Synchronization between tides and sustained oscillations of the hydrothermal system of Campi Flegrei (Italy)
Identifieur interne : 000311 ( Istex/Corpus ); précédent : 000310; suivant : 000312Synchronization between tides and sustained oscillations of the hydrothermal system of Campi Flegrei (Italy)
Auteurs : E. De Lauro ; S. De Martino ; M. Falanga ; S. PetrosinoSource :
- Geochemistry, Geophysics, Geosystems [ 1525-2027 ] ; 2013-08.
English descriptors
- KwdEn :
- Asb2, Average value, Azimuth, Azimuth time series, Azimuth values, Background signal, Bgng, Caldera, Campi, Campi flegrei, Campi flegrei caldera, Campi flegrei figure, Circular statistics, Different time scales, Diurnal modulation, Earth planet, Earth tides, Entire year, Erebus volcano, Faithful geyser, Falanga, Flegrei, Frequency band, Geophys, Hydrothermal, Hydrothermal system, Hydrothermal systems, Hydrothermal tremor, Important role, Incidence angle, Incidence angles, Independent component analysis, Italian peninsula, Local characteristics, Long records, Many authors, Martino, Microseismic noise, Morphostructural analysis, Ocean loading, Online issue, Oscillation, Periodic signal, Periodicity, Persistent oscillations, Petrosino, Polarization analysis, Polarization azimuth, Polarization azimuths, Polarization parameters, Polarization vector, Pozzuoli, Predominant components, Present analysis, Present work, Rayleigh criterion, Recent dynamics, Relative periodogram, Seismic, Seismic data, Seismic noise, Seismic recordings, Seismicity, Semidiurnal, Semidiurnal components, Shallower hydrothermal system, Slow variables, Solfatara, Solfatara volcano, Southern italy, Stromboli volcano, Synchronization, Temporal energy release, Tidal, Tidal constituents, Tidal modulation, Tidal periodicities, Tidal signals, Time evolution, Time scale, Time scales, Time series, Topographic effect, Tremor, Volcanic, Volcanic activity, Volcanic system, Volcano, Volcano seismology, Volcanol.
- Teeft :
- Asb2, Average value, Azimuth, Azimuth time series, Azimuth values, Background signal, Bgng, Caldera, Campi, Campi flegrei, Campi flegrei caldera, Campi flegrei figure, Circular statistics, Different time scales, Diurnal modulation, Earth planet, Earth tides, Entire year, Erebus volcano, Faithful geyser, Falanga, Flegrei, Frequency band, Geophys, Hydrothermal, Hydrothermal system, Hydrothermal systems, Hydrothermal tremor, Important role, Incidence angle, Incidence angles, Independent component analysis, Italian peninsula, Local characteristics, Long records, Many authors, Martino, Microseismic noise, Morphostructural analysis, Ocean loading, Online issue, Oscillation, Periodic signal, Periodicity, Persistent oscillations, Petrosino, Polarization analysis, Polarization azimuth, Polarization azimuths, Polarization parameters, Polarization vector, Pozzuoli, Predominant components, Present analysis, Present work, Rayleigh criterion, Recent dynamics, Relative periodogram, Seismic, Seismic data, Seismic noise, Seismic recordings, Seismicity, Semidiurnal, Semidiurnal components, Shallower hydrothermal system, Slow variables, Solfatara, Solfatara volcano, Southern italy, Stromboli volcano, Synchronization, Temporal energy release, Tidal, Tidal constituents, Tidal modulation, Tidal periodicities, Tidal signals, Time evolution, Time scale, Time scales, Time series, Topographic effect, Tremor, Volcanic, Volcanic activity, Volcanic system, Volcano, Volcano seismology, Volcanol.
Abstract
Long continuous seismic data recorded at five broadband seismic stations during 2006 at Campi Flegrei caldera have been analyzed. Introducing a coarse‐grained method, we evaluate the time evolution of amplitude and polarization of the seismic noise in the frequency band common to long‐period events. The series are modulated on tidal time scales: the root‐mean square is basically dominated by solar contribution, while the azimuth of the polarization vector shows lunar diurnal and semidiurnal constituents. In addition, we find that in the frequency band common to long‐period events the azimuths are polarized toward a specific area, suggesting that these persistent oscillations can be induced by the activity of the shallow geothermal reservoir.
