{"title":"3-D model reveals thermal decomposition as a potential driver of seismicity in the Apennines, Italy","authors":"Thanushika Gunatilake, Stephen A. Miller","doi":"10.1130/b37234.1","DOIUrl":null,"url":null,"abstract":"Earthquakes in the Central Apennines of Italy generate extensive aftershock sequences, with high-pressure CO2 often implicated as an important contributor to seismogenesis. Fluid pressure diffusion (through porous media) of mantle-derived high-pressure CO2 trapped in reservoirs is assumed to drive these sequences, yet seismic evidence of diffusion fronts remains elusive. We show here that co-seismic thermal decomposition also imposes numerous additional and isolated high fluid pressure sources that diffuse to drive the aftershock sequences. Numerical simulations mimic the generation of thermally decomposed fluids and reproduce the 2009 L’Aquila Mw 6.3 and the 2016 Amatrice-Visso-Norcia Mw 6.5 earthquake sequences. We identify hydraulic barriers and a minimum magnitude (Mw > 4) for thermal decomposition, which generate significant aftershock sequences in carbonates. The implications of thermal decomposition in seismogenesis are far-reaching and can be applied to any system, such as within subduction zones.","PeriodicalId":3,"journal":{"name":"ACS Applied Electronic Materials","volume":" 1","pages":""},"PeriodicalIF":4.3000,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"ACS Applied Electronic Materials","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1130/b37234.1","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
引用次数: 0
Abstract
Earthquakes in the Central Apennines of Italy generate extensive aftershock sequences, with high-pressure CO2 often implicated as an important contributor to seismogenesis. Fluid pressure diffusion (through porous media) of mantle-derived high-pressure CO2 trapped in reservoirs is assumed to drive these sequences, yet seismic evidence of diffusion fronts remains elusive. We show here that co-seismic thermal decomposition also imposes numerous additional and isolated high fluid pressure sources that diffuse to drive the aftershock sequences. Numerical simulations mimic the generation of thermally decomposed fluids and reproduce the 2009 L’Aquila Mw 6.3 and the 2016 Amatrice-Visso-Norcia Mw 6.5 earthquake sequences. We identify hydraulic barriers and a minimum magnitude (Mw > 4) for thermal decomposition, which generate significant aftershock sequences in carbonates. The implications of thermal decomposition in seismogenesis are far-reaching and can be applied to any system, such as within subduction zones.
期刊介绍:
ACS Applied Electronic Materials is an interdisciplinary journal publishing original research covering all aspects of electronic materials. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials science, engineering, optics, physics, and chemistry into important applications of electronic materials. Sample research topics that span the journal's scope are inorganic, organic, ionic and polymeric materials with properties that include conducting, semiconducting, superconducting, insulating, dielectric, magnetic, optoelectronic, piezoelectric, ferroelectric and thermoelectric.
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