探秘活火山济州岛
<p> 探秘活火山济州岛 <span word="In">In</span> <span word="Jeju">Jeju</span>, <span word="Korea">Korea</span>, <span word="a">a</span> <span word="place">place</span> <span word="emerging">emerging</span> <span word="as">as</span> <span word="a">a</span> <span word="world">world</span>-<span word="famous">famous</span> <span word="vacation">vacation</span> <span word="spot">spot</span> <span word="with">with</span> <span word="natural">natural</span> <span word="tourism">tourism</span> <span word="resources">resources</span>, <span word="a">a</span> <span word="recent">recent</span> <span word="study">study</span> <span word="revealed">revealed</span> <span word="a">a</span> <span word="volcanic">volcanic</span> <span word="eruption">eruption</span> <span word="occurred">occurred</span> <span word="on">on</span> <span word="the">the</span> <span word="island">island</span>. <span word="The">The</span> <span word="Korea">Korea</span> <span word="Institute">Institute</span> <span word="of">of</span> <span word="Geoscience">Geoscience</span> <span word="and">and</span> <span word="Mineral">Mineral</span> <span word="Resources">Resources</span> <span word="indicated">indicated</span> <span word="that">that</span> <span word="there">there</span> <span word="are">are</span> <span word="the">the</span> <span word="traces">traces</span> <span word="that">that</span> <span word="indicated">indicated</span> <span word="that">that</span> <span word="a">a</span> <span word="recent">recent</span> <span word="volcanic">volcanic</span> <span word="eruption">eruption</span> <span word="was">was</span> <span word="evident">evident</span> 5,000 <span word="years">years</span> <span word="ago">ago</span>. <span word="This">This</span> <span word="is">is</span> <span word="the">the</span> <span word="first">first</span> <span word="time">time</span> <span word="the">the</span> <span word="date">date</span> <span word="of">of</span> <span word="the">the</span> <span word="explosion">explosion</span> <span word="has">has</span> <span word="been">been</span> <span word="made">made</span> <span word="clear">clear</span> <span word="in">in</span> <span word="the">the</span> <span word="region">region</span>. <span word="The">The</span> <span word="research">research</span> <span word="team">team</span> <span word="led">led</span> <span word="by">by</span> <span word="Dr">Dr</span>. <span word="Jin">Jin</span>-<span word="Young">Young</span> <span word="Lee">Lee</span> <span word="confirmed">confirmed</span> <span word="in">in</span> <span word="results">results</span> <span word="from">from</span> <span word="radiocarbon">radiocarbon</span> <span word="dating">dating</span> <span word="for">for</span> <span word="carbonized">carbonized</span> <span word="wood">wood</span> <span word="found">found</span> <span word="below">below</span> <span word="the">the</span> <span word="basaltic">basaltic</span> <span word="layer">layer</span> <span word="located">located</span> <span word="in">in</span> <span word="Sangchang">Sangchang</span>-<span word="ri">ri</span>, <span word="Seogwipo">Seogwipo</span>-<span word="si">si</span>, <span word="Jeju">Jeju</span>-<span word="do">do</span> <span word="it">it</span> <span word="dated">dated</span> <span word="back">back</span> <span word="to">to</span> 5,000 <span word="years">years</span> <span word="ago">ago</span>; <span word="which">which</span> <span word="means">means</span> <span word="the">the</span> <span word="time">time</span> <span word="when">when</span> <span word="the">the</span> <span word="basalt">basalt</span> <span word="on">on</span> <span word="the">the</span> <span word="upper">upper</span> <span word="layer">layer</span> <span word="was">was</span> <span word="formed">formed</span> <span word="took">took</span> <span word="place">place</span> <span word="relatively">relatively</span> <span word="recently">recently</span>, <span word="i">i</span>.<span word="e">e</span>. 5,000 <span word="years">years</span> <span word="ago">ago</span>, <span word="and">and</span> <span word="which">which</span> <span word="demonstrates">demonstrates</span> <span word="that">that</span> <span word="the">the</span> <span word="island">island</span> <span word="has">has</span> <span word="experienced">experienced</span> <span word="a">a</span> <span word="volcanic">volcanic</span> <span word="eruption">eruption</span> <span word="fairly">fairly</span> <span word="recently">recently</span>. <span word="The">The</span> <span word="latest">latest</span> <span word="volcanic">volcanic</span> <span word="eruption">eruption</span> <span word="occurring">occurring</span> <span word="on">on</span> <span word="Jeju">Jeju</span> <span word="Island">Island</span> <span word="was">was</span> <span word="volcanic">volcanic</span> <span