Background seismic noise is a sustained polarized oscillations Persistent oscillations are induced by the upper hydrothermal system Lunar tidal modulation as marker of increased amount of fluids
Url:
DOI: 10.1002/ggge.20149
Links to Exploration step
ISTEX:F715E20A06066EAD110CF88E9052A8C9333E974FLe document en format XML
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system</term><term>Volcano</term><term>Volcano seismology</term><term>Volcanol</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract">Long continuous seismic data recorded at five broadband seismic stations during 2006 at Campi Flegrei caldera have been analyzed. Introducing a coarse‐grained method, we evaluate the time evolution of amplitude and polarization of the seismic noise in the frequency band common to long‐period events. The series are modulated on tidal time scales: the root‐mean square is basically dominated by solar contribution, while the azimuth of the polarization vector shows lunar diurnal and semidiurnal constituents. In addition, we find that in the frequency band common to long‐period events the azimuths are polarized toward a specific area, suggesting that these persistent oscillations can be induced by the activity of the shallow geothermal reservoir.</div><div type="abstract">Background seismic noise is a sustained polarized oscillations Persistent oscillations are induced by the upper hydrothermal system Lunar tidal modulation as marker of increased amount of fluids</div></front></TEI><istex><corpusName>wiley</corpusName><keywords><teeft><json:string>flegrei</json:string><json:string>campi</json:string><json:string>hydrothermal</json:string><json:string>caldera</json:string><json:string>geophys</json:string><json:string>campi flegrei</json:string><json:string>azimuth</json:string><json:string>campi flegrei caldera</json:string><json:string>seismic</json:string><json:string>tidal</json:string><json:string>falanga</json:string><json:string>martino</json:string><json:string>hydrothermal tremor</json:string><json:string>petrosino</json:string><json:string>solfatara</json:string><json:string>seismic noise</json:string><json:string>semidiurnal</json:string><json:string>seismicity</json:string><json:string>pozzuoli</json:string><json:string>bgng</json:string><json:string>synchronization</json:string><json:string>tidal constituents</json:string><json:string>time evolution</json:string><json:string>volcanol</json:string><json:string>asb2</json:string><json:string>hydrothermal system</json:string><json:string>frequency band</json:string><json:string>polarization parameters</json:string><json:string>volcano</json:string><json:string>periodicity</json:string><json:string>average value</json:string><json:string>time scales</json:string><json:string>polarization vector</json:string><json:string>online issue</json:string><json:string>hydrothermal systems</json:string><json:string>volcanic</json:string><json:string>semidiurnal components</json:string><json:string>earth planet</json:string><json:string>slow variables</json:string><json:string>shallower hydrothermal system</json:string><json:string>incidence angle</json:string><json:string>tidal modulation</json:string><json:string>seismic recordings</json:string><json:string>seismic data</json:string><json:string>time series</json:string><json:string>southern italy</json:string><json:string>entire year</json:string><json:string>earth tides</json:string><json:string>oscillation</json:string><json:string>tremor</json:string><json:string>present work</json:string><json:string>volcanic system</json:string><json:string>background signal</json:string><json:string>periodic signal</json:string><json:string>stromboli volcano</json:string><json:string>important role</json:string><json:string>tidal signals</json:string><json:string>solfatara volcano</json:string><json:string>morphostructural analysis</json:string><json:string>ocean loading</json:string><json:string>present analysis</json:string><json:string>temporal energy release</json:string><json:string>diurnal modulation</json:string><json:string>many authors</json:string><json:string>rayleigh criterion</json:string><json:string>campi flegrei figure</json:string><json:string>different time scales</json:string><json:string>volcano seismology</json:string><json:string>volcanic activity</json:string><json:string>time