<mods:mods xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-4.xsd"><mods:titleInfo><mods:title>Analysis of Gas Emission Periodicity for Turialba Volcano, Costa Rica</mods:title></mods:titleInfo><mods:abstract>I am using crater photos taken every second at Turrialba Volcano, Costa Rica, to study temporal variation of light scattering associated with the emission of water vapor from the volcano. Gas emission is often used as a potential proxy for magmatic activity and volcanic unrest. Here, we use this series of images to draw comparison about the periodicity of outgassing signals between and just prior to eruptions over January to April 2017. Preliminary results suggest that pre-eruption gas emissions have an abnormal increase in periodic emissions at around 100 seconds, when compared to background gas emission. This is important because eruption precursors could significantly help monitoring volcanoes and regulate access to or near the crater.</mods:abstract><mods:name type="personal"><mods:namePart>Blackstone, Laura</mods:namePart><mods:role><mods:roleTerm type="text">creator</mods:roleTerm></mods:role></mods:name><mods:name type="personal"><mods:namePart>Christian Huber</mods:namePart><mods:role><mods:roleTerm type="text">advisor</mods:roleTerm></mods:role><mods:affiliation>Brown University. Department of Earth, Environmental, and Planetary Sciences</mods:affiliation></mods:name><mods:name type="corporate"><mods:namePart>Brown University. Karen T. Romer Undergraduate Teaching and Research Awards</mods:namePart><mods:role><mods:roleTerm type="text">research program</mods:roleTerm></mods:role></mods:name><mods:subject authority="fast" authorityURI="http://id.worldcat.org/fast" valueURI="http://id.worldcat.org/fast/01168816"><mods:topic>Volcanic eruptions</mods:topic></mods:subject><mods:language><mods:languageTerm type="text" authority="iso639-2b">English</mods:languageTerm></mods:language><mods:typeOfResource>still image</mods:typeOfResource><mods:genre authority="aat">posters</mods:genre><mods:originInfo><mods:place><mods:placeTerm type="code" authority="marccountry">riu</mods:placeTerm></mods:place><mods:place><mods:placeTerm type="text">Providence, RI</mods:placeTerm></mods:place><mods:publisher>Brown University</mods:publisher><mods:dateCreated keyDate="yes" encoding="w3cdtf">2018</mods:dateCreated></mods:originInfo><mods:physicalDescription><mods:extent>1 poster</mods:extent><mods:digitalOrigin>born digital</mods:digitalOrigin></mods:physicalDescription><mods:identifier type="doi">10.26300/gw9d-3s35</mods:identifier></mods:mods>