word="activity">activity</span> <span word="known">known</span> <span word="to">to</span> <span word="have">have</span> <span word="spewed">spewed</span> <span word="around">around</span> 7,000 <span word="years">years</span> <span word="ago">ago</span> <span word="at">at</span> <span word="Mt">Mt</span>. <span word="Songak">Songak</span>. <span word="The">The</span> <span word="basaltic">basaltic</span> <span word="layer">layer</span> <span word="in">in</span> <span word="Sangchang">Sangchang</span>-<span word="ri">ri</span> <span word="is">is</span> <span word="known">known</span> <span word="to">to</span> <span word="be">be</span> <span word="formed">formed</span> <span word="due">due</span> <span word="to">to</span> <span word="the">the</span> <span word="eruption">eruption</span> <span word="in">in</span> <span word="the">the</span> <span word="vicinity">vicinity</span> <span word="of">of</span> <span word="Byeongak">Byeongak</span> <span word="Oreum">Oreum</span> 35,000 <span word="years">years</span> <span word="ago">ago</span>; <span word="though">though</span>, <span word="this">this</span> <span word="study">study</span> <span word="revealed">revealed</span> <span word="that">that</span> <span word="the">the</span> <span word="layer">layer</span> <span word="is">is</span> <span word="a">a</span> <span word="product">product</span> <span word="of">of</span> <span word="the">the</span> <span word="most">most</span> <span word="recent">recent</span> <span word="volcanic">volcanic</span> <span word="activity">activity</span> <span word="among">among</span> <span word="those">those</span> <span word="known">known</span> <span word="ever">ever</span>. <span word="Volcanic">Volcanic</span> <span word="activity">activity</span> <span word="at">at</span> <span word="Mt">Mt</span>. <span word="Songak">Songak</span> <span word="was">was</span> <span word="limited">limited</span> <span word="hydro">hydro</span> <span word="volcanic">volcanic</span> <span word="activity">activity</span> <span word="out">out</span> <span word="of">of</span> <span word="which">which</span> <span word="a">a</span> <span word="great">great</span> <span word="deal">deal</span> <span word="of">of</span> <span word="volcanic">volcanic</span> <span word="ash">ash</span> <span word="was">was</span> <span word="released">released</span> <span word="while">while</span> <span word="it">it</span> <span word="is">is</span> <span word="evident">evident</span> <span word="that">that</span> <span word="Sangchang">Sangchang</span>-<span word="ri">ri</span> <span word="was">was</span> <span word="a">a</span> <span word="dynamic">dynamic</span> <span word="active">active</span> <span word="volcano">volcano</span> <span word="out">out</span> <span word="of">of</span> <span word="which">which</span> <span word="lava">lava</span> <span word="was">was</span> <span word="spewed">spewed</span> <span word="and">and</span> <span word="then">then</span> <span word="flowed">flowed</span> <span word="down">down</span> <span word="in">in</span> <span word="all">all</span> <span word="directions">directions</span> <span word="along">along</span> <span word="the">the</span> <span word="inland">inland</span> <span word="slope">slope</span>. <span word="It">It</span> <span word="is">is</span> <span word="also">also</span> <span word="remarkable">remarkable</span> <span word="that">that</span> <span word="the">the</span> <span word="research">research</span> <span word="team">team</span> <span word="enhanced">enhanced</span> <span word="the">the</span> <span word="accuracy">accuracy</span> <span word="of">of</span> <span word="the">the</span> <span word="findings">findings</span> <span word="in">in</span> <span word="the">the</span> <span word="radiocarbon">radiocarbon</span> <span word="dating">dating</span> <span word="technique">technique</span> <span word="using">using</span> <span word="carbonized">carbonized</span> <span word="wood">wood</span>, <span word="consequently">consequently</span> <span word="raising">raising</span> <span word="the">the</span> <span word="reliability">reliability</span> <span word="of">of</span> <span word="the">the</span> <span word="findings">findings</span>. <span word="Until">Until</span> <span word="now">now</span>, <span word="previous">previous</span> <span word="research">research</span> <span word="used">used</span> <span word="the">the</span> <span word="dating">dating</span> <span word="method">method</span> <span word="for">for</span> <span word="rocks">rocks</span> <span word="covering">covering</span> <span word="the">the</span> <span word="upper">upper</span> <span word="sedimentary">sedimentary</span> <span word="layer">layer</span>, <span word="in">in</span> <span word="which">which</span> <span word="such">such</span> <span word="dating">dating</span> <span