scale</json:string><json:string>circular statistics</json:string><json:string>incidence angles</json:string><json:string>relative periodogram</json:string><json:string>azimuth values</json:string><json:string>azimuth time series</json:string><json:string>tidal periodicities</json:string><json:string>polarization azimuths</json:string><json:string>topographic effect</json:string><json:string>polarization azimuth</json:string><json:string>predominant components</json:string><json:string>italian peninsula</json:string><json:string>faithful geyser</json:string><json:string>microseismic noise</json:string><json:string>long records</json:string><json:string>local characteristics</json:string><json:string>persistent oscillations</json:string><json:string>recent dynamics</json:string><json:string>independent component analysis</json:string><json:string>erebus volcano</json:string><json:string>polarization analysis</json:string></teeft></keywords><author><json:item><name>E. De Lauro</name><affiliations><json:string>Dipartimento di Ingegneria dell'Informazione, Ingegneria Elettrica e Matematica Applicata, Università di Salerno, Salerno, Fisciano, Italy</json:string></affiliations></json:item><json:item><name>S. De Martino</name><affiliations><json:string>Dipartimento di Ingegneria dell'Informazione, Ingegneria Elettrica e Matematica Applicata, Università di Salerno, Salerno, Fisciano, Italy</json:string><json:string>E-mail: demartino@sa.infn.it</json:string></affiliations></json:item><json:item><name>M. Falanga</name><affiliations><json:string>Dipartimento di Ingegneria dell'Informazione, Ingegneria Elettrica e Matematica Applicata, Università di Salerno, Salerno, Fisciano, Italy</json:string></affiliations></json:item><json:item><name>S. Petrosino</name><affiliations><json:string>Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Napoli—Osservatorio Vesuviano, Naples, Italy</json:string></affiliations></json:item></author><subject><json:item><lang><json:string>eng</json:string></lang><value>sustained hydrothermal tremor</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>Campi Flegrei Caldera</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>polarization analysis</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>tidal modulation</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>synchronization</value></json:item></subject><articleId><json:string>GGGE20149</json:string></articleId><language><json:string>eng</json:string></language><originalGenre><json:string>article</json:string></originalGenre><qualityIndicators><score>6.332</score><pdfVersion>1.3</pdfVersion><pdfPageSize>609.789 x 807.137 pts</pdfPageSize><refBibsNative>true</refBibsNative><abstractCharCount>751</abstractCharCount><pdfWordCount>5012</pdfWordCount><pdfCharCount>31537</pdfCharCount><pdfPageCount>10</pdfPageCount><abstractWordCount>111</abstractWordCount></qualityIndicators><title>Synchronization between tides and sustained oscillations of the hydrothermal system of Campi Flegrei (Italy)</title><genre><json:string>article</json:string></genre><host><title>Geochemistry, Geophysics, Geosystems</title><language><json:string>unknown</json:string></language><doi><json:string>10.1002/(ISSN)1525-2027</json:string></doi><issn><json:string>1525-2027</json:string></issn><eissn><json:string>1525-2027</json:string></eissn><publisherId><json:string>GGGE</json:string></publisherId><volume>14</volume><issue>8</issue><pages><first>2628</first><last>2637</last><total>10</total></pages><genre><json:string>journal</json:string></genre><subject><json:item><value>Seismology</value></json:item><json:item><value>Volcano seismology</value></json:item><json:item><value>Natural Hazards</value></json:item><json:item><value>Geological</value></json:item><json:item><value>Volcanology</value></json:item><json:item><value>Calderas</value></json:item><json:item><value>Volcano monitoring</value></json:item><json:item><value>Regular Article</value></json:item></subject></host><categories><wos><json:string>science</json:string><json:string>geochemistry & geophysics</json:string></wos><scienceMetrix></scienceMetrix></categories><publicationDate>2013</publicationDate><copyrightDate>2013</copyrightDate><doi><json:string>10.1002/ggge.20149</json:string></doi><id>F715E20A06066EAD110CF88E9052A8C9333E974F</id><score>1</score><fulltext><json:item><extension>pdf</extension><original>true</original><mimetype>application/pdf</mimetype><uri>https://api.istex.fr/document/F715E20A06066EAD110CF88E9052A8C9333E974F/fulltext/pdf</uri></json:item><json:item><extension>zip</extension><original>false</original><mimetype>application/zip</mimetype><uri>https://api.istex.fr/document/F715E20A06066EAD110CF88E9052A8C9333E974F/fulltext/zip</uri></json:item><istex:fulltextTEI uri="https://api.istex.fr/document/F715E20A06066EAD110CF88E9052A8C9333E974F/fulltext/tei"><teiHeader><fileDesc><titleStmt><title level="a" type="main">Synchronization between tides and sustained oscillations of the hydrothermal system of Campi Flegrei (Italy)</title></titleStmt><publicationStmt><publisher>Blackwell Publishing Ltd</publisher><availability><licence>©2013. 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All Rights Reserved.</licence></availability><date type="published" when="2013-08"></date></publicationStmt><notesStmt><note type="content-type" subtype="article" source="article" scheme="https://content-type.data.istex.fr/ark:/67375/XTP-6N5SZHKN-D">article</note><note type="publication-type" subtype="journal" scheme="https://publication-type.data.istex.fr/ark:/67375/JMC-0GLKJH51-B">journal</note></notesStmt><sourceDesc><biblStruct type="article"><analytic><title level="a" type="main">Synchronization between tides and sustained oscillations of the hydrothermal system of Campi Flegrei (Italy)</title><title level="a" type="short">Hydrothermal Tremor at Campi Flegrei</title><author xml:id="author-0000"><persName><forename type="first">E.</forename><surname>Lauro</surname></persName><affiliation><orgName>Dipartimento di Ingegneria dell'Informazione</orgName><orgName>Ingegneria Elettrica e Matematica Applicata, Università di Salerno</orgName><address><settlement type="city">Fisciano</settlement><region>Salerno</region><country key="IT">Italy</country></address></affiliation></author><author xml:id="author-0001" role="corresp"><persName><forename type="first">S.</forename><surname>Martino</surname></persName><affiliation><orgName>Dipartimento di Ingegneria dell'Informazione</orgName><orgName>Ingegneria Elettrica e Matematica Applicata, Università di Salerno</orgName><address><settlement type="city">Fisciano</settlement><region>Salerno</region><country key="IT">Italy</country></address></affiliation><affiliation>(demartino@sa.infn.it)</affiliation></author><author xml:id="author-0002"><persName><forename type="first">M.</forename><surname>Falanga</surname></persName><affiliation><orgName>Dipartimento di Ingegneria dell'Informazione</orgName><orgName>Ingegneria Elettrica e Matematica Applicata, Università di Salerno</orgName><address><settlement type="city">Fisciano</settlement><region>Salerno</region><country key="IT">Italy</country></address></affiliation></author><author xml:id="author-0003"><persName><forename type="first">S.</forename><surname>Petrosino</surname></persName><affiliation><orgName>Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Napoli—Osservatorio Vesuviano</orgName><address><settlement type="city">Naples</settlement><country key="IT">Italy</country></address></affiliation></author><idno type="istex">F715E20A06066EAD110CF88E9052A8C9333E974F</idno><idno type="DOI">10.1002/ggge.20149</idno><idno type="unit">GGGE20149</idno><idno type="toTypesetVersion">file:GGGE.GGGE20149.pdf</idno></analytic><monogr><title level="j" type="main">Geochemistry, Geophysics, Geosystems</title><title level="j" type="alt">GEOCHEMISTRY, GEOPHYSICS, GEOSYSTEMS</title><idno type="pISSN">1525-2027</idno><idno type="eISSN">1525-2027</idno><idno type="book-DOI">10.1002/(ISSN)1525-2027</idno><idno type="book-part-DOI">10.1002/ggge.v14.8</idno><idno type="product">GGGE</idno><imprint><biblScope unit="vol">14</biblScope><biblScope unit="issue">8</biblScope><biblScope unit="page" from="2628">2628</biblScope><biblScope unit="page" to="2637">2637</biblScope><biblScope unit="page-count">10</biblScope><date type="published" when="2013-08"></date></imprint></monogr></biblStruct></sourceDesc></fileDesc><profileDesc><abstract style="main"><p>Long continuous seismic data recorded at five broadband seismic stations during 2006 at Campi Flegrei caldera have been analyzed. Introducing a coarse‐grained method, we evaluate the time evolution of amplitude and polarization of the seismic noise in the frequency band common to long‐period events. The series are modulated on tidal time scales: the root‐mean square is basically dominated by solar contribution, while the azimuth of the polarization vector shows lunar diurnal and semidiurnal constituents. In addition, we find that in the frequency band common to long‐period events the azimuths are polarized toward a specific area, suggesting that these persistent oscillations can be induced by the activity of the shallow geothermal reservoir.