今週のうなぎセミナーについてお知らせいたします。

Here is information of the Unagi-seminar(April, 25).

************** Seminar on Seismology IV A, C /地震学ゼミナールIV A, 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：2024年 4月 25日 (木) 13:30~
場所：京都大学 防災研究所 本館E-232D

Date and Time：2024-04-25, 13:30~
Place：Uji Campus Main Building E232D

---------- ---------- ---------- ----------

Speaker（発表者）:　Ketzallina Flores

Title（題目）:　Review of scaled energy near to Mexican Subduction Zone

Abstract（要旨）:
Subduction zones are regions where one plate slides beneath another. This phenomenon generates host a whole suite of earthquakes: interplate, tsunami, intraplate, and deep earthquakes. The different types of subduction zone earthquakes have differences in the frequency content of the seismic energy released [Venkataraman and Kanamori, 2004]. For example, tsunami earthquakes [Kanamori, 1972; Polet and Kanamori, 2000] occur in the shallow portions of the subduction zone. Despite their seismological similarities in these tsunami earthquakes, there is, however, no commonly accepted model with the structural or morphological conditions around these faults, which are conducive to large tsunamis with no strong ground motion.
Newman and Okal (1998) demonstrated that the scaled energy (ES/M0) calculated observed waveform is one of the powerful discriminants for tsunami earthquakes. Tsunami earthquakes typically show the scaled energy from 7×10^(-7) to 3×10^(-6) (Venkataraman and Kanamori, 2004). For instance, the scaled energies were calculated as 1.5×10^(-6), 0.6×10^(-6) and 2.6×10^(-6) for the recent tsunami earthquakes of Nicaragua (2 September 1992, MW 7.6), Java (2 June 1994, MW 7.8), and Peru (21 February 1996, MW 7.5), respectively (Venkataraman, 2002). The scaled energy is controlled by static and dynamic source process which may vary for different tectonic environments (IzutaniI and Kanamori, 2001).
We calculated scaled energy (ES/M0) of 30 earthquakes with MW more than 6 in the Mexican subduction zone. At the moment, we have found earthquake with similar scaled energy than tsunami earthquakes. There are events with anomalous scaled energy relative of neighborhood.

---------- ---------- ---------- ----------