한반도 지각구조로 인한 지반운동과 지진위험성

DC Field Value Language
dc.contributor.author 김광희 -
dc.contributor.author 강수영 -
dc.contributor.author 유해수 -
dc.contributor.author 석봉출 -
dc.date.accessioned 2020-07-17T03:30:21Z -
dc.date.available 2020-07-17T03:30:21Z -
dc.date.created 2020-02-11 -
dc.date.issued 2007-10-08 -
dc.identifier.uri https://sciwatch.kiost.ac.kr/handle/2020.kiost/30334 -
dc.description.abstract Seismic waves, in general, attenuate with distances they travel, so does the potential seismic hazard. Although damages due to large earthquakes are limited by distances within a few tens of kilometers from the source region, some areas far from the epicenter may experience strong shakings and severe damages. A moderate size earthquake with ML 4.8 occurred in the central eastern Korean Peninsula in the evening of January 20, 2007. The earthquake was the largest inland earthquake ever recorded since the modern Seismic Network has been fully operational in the peninsula and provided unprecedented opportunity to observe strong ground shakings throughout the country. At the closest station from the epicenter, 6.5%g, 13.2%g, 15.6%g were registered on the vertical, east-west, and north-south components, respectively. While the observed PGAs during the earthquake follow the general trend of exponential decay with the distance, some strong motion stations experienced several times larger ground shakings than those expected from the empirically determined attenuation relation. The observed strong ground shakings may be caused by site responses which amplify the wave in the thick basin, directivity due to the rupture processes, dipping crustal structures, a simple crustal structure lacking mid-continental discontinuities, or the combination of above mentioned. After the examination of several potential factors, we propose Moho-reflected S wave, SmS, to be responsible for the enhanced amplitude observed in the strong motion stations at the distance range from 80 to 180 km. Empirical PGA predictions may have underestimated strong ground motions in this distance range. Thus, Moho-reflections should be taken into consideration in the prediction of the strong ground motion and the evaluation of seismic hazard mitigation efforts. -
dc.description.uri 1 -
dc.language English -
dc.publisher 한국지질자원연구원 -
dc.relation.isPartOf 6th international seminar on seismic tomography of far-east and rlated works -
dc.title 한반도 지각구조로 인한 지반운동과 지진위험성 -
dc.title.alternative Enhanced Ground Motions and Seismic Hazards due to Crustal Structures in Korea -
dc.type Conference -
dc.citation.conferencePlace KO -
dc.citation.endPage 44 -
dc.citation.startPage 42 -
dc.citation.title 6th international seminar on seismic tomography of far-east and rlated works -
dc.identifier.bibliographicCitation 6th international seminar on seismic tomography of far-east and rlated works, pp.42 - 44 -
dc.description.journalClass 1 -
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