</p></abstract><abstract style="short"><head>Key Points</head><p><list style="bulleted"><item>Background seismic noise is a sustained polarized oscillations</item><item>Persistent oscillations are induced by the upper hydrothermal system</item><item>Lunar tidal modulation as marker of increased amount of fluids</item></list></p></abstract><textClass><keywords><term xml:id="ggge20149-kwd-0001">sustained hydrothermal tremor</term><term xml:id="ggge20149-kwd-0002">Campi Flegrei Caldera</term><term xml:id="ggge20149-kwd-0003">polarization analysis</term><term xml:id="ggge20149-kwd-0004">tidal modulation</term><term xml:id="ggge20149-kwd-0005">synchronization</term></keywords><classCode scheme="http://psi.agu.org/taxonomy5/7200">Seismology</classCode><classCode scheme="http://psi.agu.org/taxonomy5/4300">Natural Hazards</classCode><classCode scheme="http://psi.agu.org/taxonomy5/8400">Volcanology</classCode><classCode scheme="articleCategory">Regular Article</classCode><classCode scheme="tocHeading1">Regular Articles</classCode></textClass><langUsage><language ident="EN"></language></langUsage></profileDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/F715E20A06066EAD110CF88E9052A8C9333E974F/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Wiley, elements deleted: body"><istex:xmlDeclaration>version="1.0" encoding="UTF-8" standalone="yes"</istex:xmlDeclaration><istex:document><component version="2.0" type="serialArticle" xml:lang="en" xml:id="ggge20149"><header><publicationMeta level="product"><doi origin="wiley" registered="yes">10.1002/(ISSN)1525-2027</doi><issn type="print">1525-2027</issn><issn type="electronic">1525-2027</issn><idGroup><id type="product" value="GGGE"></id></idGroup><titleGroup><title type="main" sort="GEOCHEMISTRY, GEOPHYSICS, GEOSYSTEMS">Geochemistry, Geophysics, Geosystems</title><title type="short">Geochem. Geophys. Geosyst.</title></titleGroup></publicationMeta><publicationMeta level="part" position="80"><doi>10.1002/ggge.v14.8</doi><copyright ownership="thirdParty">©2013. American Geophysical Union. All Rights Reserved.</copyright><numberingGroup><numbering type="journalVolume" number="14">14</numbering><numbering type="journalIssue">8</numbering></numberingGroup><coverDate startDate="2013-08">August 2013</coverDate></publicationMeta><publicationMeta level="unit" position="50" type="article" status="forIssue"><doi>10.1002/ggge.20149</doi><idGroup><id type="unit" value="GGGE20149"></id></idGroup><countGroup><count type="pageTotal" number="10"></count></countGroup><titleGroup><title type="articleCategory">Regular Article</title><title type="tocHeading1">Regular Articles</title></titleGroup><copyright ownership="thirdParty">©2013. American Geophysical Union. All Rights Reserved.</copyright><eventGroup><event type="manuscriptReceived" date="2012-12-12"></event><event type="manuscriptRevised" date="2013-04-03"></event><event type="manuscriptAccepted" date="2013-04-12"></event><event type="xmlCreated" agent="Cenveo Publisher Services" date="2013-05-10"></event><event type="xmlConverted" agent="Converter:WILEY_ML3G_TO_WILEY_ML3GV2 version:3.3.1 mode:FullText" date="2014-05-06"></event><event type="publishedOnlineAccepted" date="2013-06-12"></event><event type="publishedOnlineEarlyUnpaginated" date="2013-08-02"></event><event type="publishedOnlineFinalForm" date="2013-09-24"></event><event type="firstOnline" date="2013-08-02"></event><event type="xmlConverted" agent="Converter:WML3G_To_WML3G version:4.6.4 mode:FullText" date="2015-10-01"></event></eventGroup><numberingGroup><numbering type="pageFirst">2628</numbering><numbering type="pageLast">2637</numbering></numberingGroup><correspondenceTo>(<email>demartino@sa.infn.it</email>)</correspondenceTo><subjectInfo><subject href="http://psi.agu.org/taxonomy5/7200">Seismology</subject><subjectInfo><subject