1:45 PM - 2:00 PM
[SSS32-01] A crustal deformation model around the Izu Peninsula considering inland faults and elastic collision
Keywords:elastic collision, inland fault, plate subduction, volcanic inflation, Izu collisional zone, crustal deformation
The inversion result exhibits that elastic collisional power sources work at -12.7 mm/yr on the eastern foot of Mt. Hakone, 6.2 mm/yr on the northern foot, 11.6 mm/yr on the western foot and -0.5 mm/yr in the eastern Suruga bay. The plate boundaries are locked at 6 - 43.8 mm/yr beneath the Sagami trough, 3.6 - 39.3 mm/yr beneath the Suruga trough, 10 - 15.9 mm/yr in a southern edge of the Itoigawa Shizuoka Tectonic Line and 11 - 105.5 mm/yr on the boundary between the Izu micro plate and the Izu arc block. The inland faults creep at 23.3 mm/yr in deep extension of the Northern Izu fault zone and 23.4 mm/yr in deep extension of the Sagiriko Rokuroba fault group. In addition, the stationary volcanic deformation source at Mt. Mihara in the Izu-oshima island expands at 2.0×106 m3/yr. Furthermore, for the Honshu, the Izu mirco plate rotates at -3.1 °/Myr with the Euler pole of 36.57 °N, 139.72 °E and the Izu arc block rotates at -11.3 °/Myr with the Euler pole of 34.95 °N, 140.46 °E. The spatial variations of the elastic collisional power sourses correspond to actual terrain around the base of the Izu Peninsula.