umbria-Marche region of Italy (i.e. Central&#13; Apennines) has allowed us to create a model of the circulation of fluids and interpret the temporal chemical&#13; and isotopic variations of both the thermal springs as well as the gas vents. Coincident with the last seismic crisis,&#13; which struck the region in 1997-1998, an enhanced CO2 degassing on a regional scale caused a pH-drop in&#13; all the thermal waters as a consequence of CO2 dissolution. Furthermore, much higher 3He/4He isotope ratios&#13; pointed to a slight mantle-derived contribution. Radon activity increased to well above the ±2 sinterval of the earlier&#13; seismic period, after which it abruptly decreased to very low levels a few days before the occurrence of the&#13; single deep-located shock (March 26, 1998, 51 km deep). The anomalous CO2 discharge was closely related to&#13; the extensional movement of the normal faults responsible for the Mw 5.7, 6.0 and 5.6 main shocks that characterized&#13; the earlier seismic phase. In contrast, a clear compressive sign is recognizable in the transient disappearance&#13; of the deep-originating components related to the Mw 5.3, 51 km-deep event that occurred on March 26,&#13; 1998. Anomalies were detected concomitantly with the seismicity, although they also occurred after the seismic&#13; crisis had terminated. We argue that the observed geochemical anomalies were driven by rock permeability&#13; changes induced by crustal deformations, and we describe how, in the absence of any release of elastic energy, the&#13; detection of anomalies reveals that a seismogenic process is developing. Indeed, comprehensive, long-term geochemical&#13; monitoring can provide new tools allowing us to better understand the development of seismogenesis

Long-term geochemical monitoring and extensive/compressive phenomena: case study of the Umbria Region (Central Apennines, Italy)