11.4 The following shows ground motion recordings from two adjoining islands in the San Francisco Bay during the 1979 Loma Prieta earthquake. Treasure Island and Yerba Buena Island are both located at a distance of about 50 miles from the epicenter. Treasure Island was created in the 1930s by filling sand over underwater bay mud deposits, while Yerba Buena Island is a natural rock outcrop. The recordings showed a significant difference in amplification between the two adjacent sites. a Acceleration- 0.1 0.0 -0.1 0.1 0.0 -0.1 0 0 5 a) Which island has a soft soil condition? 10 10 15 15 Time-seconds 20 20 25 25 30 c) What was the approximate ratio of the peak ground acceleration at these sites? 30 b) Which recording was from Treasure Island and which one was from Yerba Buena Island? In other words, which site, soft soil or stiff rock, produced the larger shaking?

11.4 The following shows ground motion recordings from two adjoining islands in the San Francisco Bay during the 1979 Loma Prieta earthquake. Treasure Island and Yerba Buena Island are both located at a distance of about 50 miles from the epicenter. Treasure Island was created in the 1930s by filling sand over underwater bay mud deposits, while Yerba Buena Island is a natural rock outcrop. The recordings showed a significant difference in amplification between the two adjacent sites. a Acceleration- 0.1 0.0 -0.1 0.1 0.0 -0.1 0 0 5 a) Which island has a soft soil condition? 10 10 15 15 Time-seconds 20 20 25 25 30 c) What was the approximate ratio of the peak ground acceleration at these sites? 30 b) Which recording was from Treasure Island and which one was from Yerba Buena Island? In other words, which site, soft soil or stiff rock, produced the larger shaking?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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