The interrogation squad led yesteryear MD Jin-Young Lee confirmed inwards results from radiocarbon dating for carbonized woods (charcoal) constitute below the basaltic layer located inwards Sangchang-ri, Seogwipo-si, Jeju-do it dated dorsum to 5,000 years ago; which agency the fourth dimension when the basalt on the upper layer was formed took house relatively recently, i.e. 5,000 years ago, as well as which demonstrates that the isle has experienced a volcanic eruption fairly recently.
The latest volcanic eruption occurring on Jeju Island was volcanic activeness known to bring spewed roughly 7,000 years agone at Mt. Songak. The basaltic layer inwards Sangchang-ri is known to survive formed due to the eruption inwards the vicinity of Byeongak Oreum 35,000 years ago; though, this written report revealed that the layer is a production of the most recent volcanic activeness amid those known ever. Volcanic activeness at Mt. Songak was express hydro volcanic activeness out of which a non bad bargain of volcanic ash was released spell it is evident that Sangchang-ri was a dynamic active volcano out of which lava was spewed as well as and then flowed downwards inwards all directions along the inland slope.
It is also remarkable that the interrogation squad enhanced the accuracy of the findings inwards the radiocarbon dating technique using carbonized wood, consequently raising the reliability of the findings. Until now, previous interrogation used the dating method for rocks roofing the upper sedimentary layer, inwards which such dating method amongst the relatively longer half-life stream shows limitations inwards determining the fourth dimension the basalt was formed close 10,000 years ago.
In guild to overcome the limitations of the dating method for the rocks roofing the upper sedimentary layer, the interrogation squad led yesteryear MD Jin-Young Lee concurrently used radiocarbon dating as well as optically stimulated luminescence dating (OSL), using such cross-validation of which raised the accuracy of tracing the yesteryear volcanic activities.
Judging from the findings, Jeju Island is non an extinct volcano, merely seems to rather survive a potentially alive volcano because a volcano that has erupted inside 10,000 years is defined to survive a alive volcano on a geological basis.
Not remaining complacent for the findings, the interrogation squad plans to continuously deport the studies on the fourth dimension the volcanic rocks were formed inwards several regions on the isle inwards guild to position the latest volcanic activity.
The higher upward even out is based on materials provided by Korea Institute of Geoscience as well as Mineral Resources (KIGAM). Note: Materials may survive edited for content as well as length.