Few examples of EM methods applied to volcanoes and geotermal systems in north Chile Daniel Díaz Universidad de Chile
Few examples ofEMmethods applied tovolcanoes andgeotermalsystems innorth Chile
DanielDíazUniversidaddeChile
Inthisareaitwaspossibletoseehighvariationsinthetopography,wherefor15kminthehorizontaldirectionwehave2kmvariationintheverticaldirection,showingahighcontrastinthewestandeastsidesofthevolcanicchain,finallythisimportanttopographyinfluenceshowingamismatchinthedata,creatingtheneedtoconsiderthetopographyintheinversiontocorrectthat,consideringthisanormal conditionsinthefield,weperformedacriteriatodeterminatethediscretizationthehorizontaldirectionforcaseswithahightopographycontrast.Wenote2importantfeatures,
first:itwasnecessarytoperformthemostnegridunderthestations,inthiscaseweusealogarithmicincrease,whichstartunderthestationsandincreaseupwardsanddownward,creatingamorenegridunderit.Forthisweusethe3DGridprogramperformedbyNaser Meqbel.
Second:inthisresearchwehavedifferenceof2kminthehorizontaldirectionbetweenstations,thereforeitwasnopossiblemakethefirstconsiderationunderallstations,thenfordecidewherecreatethemostnegrid,itwasnecessaryconsidertheconductivityunderit,prioritizingafinergridunderthemostconductivitystationstoavoidoverlapinthesamediscretizationblock,becauselessresistivitygeneratelowerpenetrations(skindepth analysis).
Danielacápongoelcriteriofinalquesetomoparadefinirelanchodelagrilla(eseldelpaper)
Graficoquemuestracomomejoraeltipper,aumentandoeltamañodelagrilla,de13kmHasta155km
155kmenXeY 13kmenXeY
ElTatio– LaTortaGeothermalFieldElTatiogeyserfieldcontainsmorethan80activegeysers(8%oftheworld)andislargestinthesouthernhemisphere.ItislocatedinnorthernChileatanelevationof4200to4300m.Diverse thermalfeatureshavebeenreported,includinggeysers,springs,perpetualspouters,mudpools,mudvolcanoes,andfumaroles.ThefieldissituatedamongHoloceneandesiticstratovolcanoesanddomes(LaTorta),whichmightprovidetheheatforthegeothermalsystem,butnohistoricaleruptionsweredocumented.