A5001493333- earthquake and tectonic studies
- High-pressure geophysics and materials
- Seismic Waves and Analysis
- Earthquake Detection and Analysis
- Seismology and Earthquake Studies
- Geophysics and Sensor Technology
- Geological and Geochemical Analysis
Seoul National University
2022-2024
Abstract We used local P and S waves, regional Lg waves to investigate the M w 4.9 Offshore Jeju Island earthquake, whose records show evidence of a complex rupture. This earthquake provides rare window understand seismogenesis moderate‐sized earthquakes on southern Korea–East China Sea continental shelf. computed relative source time functions (RSTFs) by aligning signals origin main its empirical Green's function (EGF) events, allowing us use them as differential times EGF pair. determined...
Abstract The Mw 4.9 Offshore Jeju Island, Korea, earthquake of 14 December 2021 is the most significant event that occurred close to young intraplate volcano on continental shelf south Korean Peninsula. About 185 small earthquakes during nine days following mainshock. We accurately located 39 events despite limited station azimuthal coverage. found mainshock ruptured along a ∼1.4 km long fault striking east–west (275°) and triggered two distinct clusters in north–northeast direction. pure...
ABSTRACT We identified the causative fault of 2022 Goesan, Korea, earthquake sequence based on precise relocation that revealed a 0.8 km-long plane striking east-southeast–west-northwest. The encompasses largest foreshock, mainshock, and majority aftershocks. orientation is consistent with left-lateral strike-slip motion along east-southeast (106°) nodal focal mechanism. Jogok system recently mapped in source area runs through mainshock epicenter strike motion, which suggests it likely Mw...
Abstract On 5 April 2024, an earthquake of magnitude 4.8 occurred in Tewksbury, New Jersey. It was the largest instrumentally recorded event since 1900 Jersey and southern York. Millions people around York City, ∼65 km east-northeast felt shaking from mainshock, but epicentral area experienced no known significant property damages. We determine focal mechanism, which is oblique faulting, retrieve Lg-wave relative source time functions (RSTFs) stations at regional distances to understand...
Abstract Oceanic intraplate earthquakes are closely associated with seafloor geologic features, such as knolls, fracture zones, and seamounts. However, this inference is often challenged by significant earthquake location uncertainties difficulties in detecting small earthquakes, largely owing to limited station coverage. In study, we used ocean-bottom seismometer data from the Oldest-1 array consisting of 12 sites, which part Pacific array, construct a one-year catalog for events on oldest...
ABSTRACT Two significant earthquakes of magnitude ML 4.6 and 4.5 occurred on 18 January 3 December 2021 in the central region Yellow Sea, respectively. The beneath Gunsan sedimentary basin at about 10 km depth with a strike-slip faulting mechanism nodal planes striking northwest–southeast (NW–SE) north-northeast–south-southwest (NNE–SSW). Despite lack close-by seismographic stations, we successfully utilized regional Lg-wave observations both coasts sea—the Korean peninsula east eastern...
2016년 9월 12일에 경주에서 발생한 모멘트 규모 5.5의 지진이 이후, 이와 관련된 공공 안전에 대한 관심이 증폭되었다. 국가 광역 지진관측망, 대학교에서 설치한 임시 그리고 경주지진 원인 단층 규명을 위한 경주 고밀도 광대역 지진관측망자료는 경주지진과 연관 단층의 특성을 파악하는데 효과적으로 이용되고 있다. 이러한 지진 관측 네트워크의 목적을 공유하며, 여진 지역에 약 200m 간격으로 69대의 저비용 3성분 지오폰을 선형으로 배열하여 자료를 획득하였다. 지오폰 선형 배열 관측망은 단층대에 거의 수직하게 배치되었으며, 2020년 11월 17일부터 12월 20일까지 한 달간 가동되었다.관측 자료에 대하여 간단한 필터링(2-100 Hz) 만으로 인근에서 국지지진의 P파와 S파를 뚜렷하게 확인할 수 있었다. 또한 가동 기간 동안 또는 원거리 지진의 신호를 분석하는데 이용할 있을 것으로 기대한다. 조밀한 자료는 경주지진의 본진 및 여진과 상세한 구조를 규명하는데 기여할