word="method">method</span> <span word="with">with</span> <span word="the">the</span> <span word="relatively">relatively</span> <span word="longer">longer</span> <span word="half">half</span>-<span word="life">life</span> <span word="period">period</span> <span word="shows">shows</span> <span word="limitations">limitations</span> <span word="in">in</span> <span word="determining">determining</span> <span word="the">the</span> <span word="time">time</span> <span word="the">the</span> <span word="basalt">basalt</span> <span word="was">was</span> <span word="formed">formed</span> <span word="about">about</span> 10,000 <span word="years">years</span> <span word="ago">ago</span>. <span word="In">In</span> <span word="order">order</span> <span word="to">to</span> <span word="overcome">overcome</span> <span word="the">the</span> <span word="limitations">limitations</span> <span word="of">of</span> <span word="the">the</span> <span word="dating">dating</span> <span word="method">method</span> <span word="for">for</span> <span word="the">the</span> <span word="rocks">rocks</span> <span word="covering">covering</span> <span word="the">the</span> <span word="upper">upper</span> <span word="sedimentary">sedimentary</span> <span word="layer">layer</span>, <span word="the">the</span> <span word="research">research</span> <span word="team">team</span> <span word="led">led</span> <span word="by">by</span> <span word="Dr">Dr</span>. <span word="Jin">Jin</span>-<span word="Young">Young</span> <span word="Lee">Lee</span> <span word="concurrently">concurrently</span> <span word="used">used</span> <span word="radiocarbon">radiocarbon</span> <span word="dating">dating</span> <span word="and">and</span> <span word="optically">optically</span> <span word="stimulated">stimulated</span> <span word="luminescence">luminescence</span> <span word="dating">dating</span> , <span word="using">using</span> <span word="such">such</span> <span word="cross">cross</span>-<span word="validation">validation</span> <span word="of">of</span> <span word="which">which</span> <span word="raised">raised</span> <span word="the">the</span> <span word="accuracy">accuracy</span> <span word="of">of</span> <span word="tracing">tracing</span> <span word="the">the</span> <span word="past">past</span> <span word="volcanic">volcanic</span> <span word="activities">activities</span>. <span word="Judging">Judging</span> <span word="from">from</span> <span word="the">the</span> <span word="findings">findings</span>, <span word="Jeju">Jeju</span> <span word="Island">Island</span> <span word="is">is</span> <span word="not">not</span> <span word="an">an</span> <span word="extinct">extinct</span> <span word="volcano">volcano</span>, <span word="but">but</span> <span word="seems">seems</span> <span word="to">to</span> <span word="rather">rather</span> <span word="be">be</span> <span word="a">a</span> <span word="potentially">potentially</span> <span word="live">live</span> <span word="volcano">volcano</span> <span word="because">because</span> <span word="a">a</span> <span word="volcano">volcano</span> <span word="that">that</span> <span word="has">has</span> <span word="erupted">erupted</span> <span word="within">within</span> 10,000 <span word="years">years</span> <span word="is">is</span> <span word="defined">defined</span> <span word="to">to</span> <span word="be">be</span> <span word="a">a</span> <span word="live">live</span> <span word="volcano">volcano</span> <span word="on">on</span> <span word="a">a</span> <span word="geological">geological</span> <span word="basis">basis</span>. <span word="Not">Not</span> <span word="remaining">remaining</span> <span word="complacent">complacent</span> <span word="for">for</span> <span word="the">the</span> <span word="findings">findings</span>, <span word="the">the</span> <span word="research">research</span> <span word="team">team</span> <span word="plans">plans</span> <span word="to">to</span> <span word="continuously">continuously</span> <span word="conduct">conduct</span> <span word="the">the</span> <span word="studies">studies</span> <span word="on">on</span> <span word="the">the</span> <span word="time">time</span> <span word="the">the</span> <span word="volcanic">volcanic</span> <span word="rocks">rocks</span> <span word="were">were</span> <span word="formed">formed</span> <span word="in">in</span> <span word="several">several</span> <span word="regions">regions</span> <span word="on">on</span> <span word="the">the</span> <span word="island">island</span> <span word="in">in</span> <span word="order">order</span> <span word="to">to</span> <span word="identify">identify</span> <span word="the">the</span> <span word="latest">latest</span> <span word="volcanic">volcanic</span> <span word="activity">activity</span>. </p>
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