Interplate earthquake: 1994 Sanriku (Ms 7.6) Nakayama & Takeo (1997)

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Presentation transcript:

Interplate earthquake: 1994 Sanriku (Ms 7.6) Nakayama & Takeo (1997)

Seno et al. (1993)

Recurrence intervals of great earthquakes Central Honshu 1923 Taisho Tokai, 1707, 1854 Kanto ∞ ~1500 ~400 1703 Genroku Izu ~1500 ~150 yrs ∞

Fault strength Tectonic stress Lithostatic pressure 3 km 30 km 100 MPa 1 GPA Lithostatic pressure 3 km 30 km Weakening Depth

Trench – Outer rise earthquakes Seno and Yamanaka (1996)

Age of the plate at the epicenter Tension Depth Compression Seno and Yamanaka (1996)

Intermediate-depth earthquakes: Northern Honshu Matsuzawa et al. (1988)

Dehydration instability: Serpentinite Raleigh & Paterson (1965)

Upper plate faulting types: Honshu - Kyushu Huzita (1980)

Tapponnier et al. (1982)

Accretion Suture zone Plate boundary Molnar (1984)