href="http://psi.agu.org/taxonomy5/7280">Volcano seismology</subject></subjectInfo><subject role="crossTerm" href="http://psi.agu.org/taxonomy5/4300">Natural Hazards</subject><subjectInfo><subject role="crossTerm" href="http://psi.agu.org/taxonomy5/4302">Geological</subject></subjectInfo><subject href="http://psi.agu.org/taxonomy5/8400">Volcanology</subject><subjectInfo><subject href="http://psi.agu.org/taxonomy5/8440">Calderas</subject><subject role="crossTerm" href="http://psi.agu.org/taxonomy5/8419">Volcano monitoring</subject></subjectInfo></subjectInfo><selfCitationGroup><citation xml:id="ggge20149-cit-0049" type="self"><author><familyName>De Lauro</familyName>, <givenNames>E.</givenNames></author>,
<author><givenNames>S.</givenNames> <familyNamePrefix>De</familyNamePrefix><familyName>Martino</familyName></author>,
<author><givenNames>M.</givenNames> <familyName>Falanga</familyName></author>, and
<author><givenNames>S.</givenNames> <familyName>Petrosino</familyName></author> (<pubYear year="2013">2013</pubYear>), <articleTitle>Synchronization between tides and sustained oscillations of the hydrothermal system of Campi Flegrei (Italy)</articleTitle>, <journalTitle>Geochem. Geophys. Geosyst.</journalTitle>, <vol>14</vol>, 2628–2637, doi:<accessionId ref="info:doi/10.1002/ggge.20149">10.1002/ggge.20149</accessionId>.
</citation></selfCitationGroup><linkGroup><link type="toTypesetVersion" href="file:GGGE.GGGE20149.pdf"></link></linkGroup></publicationMeta><contentMeta><countGroup><count type="wordTotal" number="6271"></count><count type="tableTotal" number="1"></count><count type="figureTotal" number="5"></count></countGroup><titleGroup><title type="main">Synchronization between tides and sustained oscillations of the hydrothermal system of Campi Flegrei (Italy)</title><title type="short">Hydrothermal Tremor at Campi Flegrei</title><title type="shortAuthors">De lauro et al.</title></titleGroup><creators><creator affiliationRef="#ggge20149-aff-0001" creatorRole="author" xml:id="ggge20149-cr-0001"><personName><givenNames>E.</givenNames><familyNamePrefix>De</familyNamePrefix><familyName>Lauro</familyName></personName></creator><creator affiliationRef="#ggge20149-aff-0001" corresponding="yes" creatorRole="author" xml:id="ggge20149-cr-0002"><personName><givenNames>S.</givenNames><familyNamePrefix>De</familyNamePrefix><familyName>Martino</familyName></personName></creator><creator affiliationRef="#ggge20149-aff-0001" creatorRole="author" xml:id="ggge20149-cr-0003"><personName><givenNames>M.</givenNames><familyName>Falanga</familyName></personName></creator><creator affiliationRef="#ggge20149-aff-0002" creatorRole="author" xml:id="ggge20149-cr-0004"><personName><givenNames>S.</givenNames><familyName>Petrosino</familyName></personName></creator></creators><affiliationGroup><affiliation countryCode="IT" type="organization" xml:id="ggge20149-aff-0001"><orgDiv>Dipartimento di Ingegneria dell'Informazione</orgDiv><orgName>Ingegneria Elettrica e Matematica Applicata, Università di Salerno</orgName><address><city>Fisciano</city><countryPart>Salerno</countryPart><country>Italy</country></address></affiliation><affiliation countryCode="IT" type="organization" xml:id="ggge20149-aff-0002"><orgName>Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Napoli—Osservatorio Vesuviano</orgName><address><city>Naples</city><country>Italy</country></address></affiliation></affiliationGroup><keywordGroup type="author"><keyword xml:id="ggge20149-kwd-0001">sustained hydrothermal tremor</keyword><keyword xml:id="ggge20149-kwd-0002">Campi Flegrei Caldera</keyword><keyword xml:id="ggge20149-kwd-0003">polarization analysis</keyword><keyword xml:id="ggge20149-kwd-0004">tidal modulation</keyword><keyword xml:id="ggge20149-kwd-0005">synchronization</keyword></keywordGroup><abstractGroup><abstract type="main"><p label="1">Long continuous seismic data recorded at five broadband seismic stations during 2006 at Campi Flegrei caldera have been analyzed. Introducing a coarse‐grained method, we evaluate the time evolution of amplitude and polarization of the seismic noise in the frequency band common to long‐period events. The series are modulated on tidal time scales: the root‐mean square is basically dominated by solar contribution, while the azimuth of the polarization vector shows lunar diurnal and semidiurnal constituents. In addition, we find that in the frequency band common to long‐period events the azimuths are polarized toward a specific area, suggesting that these persistent oscillations can be induced by the activity of the shallow geothermal reservoir.