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Notizie di Esteri in tempo reale - Pag. 728Etna: studio,investimenti così il magma si fa strada verso la superficie di Ansa   01-08-2024 - 10:27 Link copiato #iubenda-cs-banner .iub_ts_bc:not(.iubenda-custom-content) *,#iubenda-cs-banner [class*=" iub"],#iubenda-cs-banner [class^=iub],.iubenda-tp-btn:not([data-tp-nostyle]){ 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.iubenda-cs-opt-group button.ts_iub_btn_ok,#iubenda-cs-banner button.ts_iub_btn_cst{ background-color:#5f57a1!important;color:#fff!important}#iubenda-cs-banner .iubenda-cs-opt-group button.ts_iub_btn_rjct{ background-color:#5f57a1}#iubenda-cs-banner .iubenda-cs-opt-group button.ts_iub_btn_mr{ margin-left:0!important;margin-right:auto!important}#iubenda-cs-banner .iubenda-cs-container,#iubenda-cs-banner.iubenda-cs-default .iubenda-cs-container{ height:auto!important;max-height:100%!important}#iubenda-cs-banner .iub_ts_rtnl{ display:flex;flex-direction:column;height:100%}#iubenda-cs-banner .iub_ts_bc{ height:100%!important;max-height:45vh!important}@media only screen and (min-width:1024px){ #iubenda-cs-banner .iub_ts_bc{ max-height:none!important}}@media (max-width:639px){ #iubenda-cs-banner .iubenda-cs-opt-group{ -webkit-box-orient:vertical!important;-webkit-box-direction:normal!important;-ms-flex-direction:column!important;flex-direction:column!important;margin:12px!important}#iubenda-cs-banner .iubenda-cs-opt-group-custom{ -webkit-box-ordinal-group:3;-ms-flex-order:2;order:2}#iubenda-cs-banner .iubenda-cs-opt-group-consent{ -webkit-box-ordinal-group:2;-ms-flex-order:1;order:1}#iubenda-cs-banner .iubenda-cs-opt-group button{ display:block;margin:6px 3px!important;padding:8px 24px!important;text-align:center!important;width:100%!important}#iubenda-cs-banner .iubenda-cs-opt-group button.ts_iub_btn_rjct{ order:2!important}#iubenda-cs-banner .iubenda-cs-opt-group button.ts_iub_btn_pr{ order:3!important}#iubenda-cs-banner .iubenda-cs-opt-group button.ts_iub_btn_ok{ order:1!important}} #speakup-player{ margin: 0 !important; max-width: none !important; min-height: 85px !important; padding-bottom: 25px !important; padding-top: 10px !important;}#speakup-player:empty::after{ align-items: center; background-color: #fff; border-radius: 0.5rem; box-shadow: 0 12px 24px rgba(0, 0, 0, 0.12); font-family: sans-serif; content: 'Loading...'; display: flex !important; font-size: 13px; font-weight: bold; line-height: 1; justify-content: center; min-height: 50px; text-transform: uppercase;}#speakup-player:empty{ display: block;} (ANSA) - CATANIA, 01 AGO - "Una regione profonda a bassavelocità delle onde sismiche, assimilabile a un volume crostalein cui risiedono i magmi" dell'Etna è stata individuata da unteam di ricercatori guidato dall'università di Padova, incollaborazione con l'Osservatorio etneo dell'Istituto nazionaledi geofisica e vulcanologia di Catania e l'ateneo di Leeds (GranBretagna). Lo studio, che è stato pubblicato sulla rivistascientifica Geophysical research letters, si è avvalso di unatecnica avanzata di tomografia sismica anisotropa, che considerala variabilità della velocità delle onde sismiche in base alladirezione di propagazione. Questo, secondo i ricercatori, ha"permesso di ottenere informazioni senza precedenti sullastruttura della crosta terrestre nella regione etnea esull'interazione tra tettonica e vulcanismo, evidenziando lepossibili vie attraverso le quali il magma si 'fa strada' versola superficie". L'indagine comprende un periodo di dieci anni,dal 2006 al 2016, durante il quale sono stati registrati oltre3.700 eventi sismici con magnitudo locale compresa tra 0.5 e4.3."La regione individuata - ricostruisce Marco FirettoCarlino, ricercatore dell'Ingv - è limitata da un volume ad altavelocità che immerge verso Nord-Ovest e che è espressione delprocesso di subduzione. Una zona di discontinuità, di possibileorigine tettonica, caratterizza il volume crostale sovrastantela zona di residenza dei magmi, e potrebbe rappresentare una viapreferenziale per il trasferimento del magma verso lasuperficie. Questi risultati fanno luce sull'interazione tratettonica e magmatismo all'Etna, fornendo una spiegazioneplausibile per la sua attività persistente".«Rispetto ai precedenti studi tomografici condottinell'area etnea - spiega Rosalia Lo Bue, prima autrice dellostudio, condotto nel ruolo di assegnista all'università diPadova, e oggi assegnista di ricerca all'Ingv di Catania -questa ricerca si distingue per l'utilizzo pionieristico, inambiente vulcanico, di tecniche di tomografia anisotropa»"La tomografia sismica - osserva Elisabetta Giampiccolo,ricercatrice dell'Ingv funziona - in maniera analoga allatomografia medica ma utilizza onde sismiche per esplorarel'interno della Terra. Tradizionalmente, la tomografia sismicaimpiega un approccio isotropo, che non considera la variabilitàdella velocità delle onde sismiche in base alla direzione dipropagazione". (ANSA).. di Ansa   01-08-2024 - 10:27 Link copiato Commenti Leggi la Netiquette

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