今週のうなぎセミナーについてお知らせいたします。
出席者は以下のいずれかを選択できます。
・対面型：防災研究所連携研究棟301で参加 （十分に広い部屋です）
・オンライン型：zoomに接続参加 （対面型ゼミのオンライン配信に参加します）

Here is information of the Unagi-seminar(Apr 15).
During this semester, the seminar will be a hybrid one. You can either come to the seminar room for face-to-face interaction or join via zoom, whichever is more convenient for you.

************** Seminar on Seismology IV A,C /地震学ゼミナールIVＡ,C (Unagi Seminar) **************

科目：地震学ゼミナールIV A, C / Seminar on Seismology IV A, C（修士・博士）
日時 : 2021年 04月 15日 (木) 14:00~
場所 : 京都大学防災研究所　連携研究棟301号室（大セミナー室）または オンライン(Zoom)
https://www.kyoto-u.ac.jp/ja/access/campus/map6r-uji
（宇治キャンパス構内マップの77番の建物）

Date and Time: 2021-04-15, 14:00~
Place: Room No. #301, Collaborative Research Hub, DPRI, Building 77 in the map or Zoom (Hybrid)
https://www.kyoto-u.ac.jp/ja/access/campus/map6r-uji

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Presenter 1 (発表者 1): 大野 遼太 (Ohno Ryota)
Title (題目):
自己紹介 (Self-Introduction)
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Presenter 2 (発表者 2): 西沢 貴志 (Nishizawa Takashi)
Title (題目):
自己紹介 (Self-Introduction)
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Presenter 3 (発表者 3): 野末　陽平 (Nozue Yohei)
Title (題目):
自己紹介 (Self-Introduction)
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Presenter 4 (発表者 4): Raymundo Plata-Martinez
Title (題目):
Focal mechanism and radiated energy from shallow tremors in the Guerrero seismic gap.
Abstract (要旨):
Thanks to the recent development of offshore seismic networks, shallow slow earthquakes have been reported at the Guerrero seismic gap at the Mexican subduction zone. In Guerrero, a good understanding of deep slow earthquakes has already been acquired, on the contrary, shallow slow earthquakes have been scarcely explored. We analyzed a catalog of shallow tremors in the Guerrero seismic gap to estimate source parameters, such as focal mechanisms and radiated seismic energy. First we estimated the horizontal orientation of OBS and evaluated the quality and limitations of the recorded data with ambient noise. We also attempted to quantify attenuation and site effects from the marine environment, which needs to be understood to unmask source properties of seismic events recorded. Focal mechanism of shallow tremors and regular earthquakes tend to follow the subducting plate motion with a low thrust angle. Additionally, spectrums were corrected to remove site effect and attenuation for the tremor frequency range. By removing these two effects, source spectrum of shallow tremors are available for comparison with regular earthquakes in the region. Describing shallow tremors in the Guerrero the seismic gap will bring a new perspective of the seismic behavior of the Guerrero seismic gap.

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