[S07-P] Poster

[S07-P-11] Difference in Ground Motion and Seismic Source Characteristics Between the Surface and Buried Rupture Crustal Earthquake in Japan

^○Shohei Yoshida, Takao Kagawa, Tatsuya Noguchi (Tottori University, Tottori, Japan)

Appearance of surface fault rupture in inland crustal earthquake affects significantly on ground motion characteristic. Somerville (2003) has indicated that the observed ground motion from buried ruptures are larger than those from surface rupture earthquakes in the period between range 0.3 and 3 sec. Following researchers explain the differences by fault rupture processes analysis using kinematic and dynamic source models of several part earthquakes (e.g. Kagawa et al., 2004). In Japan, inland crustal earthquakes have occurred frequently after the 1995 Kobe earthquake, and some of them had surface fault ruptures (e.g. 2016 Kumamoto earthquake). Yoshida et al.(2016) evaluated ground motion characteristics of the inland crustal earthquakes in Japan using the similar method as Somerville (2003). As a result, ground motions from buried rupture earthquakes are twice larger than those from surface rupture earthquakes in period range between 0.1 and 0.4 sec. We will report difference in the seismic source characteristics between the surface and buried rupture earthquakes using kinematic source models in Japan and discuss the difference of dominant period range between the result by Somerville (2003) and Yoshida et al.(2016).

Somerville(2003): Physics of the Earth and Planetary Interiors, 137, 201-212.
Kagawa(2004): Earth Planets Space, 56, 3-14.
Yoshida et al.(2016): Japan Geoscience Union Meeting 2016 Abstract, SCG061-P03.(in Japanese with English Abstract)