</p></abstract><abstract type="short"><title type="main">Key Points</title><p><list style="bulleted"><listItem>Background seismic noise is a sustained polarized oscillations</listItem><listItem>Persistent oscillations are induced by the upper hydrothermal system</listItem><listItem>Lunar tidal modulation as marker of increased amount of fluids</listItem></list></p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Synchronization between tides and sustained oscillations of the hydrothermal system of Campi Flegrei (Italy)</title></titleInfo><titleInfo type="abbreviated" lang="en"><title>Hydrothermal Tremor at Campi Flegrei</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Synchronization between tides and sustained oscillations of the hydrothermal system of Campi Flegrei (Italy)</title></titleInfo><name type="personal"><namePart type="given">E.</namePart><namePart type="family">De Lauro</namePart><affiliation>Dipartimento di Ingegneria dell'Informazione, Ingegneria Elettrica e Matematica Applicata, Università di Salerno, Salerno, Fisciano, Italy</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">S.</namePart><namePart type="family">De Martino</namePart><affiliation>Dipartimento di Ingegneria dell'Informazione, Ingegneria Elettrica e Matematica Applicata, Università di Salerno, Salerno, Fisciano, Italy</affiliation><affiliation>E-mail: demartino@sa.infn.it</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">M.</namePart><namePart type="family">Falanga</namePart><affiliation>Dipartimento di Ingegneria dell'Informazione, Ingegneria Elettrica e Matematica Applicata, Università di Salerno, Salerno, Fisciano, Italy</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">S.</namePart><namePart type="family">Petrosino</namePart><affiliation>Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Napoli—Osservatorio Vesuviano, Naples, Italy</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="article" displayLabel="article"></genre><originInfo><publisher>Blackwell Publishing Ltd</publisher><dateIssued encoding="w3cdtf">2013-08</dateIssued><dateCreated encoding="w3cdtf">2013-05-10</dateCreated><dateCaptured encoding="w3cdtf">2012-12-12</dateCaptured><dateValid encoding="w3cdtf">2013-04-12</dateValid><edition>De Lauro, E., S. DeMartino, M. Falanga, and S. Petrosino (2013), Synchronization between tides and sustained oscillations of the hydrothermal system of Campi Flegrei (Italy), Geochem. Geophys. Geosyst., 14, 2628–2637, doi:10.1002/ggge.20149.</edition><copyrightDate encoding="w3cdtf">2013</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType><extent unit="figures">5</extent><extent unit="tables">1</extent><extent unit="words">6271</extent></physicalDescription><abstract>Long continuous seismic data recorded at five broadband seismic stations during 2006 at Campi Flegrei caldera have been analyzed. Introducing a coarse‐grained method, we evaluate the time evolution of amplitude and polarization of the seismic noise in the frequency band common to long‐period events. The series are modulated on tidal time scales: the root‐mean square is basically dominated by solar contribution, while the azimuth of the polarization vector shows lunar diurnal and semidiurnal constituents. In addition, we find that in the frequency band common to long‐period events the azimuths are polarized toward a specific area, suggesting that these persistent oscillations can be induced by the activity of the shallow geothermal reservoir.</abstract><abstract type="short">Background seismic noise is a sustained polarized oscillations Persistent oscillations are induced by the upper hydrothermal system Lunar tidal modulation as marker of increased amount of fluids</abstract><subject><genre>keywords</genre><topic>sustained hydrothermal tremor</topic><topic>Campi Flegrei Caldera</topic><topic>polarization analysis</topic><topic>tidal modulation</topic><topic>synchronization</topic></subject><relatedItem type="host"><titleInfo><title>Geochemistry, Geophysics, Geosystems</title></titleInfo><titleInfo type="abbreviated"><title>Geochem. Geophys. 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