Boulders displaced by the 1984 Western Nagano Prefecture Earthquake (MJMA=6.8) were investigated mainly in the eastern part of the source region which had not been fully surveyed. It was found that numerous boulders were displaced over the large extent of the eastern part of the source region. It is inferred that the boulders were not displaced by high-frequency seismic waves with frequencies between 5-10 Hz, but by low-frequency seismic waves of about 1 Hz, which radiated from the smooth dislocation on the fault plane. The boulder which experienced the largest ground motions was discovered in the eastern part. The ground motions estimated from the displacement of the boulder have a velocity of 5.5 m/s and an acceleration of 3.5 g in the vertical direction, and a velocity of 3.2 m/s and an acceleration of 2.0 g in the horizontal direction.
This presentation introduces the case study of reservoir characterization in the offshore oil field. This field is in a dome approximately 7km wide, superimposed on anticlinal structure. The two Jurassic zones comprise the main oil reservoirs in the field. The formation of these reservoirs consists mainly of carbonates, accompanied by subordinate anhydrite. The upper zone CA') is separated from the lower ('B ') by an anhydrite layer 20 feet thick. The objective here is to characterize a reservoir property of the zone 'A'. Three-Dimensional
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