The University of Tokyo · 지구·행성과학
마사나오 시노하라 교수의 연구실은 해저 지질학적 현상, 특히 지진 발생 메커니즘과 후진동 분포를 해저에서의 고해상도 관측을 통해 규명하는 데 초점을 맞추고 있습니다. 주로 해저 케이블에 내장된 분산형 음향 센싱(DAS) 기술과 해저 지진계(OBS)를 활용해 해양지역의 지진 활동을 정밀하게 관측하고 있으며, 특히 규모가 큰 지진(예: 2011년 동일본 대지진, 2007년 츄에츠우키 지진)의 기원과 분포를 해석하는 데 기여하고 있습니다. 연구는 해저에서의 고밀도 지진 관측과 전자기파 및 태양풍과의 상호작용에 대한 다중지점 측정을 포함해, 지구물리학적 현상의 종합적 이해를 목표로 합니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
Recently, the distributed acoustic sensing (DAS) measurement, which utilizes an optical fiber itself as a sensor, becomes popular for various fields and is being applied to seismic observations. The shortest spatial sampling of DAS observations reaches a few meters, and the total measurement distance becomes greater than 50 km. A high temporal sampling rate is achieved. Due to these characteristics, a DAS measurement allows for a dense seismic observation as a linear array. Applying a DAS measur
Abstract The Chuetsu-Oki Earthquake occurred on July 16, 2007. To understand the mechanism of earthquake generation, it is important to obtain a detailed seismic activity. Since the source region of the 2007 Chuetsu-oki Earthquake lies mainly offshore of Chuetsu region, a central part of Niigata Prefecture, it is difficult to estimate the geometry of faults using only the land seismic network data. A precise aftershock distribution is essential to determine the fault geometry of the mainshock. T
Peculiarities of daytime and nighttime Pi 2 pulsations at the dip equator are examined by using multipoint measurements from the 210° magnetic meridian (MM) magnetometer network. We found that during daytime the amplitude of Pi 2 pulsations at the dip equator is enhanced, and the phase lags ∼ 34° behind those at low‐latitude (magnetic latitude Φ = 19.5‐46.2°) stations. On the other hand, during nighttime the amplitude of Pi 2 pulsations at the dip equator is depressed, and the phase lags ∼ 18° b
The 2011 off the Pacific coast of Tohoku Earthquake occurred at the plate boundary between the Pacific plate and the landward plate on March 11, 2011, and had a magnitude of 9. Many aftershocks occurred following the mainshock. Obtaining a precise aftershock distribution is important for understanding the mechanism of earthquake generation. In order to study the aftershock activity of this event, we carried out extensive sea-floor aftershock observations using more than 100 ocean-bottom seismome
